CH4 is the compound with the lowest boiling point.
What compound's lowest point is this?Helium has the lowest melting temperature of all chemical elements, and carbon has the greatest melting point.
Which molecule does have the lowest boiling point, but how do you know?With a reduction in molecule size, the strength of the London dispersion forces also reduces Therefore, in this situation, the molecule with the fewest branches and shortest length has the smallest boiling point.
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The complete question is -
Which one of the following compounds will have the lowest boiling point? (a) NH3 (b) C2H6 (c) CH3 (d) H2O
There are two isotopes of bromine: 79Br with a 50.7% abundance and a mass of 78.92AMU, and Br
with a 49.3% abundance and mass of 80.92AMU. What is its average atomic mass?
Answer: the atomic mass is 70.9
Explanation:
What is the frequency of a wave in kilohertz if it has an energy of
45 x 10 kilojoules?
The frequency of a wave in kilohertz is 6.74 x 10^35 kilohertz
It is given that
Energy of wave = 45 x 10 kilojoules
Then the connection between the energy and frequency of a photon is remarkably simple
Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency for clarity, and is distinct from angular frequency. Frequency is measured in hertz (Hz) which is equal to one event per second.
The energy equation is a direct relationship between frequency and energy because as frequency increases, so does energy.
E = h × f
where h = 6.67 × 10^-34 joule
45 x 10 kilojoules = 6.67 × 10^-34 joule x f
f = 6.74 x 10^35 kilohertz
Hence, frequency of a wave in kilohertz is 6.74 x 10^35 kilohertz
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How many grams are in 0.02 moles of beryllium iodide, BeI2
Plsss help
Answer: 2.9 grams I belive.
Explanation:
What is the molar mass, in gmol-¹, of a compound if 0.200mol of the compound has a mass
of 13.2g?
A. 66.0
B. 66
C. 26.4
D. 26
Answer:
66g/mol
Explanation:
mole = 0.200mol
given mass = 13.2g
molar mass = ?
[tex]mole = \frac{ \\ given \: mass}{molar \: mass} [/tex]
make molar mass the subject of formula
[tex]mole \: \times molar \: mass = given \: mass[/tex]
[tex]molar \: mass = \frac{ \\ given \: mass}{mole} [/tex]
[tex]molar \: mass = \frac{ \\ 13.2g}{0.200mol} [/tex]
[tex] = { 66gmol}^{ - 1} [/tex]
What is the minimum water temperature when sanitizing utensils?
Answer: 171°F (77°C)
Explanation: Sanitizing for at least 30 seconds helps pH increases while chlorine becomes less effective as a sanitizer.
Element X has 30 protons and is known to exist as 3 isotopes. One isotope is 56.5% abundance and has 38 neutrons. Another isotope is 23.4% and has 39 neutrons. The other isotope is 20.1% and contains 40 neutrons. What is the average atomic mass?
i’ll give brainliest
Considering the definition of atomic mass, isotopes and atomic mass of an element, the average atomic mass of the element is 68.636.
Definition of atomic massThe atomic mass of an atom is equal to the sum total of protons and neutrons in the nucleus.
Definition of isotopeIsotopes are atoms whose atomic nuclei have the same number of protons but a different number of neutrons. This is, the atomic numbers are the same, but the number of neutrons is different.
Definition of atomic massThe atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
Atomic mass of the element in this caseIn this case, you know:
Element X has 30 protons.One isotope is 56.5% abundance and has 38 neutrons. Then, the atomic mass is 30 + 38= 68.Another isotope is 23.4% and has 39 neutrons. Then, the atomic mass is 30 + 39= 69.The other isotope is 20.1% and contains 40 neutrons. Then, the atomic mass is 30 + 40= 70.The average mass of the element is calculated as:
average mass= 68 ×0.565 + 69 ×0.234 + 70 ×0.201
average mass= 68.636
Finally, the atomic mass of the element is 68.636.
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Is it safe for the electrician to carry out electrical repair outdoors during heavy downpour?
Answer:
No
Explanation:
it's not safe because rain water consists of dissolved salts and it can conduct electricity hence the electrician might get shock.
Draw a structure for o-aminobenzoic acid.
The chemical formula for the o-aminobenzoic acid is C7H7NO2
Anthranilic acid is an aminobenzoic acid, a benzoic acid with a single amino substituent at the 2-position. In industrial settings, benzoic acid is most commonly used in the manufacture of a wide range of products such as perfumes, dyes, topical drugs, and insect repellents. Salts of benzoic acid (sodium benzoate) are used as pH regulators and It is widely used as a preservative to stop microbial development and keep food healthy. The moleculer structure consists of a benzene ring ortho-substituted with carboxylic acids and amines. Compounds are amphoteric because they contain both acidic and basic functional groups
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According to the theory of plate tectonics, the movement of plates cane form mountain ranges and valleys. Within the next 100 million years the Great Rift Valley in Africa will most likely become a ?
