Answer: Option (C) is the correct answer.
Explanation:
In a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.
Hence, in solid substances the molecules have low kinetic energy and they have fixed shape and volume.
In gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions.
Hence, gases are able to expand more rapidly as compared to liquids and solids.
Thus, we can conclude that the statement atoms of both are moving, is true about both a solid and a gas.
The urms of h2 molecules at 273k is 1.84×103m/s.part aat what temperature is urms for h21.8 times greater than this value?
The formula for calculating urms is given as:
urms = sqrt (3 R T / M)
where,
R is gas constant = 8.314 J / mol K
T is absolute temperature = ?
M is molar mass of H2 = 2 x 10^-3 kg/mol
Calculating for T:
1.8 * (1.84×10^3) = sqrt (3 * 8.314 * T / 2x10^-3)
T = 879.59 K (ANSWER)
Answer:
The temperature will be 879.59K for 21.8 times higher than this value.
Explanation:
The Equation for calculating Root Mean Square Velocity([tex]\rm U_r_m_s[/tex])
[tex]\rm \mathbf{U_r_m_s}=\sqrt\frac{3RT}{M}[/tex]
Where,
[tex]\rm \mathbf{U_r_m_s}[/tex] is Root Mean Square Velocity in m/s.
R is gas constant which is [tex]\rm \texttt{8.314 J/mol K}[/tex]
T is the temperature at Kelvin, what do we need to calculate here?
M is the molar mass of [tex]\rm H_2[/tex] which is [tex]\rm 2\times10^-^3\texttt{kg/mol}[/tex]
Now, put the value according to the equation above,
[tex]\rm 1.8 \times (1.84\times10^3)=\sqrt\frac{3 \times8.314 \times T}{2\times10^-^3} \\\rm \mathbf{T=879.59K}[/tex]
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If a liter of water has a mass of one kilogram, and a liter of mercury has a mass of 13.6 kilograms, which is more dense and why
Density is the amount of matter within a given amount of space.
Water has a density of 1.0 gram per centimeter squared.
Mercury has a density of 13.6 grams per centimeter squared.
Thus, within the same volume, mercury has more mass than water. Thus, mercury has a higher density.
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Mercury is more denser than water.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the substance ÷volume of substance
From above formula we can see that density is directly proportional to mass of substances at constant volume.
The volume of water and mercury is same that is 1 liter. