Periodic Table: Why are group 1A elements called alkali metals?
Answer:
Explanation:
The elements in Group I of the periodic table are called alkali metals. They are called alkali metals because they react with water to form alkali solutions. These metals are very reactive; hence they have to be stored under oil to protect them from corrosion by air and waterwaterwater
The group 1A elements, called alkali metals because they form alkalies on reacting with water. Alkalies are strong bases.
What are the alkali metals?They are the metals that are soft, lustrous, and have a low melting point. Air and moisture react readily with alkali metals.
Special precautions must be taken when using and storing these metals due to their reactivity.
The seven alkali metals are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
Thus, the group 1A elements, called alkali metals because they form alkalies on reacting with water. Alkalies are strong bases.
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32. 2 g of ethyl alcohol is dissolved in water to make a 0. 50 L
solution. What is the molarity of the solution?
Answer:
Well, by definition,
molarity = moles of solute
volume of solution
Explanation:
Now the moles of solute are a constant. The volume of solution MAY change substantially with increasing or decreasing temperature. In some calculations molality is used in preference, which is defined by the quotien
Hope this helps!
why is solar energy a viable alternative energy resource?
Solar energy is a viable alternative energy resource due to its high usage application.
Why is solar energy a viable alternative energy resource?The solar energy is considered as a viable alternative energy resource because this energy can used in the form of electricity for operating all electrical devices present in our homes.
So we can conclude that solar energy is a viable alternative energy resource due to its high usage application.
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Answer:
It has an endless supply is the answer.
What is the hydronium and hydroxide concentrations of a solution that is 5.0 x 10-3 M H2SO4.
The hydronium and hydroxide concentrations of a solution that is 5.0 x 10-3 M H2SO4 is 2.7.
What is pH?PH is the degree of alkalinity and acidicity in a solution.
From the question,
pH= -log[H+] - (i)
10^-3=H2So4
H+= 2×10-3
here ,
h2so4 ——— 2[H+] + so4^2-
thus [H+]= 2*10^(-3) because hydrogen ion has two moles
pH= -log[H+]
pH= -log(2×10^-3)
pH= 3-log2
pH= 3-log2pH= 2.7
The pH is 2.7
Therefore, The hydronium and hydroxide concentrations of a solution that is 5.0 x 10-3 M H2SO4 is 2.7
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How many molecules are in 37 grams of H2O
Answer:
2.053812097286304 mol
A group of students observed a sample of soil and recorded their observations.
reddish-brown color
don’t need a magnifying glass to see grains
gritty when dry
sticks to my fingers when wet
doesn’t smell like anything
dries quickly
does not get foamy with vinegar
damp soil made a ball but it fell apart quickly
What type of soil did the students observe? Use evidence from the students’ observations to support your answer.
Based on the observations of the students, the soil they observed appears to be a sandy soil.
What is Foamy?
Foamy refers to the presence of bubbles or foam in a liquid or substance. It can be caused by a variety of factors, such as agitation, the presence of certain chemicals, or the release of gases. In the context of the soil observation mentioned earlier, the lack of foamy reaction with vinegar suggests that the soil does not contain a significant amount of carbonates, which are a common cause of foaming when they react with acids.
Evidence to support this includes the fact that the soil is gritty when dry and sticks to their fingers when wet, which are both common characteristics of sandy soil. Additionally, the observation that the soil does not get foamy with vinegar suggests that it does not contain a lot of organic matter, which is another characteristic of sandy soil. Finally, the fact that the damp soil made a ball but it fell apart quickly suggests that the soil does not have a lot of clay, which is another characteristic of sandy soil.
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Is mixing baking soda and vegetable oil a chemical change or physical change and WHY? PLEASE HELP
Answer:
chemical change i think
Explanation:
As the drops of vinegar fall through the oil to the bottom of the bottle, it reacts with the baking soda to make carbon dioxide gas. These bubbles attach themselves to the colored vinegar and cause them to float to the surface. When the bubbles pop, the color sinks back to the bottom of the bottle.
What enables humans to "see" light in the infrared range of the electromagnetic spectrum?
RF technology
UV converter
microwave sensor
night-vision goggles
Night vision Goggle's help human to see light in the infrared range of the electromagnetic spectrum.
What is Night vision Goggle's?Night-vision device Goggle is an optical device that is use to view images and allows images to be produced or refracted at different levels of lnfrared light approaching from electromagnetic spectrum.
Therefore, Night vision Goggle's help human to see light in the infrared range of the electromagnetic spectrum
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In an atom the number of electrons is
as the
number of protons.
the only time electrons are equal to protons is when the charge is neutral. if the charge is positive then there's more protons.
if the charge is negative then there's more electrons.
N2 (g) + 3H2 (g) ⇔ 2NH3 (g) + Energy
Complete the table below by filling in "right" or "left" for the equilibrium shift and "increases" or "decreases" for the concentration of reactants and products.