According to the theory of plate tectonics, the movement of plates can form mountain ranges and valleys. Within the next 100 million years, the Great Rift Valley in Africa will most likely become option d: wider and deeper valley.
What is plate tectonics?The Great Rift Valley is a large geological formation that runs through several countries in East Africa, including Kenya, Tanzania, and Ethiopia. It is a result of the separation of the African Plate and the Arabian Plate, which is still ongoing and causing the valley to widen and deepen.
The valley is also being filled with sediment, which will further deepen it over time. While mountain ranges can form as a result of plate tectonics, it is unlikely that the Great Rift Valley will become a folded mountain range in the next 100 million years.
Therefore, it is more likely that the valley will continue to widen and deepen, and the surrounding areas will become more arid due to climate change.
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See full question below
According to the theory of plate tectonics, the movement of plates can form mountain ranges and valleys. Within the next 100 million years, the Great Rift Valley in Africa will most likely become a
folded mountain range
flat eroded plain
desert covered with lava
wider and deeper valley
Sodium chloride (nacl) is the chemical name for table salt and potassium chloride (kcl) is a common salt substitute. Using the periodic table, choose the correct statement about how these compounds form.
Sodium and potassium lose electrons and chlorine gains them.
What is electrons?Electron, lightest stable subatomic particle known. It carries a negative charge of 1.602176634 × 10−19 coulomb, which is considered the basic unit of electric charge. The rest mass of the electron is 9.1093837015 × 10−31 kg, which is only 1/1,836the mass of a proton. An electron is therefore considered nearly massless in comparison with a proton or a neutron, and the electron mass is not included in calculating the mass number of an atom.\The electron was discovered in 1897 by the English physicist J.J. Thomson during investigations of cathode rays. His discovery of electrons, which he initially called corpuscles, played a pivotal role in revolutionizing knowledge of atomic structure. Under ordinary conditions electrons are bound to the positively charged nuclei of atoms by the attraction between opposite electric charges. In a neutral atom the number of electrons is identical to the number of positive charges on the nucleus.To learn more about nucleus refer to:
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D. A sample of aluminum metal weighs 56.79 grams.
a) How many moles does this contain?
b) How many atoms are there in this sample?
Be sure to show ALL of your work below.
Molar mass of Al:
In order to do this, we shall divide the provided mass by the aluminum atomic mass. Consequently, there are 2 moles in 54 g of aluminum.
How many moles of aluminum are present in the sample?Use the atomic mass of aluminum (26.982 g/mol) to convert between grams and moles. The answer is (1g Al) / 26.982 g/mol Al) = 0.03706 moles Al, assuming the sample is 100% Al. Nov 13, 2022
How is aluminum made from metals?Aluminum sulphates are the most prevalent type of aluminum in nature. These minerals are a combination of two sulphuric acids, one based on an alkaline metal (lithium, sodium, potassium, rubidium, or caesium), and the other based on a metal from the third group of the periodic table, mainly aluminum.
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Sam was given the following equation to balance: H₂O → H₂ + O₂. She balanced it as follows: 2HO → H₂ + O₂. What did she do wrong? What is the correct way to balance the equation?
Answer:
2H2O = 2H2 + O2.Explanation:
2H2O = H2 + O2
this ain't balanced because the value of hydrogen are not the same.
liquid co2 is not stable so we usually never see it. True or false
How the model of the atom changed as new evidence was discovered?
The atom's model evolved from a tiny solid ball to an atomic nucleus surrounded by electrons in orbit.
Why have the theories of the atom always changed?Since they were first published in 1803, atomic theories have evolved. Many scientists are curious about the model of the atom. The more discoveries the experts make about the atom, the more we learn that the theory of the atom changes toward perfection.How has the model of the atom changed with new evidence?
