The statement is False, when lead-209 undergoes beta decay. As the nuclear equation is n ---> p + e- + antineutrino.
Lead-209 is an atom that contains 82 protons and 127 neutrons in its nucleus, meaning that lead-209 is not a neutron. Neutrons are particles that are found in the nucleus of atoms and have no charge. Therefore, lead-209 can't undergo beta decay by emitting a neutron. Beta decay occurs when an unstable nucleus emits a beta particle and an antineutrino, changing the number of protons in the nucleus. The balanced nuclear equation for the beta decay of lead-209 would be Pb-209 (atomic number = 82) --> Bi-209 (atomic number = 83) + e- + antineutrino. The Bi-209 is a isotope of bismuth, which has one more proton than lead-209 and the same number of neutrons.
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Question-- Select True or False: When lead-209 undergoes beta decay the balanced nuclear equation for this reaction is: n ---> p + e- + antineutrino
Estimate how much heat in joules is released when 25. 0 g of water (C = 4. 184 J/g°C) is cooled from 80. 0°C to 30. 0°C?
The heat in joules is released when 25. 0 g of water (C = 4. 184 J/g°C) is cooled from 80. 0°C to 30. 0°C is -5210 J
To find the amount of heat released when a substance is cooled, we can use the equation:
q = mcΔT
where q is the amount of heat (in joules), m is the mass of the substance (in grams), c is the specific heat capacity of the substance (in joules per gram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).
Given the information in the question, we have:
m = 25.0 g
c = 4.184 J/g°C
ΔT = 30.0°C - 80.0°C = -50.0°C
So, we can substitute these values into the equation and get:
q = (25.0 g)(4.184 J/g°C)(-50.0°C)
q = -5210 J
Therefore, the amount of heat released when 25.0 g of water is cooled from 80.0°C to 30.0°C is -5210 J.
A negative sign means the heat is absorbed during the cooling process, it is an endothermic process.
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A sample of a substance was heated strongly in a crucible, and the sample increased in mass.
This is evidence that
A. A gas had been evolved.
B. The substance had melted.
C. The substance had sublimed.
D. A chemical change had taken place.
O E. A change of state had occurred.
When a sample of a substance was heated strongly in a crucible, the sample increased in mass. This is evidence that a chemical change has taken place.
In a closed system, when no heat or energy is applied, the mass of a substance will remain the same. But, when heated at high temperatures, the average kinetic energy of the particles of a substance increase due to which the particles will move faster, and collide with each other and take up more space. There will be transfer of energy due to application of heat. As a result of this the mass of the sample also increases.
Hence, option D is correct
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How many grams is 0.5 moles?
0.5 moles of carbon weigh 6.0055 grams.
One of the chemical elements is carbon. The letter C stands for carbon, and the letter g stands for grams. As a result, 0.5 moles of carbon per gram is equivalent to 0.5 moles of carbon per gram, 0.5 moles of carbon per gram, and 0.5 moles of C per gram.
Carbon has a 12.011 atomic mass. Thus, one mole of carbon has a mass of 12.011 grams (12.011 g/mol). We multiply 0.5 moles of carbon by 12.011 to get grams, and vice versa.
no. of Grams = Moles of Carbon x 12.011
=0.5 × 12.011 = 6.0055
0.5 moles of carbon equal 6.0055 grams.
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The complete question is
How many grams is 0.5 moles of carbon
If 6.4 g solid carbon dioxide were placed in the same container but it already contained air at 740 torr, what would be the partial pressure of carbon dioxide, PCO2
Given data
Mass of the piece of a solid carbon dioxide is m = 6.8 g
Volume of the solid carbon dioxide is V=4L
The temperature is T = 23°C = 296 K . The pressure of the air in the container is
740 Pho = 740 torr = atm 76
The temperature is T = 23 deg * C = 296K
The pressure of the air in the container is
Pho = 740 torr 740 760 atm
(a)The expression of ideal gas equation is given by,
PV = nRT
PV = (m/M) * RT
Where, P is the pressure in which the container after all the carbon dioxide is vaporizes.