Answer:
b is the answer
You are a NASA engineer. You are the chief engineer for the Apollo 13 mission to the moon. The astronauts are running out of oxygen and need to get rid of the excess carbon dioxide. You know that sodium hydroxide (NaOH) has been suggested as a means of removing carbon dioxide from the spacecraft cabin. The filter which they had been using is fully saturated and no longer works. You remember that the astronauts have a 5000. g container of sodium hydroxide on the ship. You also know that sodium hydroxide can be used to remove carbon dioxide.
Use the following reaction: NaOH + CO2 → Na2CO3 + H2O
The astronauts have 2 days left before they land on Earth. You know that there are three astronauts, and each astronaut emits roughly 500. g Of carbon dioxide each day. Is there enough sodium hydroxide in the cabin to cleanse the cabin air of the carbon dioxide, or are the astronauts doomed?
Given the data from the question, the astronauts do not have enough sodium hydroxide in the cabin to cleanse the cabin air of the carbon dioxide.
How to determine the total CO₂CO₂ emitted per astronaut per day = 500 gCO₂ for 3 astronaut per day = 3 × 500 = 1500 gCO₂ for 3 astronaut for 2 days = 2 × 1500 = 3000 gBalanced equation
2NaOH + CO₂ —>Na₂CO₃ + H₂O
Molar mass of NaOH = 40 g/mol
Mass of NaOH from the balanced equation = 2 × 40 = 80 g
Molar mass of CO₂ = 44 g/mol
Mass of CO₂ from the balanced equation = 1 × 44 = 44 g
SUMMARY
From the balanced equation above,
44 g of CO₂ required 80 g of NaOH
How to determine the mass of NaOH neededFrom the balanced equation above,
44 g of CO₂ required 80 g of NaOH
Therefore,
3000 g of CO₂ will require = (3000 × 80) / 44 = 5454.55 g of NaOH
From the calculation made above, we can see that 5454.55 g of NaOH is needed by the astronaut to clean the cabin air but unfortunately, they only have 5000 g of NaOH.
Thus, we can conclude that the astronauts do not have enough NaOH to clean the air
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what is double displacement reaction
Answer:
A salt metathesis reaction, sometimes called a double displacement reaction, is a chemical process involving the exchange of bonds between two reacting chemical species which results in the creation of products with similar or identical bonding affiliations.
Explanation:
From: Wikipedia
4.
Solve: For each chemical equation below, write the number of product molecules that
will form from the reaction. Then circle the limiting reactant. (Note: The coefficients in
front of the reactants indicate the number of reactant molecules or atoms present.)
For all the reactions listed, the moles of products and limiting reactants are;
1. Molar cofficient - 6, oxygen is the limiting reactant
2. Molar coefficient - 8 chlorine is the limiting reactant
3. Molar coefficient - 4 and CO2 is the limiting reactant
What is a chemical reaction?
A chemical reaction is a combination of reactants that yields products. Recall that the limiting reactant is the reactant that nis present in the least amount.
Let us now complete each reaction;
1. The molar coefficient of the product in reaction 1 is 6 and oxygen is the limiting reactant
2. The molar For all the reactions listed coefficent of the product in reaction 2 is 8 and chlorine is the limiting reactant
3. The molar coefficient of the product in reaction 3 is 4 and the limiting reactant is CO2.
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the states of matter involved in a milkshake
Answer:
it is a liquid that is made from the combination of a liquid and a solid.
Explanation:
When these two states of matter are ground and mixed together, they form one state that is liquid
Answer:
Solid and liquid
Explanation:
Solid= ice cream or ice
Liquid= milk
these are common things used in a milkshake
Issue like gay marriage, abortion, and education have caused debate over the constitution because of the issue of what? (Hint: federalism)
You see color when light waves are reflected off an object or ____ by an object
Answer:
absorbed
Explanation:
Different colors of light can be reflected or absorbed and that determines color. For instance an object that absorbs every color but green will appear green to the human eye.
uhh i need help please its sience not chemistri sorry just cant find sience in there
they can survive without oxygen, this is bio btw :)
How many atoms of N are in 137. 0 grams of N2O3? A. 1. 085 × 1023 B. 1. 802 × 1023 C. 5. 985 × 1023 D. 2. 171 × 1024 E. 3. 604 × 1024.
The number of atoms of nitrogen present in 137 grams of N₂O₃ in 2.1 × 10²⁴.
What is Avogadro's number?Avogadro's number is that number which tells about the number of atoms or entities of any substance present in one mole of any substance, i.e. 1 mole = 6.022 × 10²³
First we have to convert mass of N₂O₃ to moles by using the below formula:
n = W/M, where
W = given mass = 137g
M = molar mass = 76g/mol
Moles of N₂O₃ = 137 / 76 = 1.8mol
From the stoichiometry of the mass and formula it is clear that:
In 76g of N₂O₃ = 2 moles of Nitrogens are present
In 137g of N₂O₃ = 2/76×137=3.6 moles of Nitrogens are present
No. of N atoms in 3.6 moles = 3.6 × 6.022 × 10²³ = 2.1 × 10²⁴
Hence option (D) is correct.
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Suppose object A has double the specific heat and triple the mass of object B. If the same amount of heat is applied to both objects, how will the temperature change of A be related to the temperature change of B? Enter your answer to three significant figures.