John Dalton in 1803 discovered:
All objects are made of atoms. Atoms can’t be divided. Atoms can be drawn as tiny solid balls. In terms of mass and properties, all atoms in a particular element are the same. Compounds are atoms that have been mixed from two or more different types. A chemical reaction is an atomic restructuring.JJ Thompson, in 1904, discovered:
The electrons. Atoms can be deconstructed into smaller pieces. An atom consists of tiny electrons with negative charges strewn about a positive charge sphere in the shape of a plum pudding, hence the name "the plum pudding model."Rutherford discovered in 1911 that :
Each atom has a positively charged nucleus that is orbited by electrons in its orbit. The movement of electrons around the nucleus is accompanied by the emission of energy. This causes the electron's energy to decrease over time, and its orbit will gradually approach the nucleus and fall into the nucleus.Niels Bohr then discovered in 1913 that:
An atom is composed of an atomic nucleus that contains protons and neutrons and is surrounded by electrons that rotate in orbits (a certain energy level). These orbits are known as atomic shells.
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1. The un rie over the horizon. Frame of reference:
2. A bu move pat people tanding on the idewalk. Frame of reference:
3. A paenger on a train ee a ball roll down the aile. Frame of reference:
4. Two expre ubway train traveling at the ame peed on parallel track whiz pat paenger waiting on the platform of a local tation. Frame of reference:
5. A paenger on one of the ubway train look out the window and ee another train tanding till. Frame of reference:
6. A peron tanding near a railroad track ee a train pa by, then notice an airplane fly overhead in the ame direction a the train, but at a much fater peed. Frame of reference:
7. A paenger in the airplane look down and ee the train moving backward. Frame of reference:
1. The sun rise over the horizon. Frame of reference: Background
2. A bus moves past people standing on the sidewalk. Frame of reference: Moving
3. A passenger on a train sees a ball roll down the aisle. Frame of reference: Object
4. Two express subway trains traveling at the same speed on parallel track whiz past passenger waiting on the platform of a local station. Frame of reference: Moving
5. A passenger on one of the subway train looks out the window and see another train standing still. Frame of reference: Stationary
6. A person standing near a railroad track sees a train pass by, then notice an airplane fly overhead in the same direction as the train, but at a much faster peed. Frame of reference: Compare
7. A passenger in the airplane look down and sees the train moving backward. Frame of reference: Object
A frame of reference is a collection of coordinates that may be used to calculate the locations and velocities of objects inside that frame; various frames of reference move relative to one another. When you observe a ball roll down a street, you can know it's moving also because frame of reference is the roadway, whatever's on the side of the road, or the Earth. These are all frames of reference. All motion data will be linked to a frame of reference.
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Condensed Formula
Butane Chain With Methyl Groups On Adjacent Carbons
Formula: CH3CH(CH3)CH2CH3 Acetyl Groups atop Adjacent Carbons in the Butane Chain
How so many chains can butane have?The chemical formula for butane, an alkane containing four carbon atoms, is C4H10. It has two isomers: n-butane and isobutane. Here, n-butane is just a straight-chain molecule with four atoms of carbon connected by a single covalent bond.
What is butane's parent chain?Butane serves as the parent chain, showing that the LCC contains four carbon atoms. The groups will then be added in the appropriate positions. As far as you are consistent, you can name the parent chain in any direction; however, you shouldn't switch first before structure is complete.
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The correct question is
Question: Condensed Formula Butane Chain With Methyl Groups On Adjacent Carbons Bond-Line Formula Draw Structure
Sep Obtain Information What are the Limitation to Making Progre with Engineering Better Batterie ? What progre have Battery Engineer Made?
Better batteries deals with Rechargeable lithium batteries are in the research phases where commercial usage of some of the new types of batteries is not possible so far.
These batteries have the potential to power portable electronics of today's time. It can store more energy in any given volume and leads to longer battery life. By changing the electrolyte composition it has made it safe for long term use. However these changes are not able to reflect on commercial scale.
Currently battery engineers are looking at improving use of these batteries in smart grid and electrical transports. For instance, researchers find that the energy density of lithium-sulfur (Li-S) batteries is five times higher in comparison to Li-ion batteries. Even they are most cost effective. But there is a major challenge of dropping voltage rapidly with use.
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Boron has two naturally occurring isotopes. In a sample of boron, 30% of the atoms are B-10, which is an isotope of boron with 5 neutrons and a mass of 10 AMU. The other 70% of the atoms are B-11, which is an isotope of boron with 6 neutrons and a mass of 11 AMU. What is the atomic mass of boron?
The average atomic mass of boron is derived from the isotopic masses and percentage abundance. The average atomic mass of boron is 10.7 amu.
What are isotopes?Isotopes are atoms of same element with different atomic mass numbers. Almost all elements have two or more isotopes but not all of them are stable in nature.
The average atomic mass can be calculated from the isotopic mass and and percentage abundance as follows:
atomic mass = ∑ (isotopic mass × %abundance /100 )
Apply the isotopic mass and abundance of all isotopes given as follows:
atomic mass of neon = (30/100 × 10 amu) + (70/100 × 11 amu) = 10.7 amu
Therefore, the atomic mass of boron is 10.7 amu.
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PLEASE HELP! How did the discovery of mid-ocean ridges support the hypothesis of continental drift?
Answer:Sea floor spreading is the phenomena of new sea floor being created through mid-ocean ridges. Wegener proposed that the continents themselves move, which is untrue. It is the tectonic plates that move. Sea floor spreading caused the break up of Pangea, which prompted Wegener to add this in support of his continental drift theory.
Explanation:
How many moles of Carbon Dioxide are in 5.6 x 1023 molecules of Carbon Dioxide?
Answer:
1 mol of CO2 or 40.01 g contains 6.022*10^23 molecules.
Then 5.5 g of CO2 will contain (5.5/40.01) *6.022*10^23 or 8.3*10^22 molecules
Explanation:
Can anyone help me with this question please?!
Answer: electrons
Explanation:
electrons are attracted to the nucleus by the charge of the protons. To get past this force, one would need to add energy. Ionization energy increases to the right and up (according to the periodic table trends) because there are more protons as you move across a period, making it harder to take an electron.
structure of benzophenone
The chemical molecule (C6H5)2CO, also referred to as Ph2CO, is benzophenone. The solid is white and dissolves in organic solvents.
Why does benzophenone appear in sunscreen?Some flowering plants contain benzophenone-3 (BP-3), a substance that occurs naturally. The sun's dangerous ultraviolet (UV) rays are absorbed and scattered by BP-3. It is created to be used as sunblock in lotions, shampoos, and cosmetics for this reason.
Benzophenone's toxicity levelOrgan System Toxicology Because that including can cause liver enlargement in rats at lower doses, it (Environmental protection agency) lists it as a recognized toxicant. Oxybenzone can penetrate the skin, build up in the blood, kidneys, and liver, and could be harmful to liver cells.
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The correct answer is
what is the structure of benzophenone ?
The element is:
The number 6 refers to the number of:
The numbers 12, 13, and 14 refer to the:
How many neutrons are in the first isotope?
How many neutrons are in the second isotope?
I
C&C C
How many neutrons are in the third isotope?
Answer:
The number 6 refers to the atomic number c. The numbers 12, 13, and 14 refer to the atomic mass d.
Explanation:
In this structure 6 represents atomic number that is the number of electrons or the number of protons and 13 represents the mass number (A). The number of neutrons (N) = mass number (A) − no. of electron or no. of proton. Hence N=13−6=7.
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Answer:
The number 6 refers to the atomic number c. The numbers 12, 13, and 14 refer to the atomic mass d.
Explanation:
Homework: Anticipation Guide
Anticipation Guide
Note: If you do not have access to Amplify Science at home, your teacher will provide you with an alternate way to complete this homework.
For each statement, indicate whether you agree or disagree.
Don’t worry about being right or wrong. This is your chance to think about what you already know about light. As you learn more during the unit, you will return to this guide to revise and explain your answers.
Light causes the same change to all materials.
All light is the same, whether it comes from the sun, a light bulb, or anywhere else.
All light can be seen.
Light can travel through materials that you cannot see through, like wood or aluminum foil.
Choose the statement you are most sure about. It can be a statement that you agree or disagree with.
Why do you agree or disagree with the statement you chose? Explain your thinking.
Among all the given options, the correct option is option A that is Light causes the same change to all materials. there are so many phenomenon that is attached to light.
What is light?Electromagnetic radiation that is visible to the human eye is referred to as light rays. The wavelengths of low energy radio waves, which are measured in meters, and high energy gamma rays, which have wavelengths smaller than 1x10-11 meters, are all included in the electromagnetic spectrum in its entirety.
The lowest unit of energy that is capable of moved is a photon, as well as the discovery because light can move in discrete quanta gave rise to quantum theory.
Therefore, the correct option is option A.
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a. A sample consisting of 1-bromopropane and 1-chloropropane is injected into a gas chromatograph equipped with a nonpolar column. Which compound has the shorter retention time? Explain your answer.
b. If the same sample were run several days later with the conditions as nearly the same as possible, would you expect the retention times to be identical to those obtained the first time? Explain.
A. The compound with the shorter retention time in a gas chromatograph equipped with a nonpolar column would be 1-chloropropane.
The retention time in gas chromatography is determined by the strength of the interactions between the sample molecules and the stationary phase (in this case, a nonpolar column). Nonpolar compounds tend to have stronger interactions with nonpolar stationary phases than polar compounds do.