M is the molar mass of the solid carbon dioxide (M = 44.01g / m * ol)
R is the universal gas constant R = (0.0832kJ / m * olK)
Substitute the all values in the above equation and calculate the value of pressure in which the container after all the carbon dioxide is vaporizes.
6.8 g 44.01 g/mol P(4L)= P= (0.0832 kJ/mol K) (296 K) (0.1545 mol) (0.0832 kJ/mol K) (296 K)
P = 0.951atm
(4L)Thus, the pressure in which the container after all the carbon dioxide is vaporizes is 0.951 atm.
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i need help asap now answer all blanks
Answer:
2
Explanation:
You want the coefficient of silver iodide in the equation ...
_AgI +_Na₂S ⇒ _Ag₂S +_NaI
Balanced equationThe equation is balanced when the numbers of each of the species is the same on each side of the equation.
We can write four equations in the four unknowns to find the coefficients, or we can use a little guesswork.
If we suppose the coefficient of silver sulfide (Ag₂S) is 1, that tells us the coefficient of silver iodide (AgI) will be 2. If that is the case, then there are two atoms of iodine that will make the coefficient of NaI be 2. This is consistent with the coefficient of Na₂S being 1, giving one Sulfur atom on each side of the equation.
The balanced equation is ...
2AgI +Na₂S ⇒ Ag₂S +2NaI
The coefficient of silver iodide is 2.
__
Additional comment
If the reaction is ...
a·AgI + b·Na₂S ⇒ c·Ag₂S + d·NaI
We can write the relationships between the coefficients as follows. This ultimately gives rise to 3 equations in 4 unknowns, so the choice of any given coefficient is arbitrary. We choose to use the smallest integers that satisfy the conditions.
The balance for Ag is ...
a = 2c
The balance for I is ...
a = d
The balance for Na is ...
2b = d
The balance for S is ...
b = c
Then, in terms of 'a' and 'b', we have ...
a = d = 2b = 2c
For b = c = 1, a = d = 2, as we determined above.
Which of the following characteristics are true about a typical peptide (amide) bond?
1) The bond is planar.
2) There is free rotation about the carbonyl carbon and nitrogen bond.
3) There is substantial double-bond character to this bond.
4) There is a net negative charge on nitrogen and net positive charge on oxygen.
O Only statements 1, 2, and 4 are correct.
O Only statements 1 and 3 are correct.
O Only statements 2 and 3 are correct.
O All of the listed statements are correct.
The correct answer is:Only statements 1 and 2 are correct.
1) The bond is planar.
2) There is free rotation about the carbonyl carbon and nitrogen bond.
The bond is planar: True, Peptide bond is a planar bond because it is composed of a double bond between the carbonyl carbon and nitrogen, and the atoms on either side of the double bond are sp2 hybridized. There is free rotation about the carbonyl carbon and nitrogen bond: True, the peptide bond between amino acids in a protein is a single bond, which allows for rotation about the bond, this is one reason proteins can adopt many different conformations.There is substantial double-bond character to this bond: False, the peptide bond is actually a single bond, although it has some double-bond character, it is not a double bond.There is a net negative charge on nitrogen and net positive charge on oxygen: False, both nitrogen and oxygen atoms in a peptide bond are neutral, as there is no charge separation in the bond.
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When you go to the doctor for an illness, the doctor asks you how you feel. You describe all your symptoms. Then, the doctor makes a hypothesis about which organ system is having problems. Read each set of symptoms below. Then, match each set of symptoms with the the appropriate organ system.
stomach ache, gassy, ___________________________
no appetite
sneezing all the time, runny nose, __________________________---
trouble breathing, coughing
having a very hard time remembering people's
names, feeling sad and anxious _______________________
seem to be catching every disease that comes around,
taking a long time to get better ________________________-
1. Respiratory System
2.Nervous System
3.Immune System
4.Digestive System
Stomach ache, gassy ,no appetite is related to problems with digestive tract while sneezing all the time, runny nose is related to respiratory system while having a very hard time remembering people's is related to nervous system while seeming to be catching every disease that comes around,taking a long time to get better is related to immune system.
What is digestive tract?
It consists of the gastrointestinal tract along with the accessory organs which are present in digestion process . It involves the breakdown of complex food into smaller components which can be easily assimilated and absorbed by the body.