Taking into account the definition of calorimetry, the temperature change of A will be one sixth of the temperature change of B.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
Temperature change of A related to the temperature change of BIn this case, for object A:
QA = cA× mA× (ΔT)A
and for object B:
QB = cB× mB× (ΔT)B
You know:
Object A has double the specific heat of object B. ⇒ cA= 2× cB
Object A has triple the mass of object B. ⇒ mA= 3× mB
If the same amount of heat is applied to both objects ⇒ QA= QB
Then:
cA× mA× (ΔT)A= QB = cB× mB× (ΔT)B
2× cB × 3× mB× (ΔT)A= cB× mB× (ΔT)B
Solving:
6× cB × mB× (ΔT)A= cB× mB× (ΔT)B
(ΔT)A= (cB× mB× (ΔT)B) ÷ (6× cB × mB)
(ΔT)A=[tex]\frac{1}{6}[/tex] (ΔT)B
Finally, the temperature change of A will be one sixth of the temperature change of B.
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Explain why natural resources are not distributed equally across Earth.
What is the effect on the total pressure inside a closed vessel if... a) More gas is added? b) The container's volume is increased?
(a) When more gas is added, the number of moles of the gas increases, and the total pressure of gas inside same vessel will increase.
(b) When the conatiner's volume is increased, the total pressure of gas inside the vessel will decrease.
Ideal gas lawThe ideal gas law of general gas equation, can be used to describe the behavior of an ideal gas.
The ideal gas law is given as;
PV = nRT
where;
P is pressure of the gasV is the volume of the gasn is the number of gas molesR is ideal gas constantT is temperature of the gasWhen more gas is added, the number of moles of the gas increases, and the total pressure of gas inside same vessel will increase.
When the conatiner's volume is increased, the total pressure of gas inside the vessel will decrease.
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how many inches are there in 62.8 cm?
Answer:
24.7
Explanation:
Answer: ~24.72in
Explanation:
1 inch = 2.54 centimeters
divide 62.8cm by 2.54 which gives us approximately 24.72in.
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ASAP HELP
The troposphere revives most of its heat energy from the blank
a.
Which of the following correctly describes the composition of an electromagnetic wave?
a transverse electric wave and a magnetic C. a transverse electric wave and a magnetic
transverse wave that are parallel and are
transverse wave that are parallel and are
moving in the same direction
moving at right angles to each other
b. a transverse electric wave and a magnetic d. a transverse electric wave and a magnetic
transverse wave that are perpendicular and are transverse wave that are perpendicular and are
moving in the same direction
moving at right angles to each other
Answer:
a transverse electric wave and a magnetic transverse wave that are perpendicular and are moving in the same direction.
Explanation:
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What color should appear when a properly cleaned nichrome wire is introduced into the flame?.
Answer: The color that will appear when the nichrome wire is properly cleaned and introduced into flame would be orange
When people talk about the phrase “blood sugar,” they really mean?
Answer:
Specific chemical sugar glucose
Explanation:
When we say “blood sugar,” we mean the specific chemical sugar glucose. Diabetes is all about glucose. There lots of sugars….table sugar is sucrose, malt sugar is maltose, milk sugar is lactose, and you’ve probably heard of fructose.
Blood sugar, or glucose, is the main sugar found in your blood. It comes from the food you eat, and is your body's main source of energy. Your blood carries glucose to all of your body's cells to use for energy.
Pls mark me brainiest and my name is Misty.
what is The relationship between a carnivore and an herbivore can be stated as
A
parasite and host
B
predator and prey
C
prey and predator
D
scavenger and parasite
A 6.0-mol sample of KClO3 was decomposed according to the equation 2KClO3 --> 2KCl + 3O2. How many moles of O2 are formed?
9.0 mol
2.5 mol
6.0 mol
4.5 mol
Answer:
2.5 mol is the answer
Explanation:
hope it will help you..
9 moles of O2
Balanced equation: 2KClO3 --> 2KCl + 3O2given:
6.0-mol of KClO3
using molar ratio:
2KClO3 : 3O2
2 : 3
moles of O₂ = ( 6/2 ) * 3 = 9 moles
What is s° for b in the reaction 3 a → 2 b if ∆s°(rxn) =-277. 1 j/mol ･ k? [s° (a) = (205. 0 j/mol ･k)]
Entropy is the degree of disorder of a system. The entropy of b is 168.95 j/mol ･k.
What is entropy?The term entropy refers to the degree of disorder in a system. We have to know that the change in entropy of a system is the entropy of the product minus the entropy of the reactants.
Hence;
-277. 1 = [2(b) - 3(205. 0)
-277. 1 = 2b - 615
b= -277. 1 + 615/2
= 168.95 j/mol ･k
The entropy of b is 168.95 j/mol ･k.
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Using the simulation, how can you show that it takes more energy to convert a liquid to a gas than a solid to a liquid?
Answer:
The enthalpy of vaporization of a given substance is much greater than its enthalpy of fusion because it takes more energy to completely separate molecules (c