1-chloropropane is a more nonpolar compound than 1-bromopropane, which has a polar bromine atom. Therefore, 1-chloropropane will have stronger interactions with the nonpolar stationary phase, resulting in a shorter retention time.
It's also worth noting that the retention time for each compound will depend on the specific conditions of the experiment, such as the column temperature and the flow rate of the carrier gas.
B. It is unlikely that the retention times for the same sample run on a gas chromatograph several days later would be identical to those obtained the first time. There are several reasons why the retention times may not be identical:
Column aging: The stationary phase of the column can degrade over time, leading to changes in the interactions between the sample molecules and the column. This can result in changes in the retention times.
Temperature variations: Small differences in the column temperature between the two runs could result in changes in the retention times, as temperature affects the strength of the interactions between the sample molecules and the stationary phase.
Injection variations: The sample injection process is not always perfectly reproducible, which could lead to variations in the retention times.
Contamination: The column and injection port can be contaminated over time with the sample or other compounds, leading to changes in the retention times.
Overall, while the retention times are expected to be similar, small variations due to these factors should be expected.
the elements and compounds present before a chemical reaction are called the ___________.
Answer:
The reactants
Explanation:
Elements that both the s and p sublevels are completely filled?
The elements of Group 18 (helium, neon, argon, krypton, xenon, and radon) are called the noble gases. They are an especially important group of the periodic table because they are almost completely unreactive, due to their completely filled outermost s and p sublevels.
What is periodic table?The chemical elements are arranged in rows and columns in the periodic table, commonly known as the periodic table of the elements.It is frequently used in chemistry, physics, and other disciplines and is frequently referred to as an icon of chemistry.All discovered chemical elements are arranged in rows (referred to as periods) and columns (referred to as groups) in the periodic table of chemical elements, also referred to as the periodic table, in ascending order of atomic number.They are arranged in rows and columns, as you will see. Periods and groups are the names given to the horizontal rows that run from left to right and the vertical columns that run from top to bottom, respectively.To learn more about periodic table refer to:
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Please help, will give brainiest
QUESTION 1.
Element X on Planet Qatar has three known isotopes: X-121 with a relative abundance of 43.2%, X-123 with a relative abundance of 53.1%, and X-129 with a relative abundance of 3.70%. What is the average atomic mass in amu of Element X given this information?
QUESTION 2.
How did Rutherford's experiment change the way scientists had previously viewed atomic structure? How did this pave the way for subsequent changes up to and including the currently accepted quantum mechanical atomic model?
QUESTION 3.
How is percent abundance related to average atomic mass?
Answer 1
The average atomic mass in a.m.u of Element X given this information is 122.358.
Answer 2
Rutherford's experiment change the way scientists had previously viewed atomic structure as it provided insight into atomic structure.
Rutherford's experiment paved the way for subsequent changes up to and including the currently accepted quantum mechanical atomic model as his model of the atom, the structure of the nucleus became more well-defined following the discovery of protons (1919) and neutrons (1932) as the particle constituents of the nucleus.
Answer 3
The percent abundance is related to the number fraction as fi = Pi/100 and used as in the formula written above in order to find average mass
What is atomic structure?Atomic structure refers to the structure of an atom comprising a nucleus (centre) in which the protons (positively charged) and neutrons (neutral) are present.
The average atomic mass in a.m.u of Element X given this information is ((121 * 43.2) + (123 * 53.1) + (129 * 3.70)) / 100
=5227.2 + 6531.3 + 477.3
=12235.8 / 100
122.358
Rutherford's experiment change the way scientists had previously viewed atomic structure as it provided insight into atomic structure, and Rutherford's model of the atom was proposed as a small, positive, massive nucleus contains the very vast majority of the mass of the entire atom with negatively charged electrons surrounding it at relatively large distances.
Rutherford's experiment paved the way for subsequent changes up to and including the currently accepted quantum mechanical atomic model as his model of the atom, the structure of the nucleus became more well-defined following the discovery of protons in 1919 and neutrons in 1932 as the particle constituents of the nucleus.
It was during the 1920s that a "wave mechanical model" came along through the work of several physicists most importantly de Broglie, Heisenberg, and Schrodinger) and Bohr's concept of electrons "orbiting" the nucleus was abandoned in favor of "orbitals" which are more abstract probabilistic representations of electronic structure within an atom.
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PLEASE ANSWER WITH A CORRECT ANSWER
Answer: Solar Energy Chemical Energy
Explanation:
The density of silver (Ag) is 10.5 g/cm^3. What Would be the mass (in grams) of a piece of silver that occupies a volume of 23.6 cm^3