The digestion process has 3 phases: cephalic phase , gastric phase and intestinal phase.Cephalic phase begins with secretion of gastric juices from gastric glands in response to sight and smell of food.It involves chewing and chemical breakdown of food by the action of digestive enzymes ,saliva in the mouth contain enzymes like lipase and amylase which are secreted by the salivary and serous glands present on the tongue.
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Mg + 2HCl --> MgCl2 + H2(g)
Assuming STP, how many moles of hydrogen gas did Carl and his partner collect if they collected 5. 6L?
Curious Carl and his lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid. They observed bubbles being produced and did a variety of tests to identify the escaping gas; it proved to be hydrogen. The reaction is represented by the following equation.
A) 0. 250 moles
B) 2. 78 moles
C) 5. 60 moles
D) 11. 2 moles
5.60 moles of hydrogen gas did Carl and his partner collect if they collected 5. 6L.
Give a brief account on Moles ?The mole, also called Avogadro's number, is a unit of measurement used in chemistry to express the amount of matter. It is defined as the number of entities (atoms, molecules, ions, etc.) in a given sample of matter. The number of mole entities is known as Avogadro's number and is approximately 6,022 x 10²³. Moles can also be used to represent the number of units of matter in a chemical reaction. For example, the equilibrium equation for the reaction of magnesium and hydrochloric acid is Mg + 2HCl → MgCl₂ + H₂. This equation shows that for every mole of magnesium, 2 moles of hydrochloric acid are required to produce 1 mole of magnesium chloride and 1 mole of hydrogen gas.
In summary, a mole is a unit of measurement used in chemistry to describe the amount of substance. It is defined as the number of units in a particular sample of matter and is known as Avogadro's number. It can be used to convert between the mass and number of units of matter, and to describe the number of units of matter in chemical reactions.
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Write a balanced net ionic equation for a neutralization reaction that results in the formation of sodium fluoride.
Balanced net ionic equation for a neutralization reaction that results in the formation of sodium fluoride is Na+ + F- → NaF
What is neutralization reaction?A neutralization reaction is a chemical reaction that occurs when an acid and a base react to form a salt and water. This type of reaction is exothermic, meaning that it releases energy in the form of heat. During a neutralization reaction, hydrogen ions from the acid are neutralized by the hydroxide ions from the base. The byproduct of this reaction is a salt and water. The salt produced depends on the acid and base used in the reaction, and the pH of the solution is neutralized to 7.0.
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How does reactivity vary when moving from left to right in third period of modern periodic table?
In the modern periodic table, reactivity increases when moving from left to right in the third period because metallic character decreases along a period.
The elements in the modern periodic table are arranged in 7 periods and 18 groups in a certain manner such that along a period , the metallic character of the element decreases and non-metallic character increases while on moving from top to bottom in a group, the metallic character increases and non-metallic character decreases.
The metallic character of elements depends upon its ability to lose electrons. Along a group, the size of atom increases and gradually the nuclear pull decreases so they can readily lose electrons but across a period, atomic size decreases and nuclear pull increases so they cannot lose electrons easily.
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Predict the molecular geometries of the following species, respectively: IF3, TeF4, XeF51+.
a. T-shaped, see-saw, square pyramidal
b. trigonal planar, tetrahedral, square pyramidal
c. trigonal pyramidal, tetrahedral, see-saw
d. trigonal planar, see-saw, square planar
e. trigonal pyramidal, square planar, linear
a. T-shaped, see-saw, square pyramidal.IF3: The Lewis structure of IF3 consists of a central I atom, which is surrounded by three F atoms.
IF3: The Lewis structure of IF3 consists of a central I atom, which is surrounded by three F atoms. The three F atoms are arranged in a symmetric, T-shaped geometry.
TeF4: The Lewis structure of TeF4 consists of a central Te atom, which is surrounded by four F atoms. The four F atoms are arranged in a symmetric, trigonal planar geometry.
XeF5+: The Lewis structure of XeF5+ consists of a central Xe atom, which is surrounded by five F atoms. The five F atoms are arranged in a symmetric, square pyramidal geometry.
a. T-shaped, see-saw, square pyramidal.
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write the oxidation number of the oxygen atoms in h2o2 and the oxidation number of the oxygen atoms in o2
the oxidation number of the oxygen atoms in h2o2 and the oxidation number of the oxygen atoms in o2 is -1 and 0
An atom's oxidation number (also known as oxidation state) in a chemical is an amount that represents the amount of electron density gained or lost by the atom during in the formation of the compound. In general, the oxidising number of an element in a compound can be determined using the following rules: n element's oxidising number is null whenever it is unrestricted (uncombined). The oxidation number of a polyatomic ion is equivalent towards the ion's charge. We can use these rules to calculate the oxidation number of the oxygen atoms in H2O2 and O2: In H2O2, the oxidation number of the oxygen atoms is -1. This is because the compound is neutral and the hydrogen atoms have an oxidation number of +1, so the oxygen atoms must have an oxidation number of -1 in order for the sum of all the oxidation numbers to be zero. In O2, the oxidation number of the oxygen atoms is 0. This is because the compound is a diatomic molecule and the oxidation number of the free element oxygen is 0.
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suppose scientist have found three oxide materials that could potentially be used as a cathode to a magnesium or sodium anode in a battery for electrons plan an investigation to determine the best battery what characteristics did you test for
The sodium is the anode of the cell while the magnesium is the cathode of the cell.
How would the investigation go?We know that in the cell, we are going to have just about two electrodes in the cell and we would have the cathode and the anode. We have to know that the cathode is the point by which the current would enter the cell and the cathode is the point from which the current would leave the cell.
Having said this, we should know that the investigation would have to take into account the reduction potentials of the magnesium as well as that of the sodium as these can be used in the construction of the cell that is under study here.
Hence, by consideration of the electrode potentials, we can see that the sodium would have to act as the anode of the cell and we would keep up with the magnesium as the cathode of the cell.
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When ammonium chloride and water interact, less energy is released from breaking the bonds in the water and ammonium chloride than what is required to form the bonds of the new substance.What is happening in the reaction
Endothermic reaction is taking place in the reaction; as ammonium chloride and water contact, less energy is generated by breaking the bonds between the two substances.
Than what is needed to create the new substance's connections. Endothermic reactions are those in which the reactants take in heat energy from their environment to create products. These reactions produce a cooling effect by bringing the temperature of the space around them lower. Endothermic physical processes are also possible; for example, ice cubes can melt into liquid water by absorbing heat energy from their environment (no chemical bonds are broken or formed). With the chemical formula NH4Cl, ammonium chloride is an inorganic substance that is a white, crystalline salt that is very soluble in water.
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Can you divide equation I by another factor and still have it be correct?
Equation I cannot be divided by another factor as it will introduce errors in the equation.
What are errors?Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.
There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.
Errors while measuring boiling point may be human errors while noting down the boiling temperature or instrumental or systematic error if there is a fault in the thermometer.
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How many moles of aspartame are present in 4.50 mg mg of aspartame?
1.53 × 10⁻⁵ moles of aspartame are present in 4.50 mg of aspartame.
Two amino acids, aspartic acid and phenylalanine, make up the low-calorie sweetener known as aspartame. In addition to being present in tabletop sweetener packets, aspartame is a common component used to substitute sugar in low-calorie foods and beverages.
Here there are 4.50 mg of aspartame.
First, the mass is converted from mg to g by:
1 g = 1000 mg
So, 1 mg = 0.001 g
So, 4.5 mg = 4.5 × 10⁻³ g
Molar mass of aspartame = 294.40 g/mol
So, Number of moles of aspartame = [tex]\frac{Given mass}{Molar mass}[/tex]
or, n = 4.5 × 10⁻³ / 294.3
or, n = 1.53 × 10⁻⁵ moles.
Hence, 4.50 mg of aspartame has 1.53 × 10⁻⁵ moles of aspartame.
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Analysis of a compound formed between magnesium and nitrogen showed it contained 14.4g of magnesium and 5.6.g of nitrogen.
What is the empirical formula of the compound?
A Mg2N3
B Mg3N2
CMg4N6
D Mg6N4
And why is it that way?
Answer:
B. Mg3N2
Explanation:
There are 20.0 grams total material (14.4g Mg and 5.6 g N). We can convert grams into moles of each element by dividing by that element's molar mass (g/mole) to yield the number of moles of each element. To find the empirical formula, we need to convert the moles of each to a whole number by using a fracor that provides a whole number for each element. 5 works well, and we get 0.6x5 = 3 Mg atoms and 0.4x5 = 2 N atoms.
Mass % g/mole grams moles Factor of 5
Mg 72.00% 24.305 14.4 0.6 2.962 or 3
N 28.00% 14.007 5.6 0.4 1.999 or 2
100.0% 20 1.0
There are 3 Mg and 2 N atoms per molecule. The empirical formula is Mg3N2.
Which of thee would NOT
be conidered a biome?
A. A region that ha everal grouping of
the ame plant communitie. B. A region that ha everal grouping
of the ame animal communitie. C. A mall habitat that contain it own
ecoytem (uch a a tree tump). D. A large area of the Earth that ha a
imilar climate
A large area of the Earth that has a similar climate is not considered a biome.
Hence, option D is correct.
Scientists can identify a biome by defining the range of temperatures, the kind of soil, the amount of light, and the amount of water that are distinctive to that location. These factors create niches for particular species.A biome is a community made up of all the habitats in a given region and climate, whereas a habitat is the place where a group of one type of organism (a population) resides. Different creatures live in many types of biomes.Scientists disagree on the exact number of biomes that exist on earth, therefore we will focus on the six most significant ones: freshwater, marine, desert, forest, grassland, and tundra.
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H2O2 → H2O+ ½ O2
Hydrogen peroxide decomposes to produce water and oxygen according to the equation above. An experimentally determined graph for the first-order decomposition of hydrogen peroxide is provided below.
Which of the following best identifies the rate constant k for the reaction based on the information in the plot of ln[H2O2] versus time (t)?
O k = ln[H2O2] at t = 0s
O k = ln[H2O2] at t = 500s
O k = −(slope of plot)
O k = −1/(slope of plot)
k = -1/(slope of plot) is the correct answer to identify the rate constant k for the reaction based on the information in the plot of ln[H2O2] versus time (t).
The equation for the first-order decomposition of hydrogen peroxide is H2O2 → H2O+ ½ O2The graph provided is a plot of ln[H2O2] versus time (t)The rate constant (k) is a measure of how fast a reaction occursIn the context of first-order reactions, the rate constant is related to the slope of a plot of ln[H2O2] versus time (t)Therefore, the rate constant can be determined by finding the slope of the plot and then using the formula k = -1/(slope of plot)
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Question 1 For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate. HCl(aq) + NaOH(aq) + NaCl(aq) + H20(1)
A student was given the task of titrating a 20.mL sample of 0.10MHCl(aq) with 0.10MNaOH(aq). The HCl(aq) was placed in an Erlenmeyer flask. An equation for the reaction that occurs during the titration is given above. (a) According to the equation for the reaction, if the amount of the reactants is halved, how does this affect the amount of H20(I) produced in the reaction?
Titration is a quantitative analysis method for determining the concentration of a substance from a measured titrant. According to the equation, if the reactants are halved, the amount of H2O produced will be halved.
The molecular equations for sodium hydroxide, hydrochloric acid, sodium chloride, and water can be expressed as:
HCl + NaOH ⇒ NaCl + [tex]H_{2}[/tex]O
In the given equations, the spectator ions and the ionic equation can be distinguished as follows:
H⁺ + Cl⁻ Na⁺ + OH⁻ ⇒ Na⁺ + Cl⁻ + 2H⁺ + O⁻²
The net ionic equation is:
H⁺ + OH⁻ ⇒ [tex]H_{2}[/tex]O
From the above equation, we can see that the production of water molecules depends on the number of reactants. The reactants are,
H⁺ and OH⁻.
Therefore, when the number of reactants is halved, the resulting water molecules are halved.
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Consider the following equilibrium: Now suppose a reaction vessel is filled with 0. 0406 atm of nitrogen (N_2) and 5. 97 atm of ammonia (NH_3) at 1126. Degree C. Answer the following question this system: Under these conditions, will the pressure of N_2 tend to rise or fall? rise fall Is it possible to reverse this tendency by adding H_2? In other words, if you said the pressure of N_2 will tend to rise, can that be changed to a tendency to fall adding H_2? Similarly, if you said the pressure of N_2 will tend to fall, can that be changed to a tendency to rise by adding H_2? Yes no If you said the tendency can be reversed in the second question, calculate the minimum pressure of H_2 needed to reverse it. Round your answer to 2 significant digits. Atm
Yes, if we add a lot of H₂, the value of K will start falling, which will cause the reaction to move forward. The minimum pressure of H₂ needed to reverse it is 3.598atm.
Describe pressure.The force applied per area is referred to as pressure.
ΔG° = -RT ln(K)
34000 = 8.314(273 + 1126)ln(K)
ln(K) = 2.9231
K = [tex]e^{2.9231}[/tex] = 18.834
Since the container doesn't contain any H₂ gas, K will therefore start out at infinity. The reaction will move in the opposite direction in order to reach equilibrium. Consequently, the pressure of N₂ will initially rise.
Yes, if we add a lot of H₂, the value of K will start falling, which will cause the reaction to move forward.
The answer is therefore yes.
K = (5.97)²/0.0406(PH₂)³
K = 3.598atm.
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What do these two changes have in common?
a slice of banana turning brown
acid rain weathering a marble statue
Select all that apply.
Both are only physical changes
Both are only chemical changes
Both are caused by heating
Both are caused by cooling
Answer:
both are only physical changes
Answer:both are only chemical
Explanation:
Baed on the preure information in the data table, how are the preure of light and heavy particle related to the preure of the mixed particle?
Based on the pressure information in the data table, the pressure of light and heavy particle related to the pressure of the mixed particle having same pressure and same volume.
Why do heavy and light particles experience the same pressure?The lighter H₂ molecules will hit the walls more frequently and with less force because they move faster and collide with them more frequently. Because both light and heavy molecules hit the walls with roughly the same average kinetic energy at the same T, their pressure and consequent volume will be equal.
As the temperature increases, the particles gain energy and accelerate their motion. The movement of heavier particles is slower than that of lighter ones at the same temperature. Both the environment and the particles' mass affect their actual average speed.
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Complete question is" Based on the pressure information in the data table, how are the pressure of light and heavy particle related to the pressure of the mixed particle?".
Why do we use an excess of aldehyde in the aldol-dehydration reaction? O to form an enolate anion O to insure that the double aldol-dehydration takes place O to react with the free radicals
O to prevent air-oxidation
Option B, Using an excess of aldehyde in the aldol-dehydration reaction is done primarily to ensure complete conversion of the reactants to the desired product.
An excess of aldehyde is used to ensure that there is a sufficient concentration of the aldehyde present in order to form the enolate anion, which is the reactive intermediate in the aldol-dehydration reaction. To achieve high yield: Using an excess of aldehyde allows for the formation of multiple enolate anions, which increases the chances of a double aldol-dehydration reaction taking place, resulting in the formation of the desired product. Using an excess of aldehyde helps aldol-dehydration to prevent this by reducing the exposure of the aldehyde to air.
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When atoms of aluminum-27 are bombarded with alpha particles, a neutron and an element are produced. The particular isotope formed is
An alpha particle bombardment of aluminum with an atomic number of 27 results in the production of a neutron and phosphorus 15. The particular isotope formed is aluminum-28.
Fundamental alterations take place at the level of the atomic nucleus during nuclear reactions. Analyze the properties of the neutron, which has a mass similar to that of a proton but no electric charge. As a result, when it interacts with the aluminum core, the atomic number should remain constant but the atomic mass should rise by one unit. The newly produced atom is in an excited state when it transitions to the base state with the emission of a high-energy radiation called a gamma ray. Aluminum-28 isotope is formed. ⁷A₂₇ + ⁰n₁ → ⁷Al₂₈ˣ
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Please help, I have tried everything that I can think of
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, theoretical yield of Al[tex]_2[/tex]O[tex]_3[/tex] is 136g.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
4AI + 3O[tex]_2[/tex]→ 2Al[tex]_2[/tex]O[tex]_3[/tex]
moles of Al =54/26=2.07
moles of O[tex]_2[/tex]=64/32=2
Since oxygen is limiting reagent, so product will be according to oxygen
Theoretical yield of Al[tex]_2[/tex]O[tex]_3[/tex]=136g
Therefore, theoretical yield of Al[tex]_2[/tex]O[tex]_3[/tex] is 136g.
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the safety air bag in automobiles are inflated by nitrogen gas by the rapid decomposition of sodium azide:
sodium azide (NaN3) is used to inflate the safety airbags in automobiles (g) This airbag should be filled with N2 at a pressure of 1.15 atm and temperature of 26.0°C. It has a volume of 36 L.
Modern automobiles use numerous technical components and subsystems, each of which performs a specific design function. Some of these have thousands of individual pieces and were made possible by new or improved technologies, such as electronic computers, high-strength polymers, and novel alloys of steel and nonferrous metals. Air pollution, safety regulations, and global manufacturer competition, among other things, have all contributed to the development of some subsystems.
With an estimated 1.4 billion in use worldwide, passenger vehicles have become the main form of family transportation. In the United States, where more than three trillion miles (almost five trillion kilometers) are traveled annually, roughly one-fourth of these are located.
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Glass is typically produced by mixing sand (quartz or silica, SiO_2) with other compounds or minerals, which are then crushed, melted, and then cooled (vitrification). Given the compositions and properties of the different types of glass in the table above, consider the role each compound plays in the type of glass formed, and then complete the statements below. Match the compounds in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Adding to the mixture that undergoes vitrification produces a glass with brilliant optical properties. Adding to the mixture that undergoes vitrification produces a glass that can be used for baking purposes or storing chemical solutions. Adding to the mixture that undergoes vitrification produces a glass that is insoluble in water. Adding to the mixture that undergoes vitrification allows the glass to be produced at much lower temperatures.
Addition of soda (Na₂CO₃) to the vitrifying mixture produces glasses with excellent optical properties.
Give a brief account on silica?Silica is the common name for the compound silicon dioxide, which consists of one silicon atom and two oxygen atoms. It is an important component of many rocks, sands, and clays, and is also found in many plants and animals. Silica is used in a wide variety of products, from beer and wine to pottery, glass, and paint. It is also used in building materials such as concrete and mortar, and as a food additive. Silica is also used to make silicon-based electronics such as computer chips.
Adding lime (CaCO₃) to the vitrifying mixture creates a jar that can be used to bake or store the liquid medicine.
Addition of alumina (Al₂O₃) to a mixture undergoing vitrification produces a glass that is insoluble in water.
Addition of borax (Na₂B₄O₇) to the mixture during vitrification allows glass to be produced at much lower temperatures.
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The type of bonding and the number of covalent bonds an atom can form with other atoms is determined by __________
The type of bonding and the number of covalent bonds an atom can form with other atoms is determined by number of unpaired electrons.
The number of unpaired electrons in the valence shell because covalent bond is equal to a chemical bond that involves sharing a pair of electrons between atoms in a molecule. When electrons are shared among atoms, they make a bond known as a covalent bond. Because atoms are sharing one pair of electrons, this covalent bond is known as a single bond. These atoms can do the equal aspect that the H atoms did; they proportion their unpaired electrons to make a covalent bond.
Thus, the number of unpaired electrons is useful in the type of bonding and the number of covalent bonds.
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What were the 3 missing elements in the periodic table?
The three missing elements in the periodic table are gallium, germanium and scandium.
Gallium, germanium, and scandium have been all unknown in 1871, however, Mendeleev left areas for every and expected their atomic loads and different chemical properties. Within 15 years, the “lacking” factors have been discovered, conforming to the simple traits Mendeleev had recorded. Scientists in Japan suppose they have eventually created the elusive detail 113, one of the lacking gadgets at the periodic table of factors. Element 113 is an atom with 113 protons in its nucleus — a kind of depend that should be created inner a laboratory as it isn't always located evidently on Earth.
The elements are gallium, germanium and scandium.
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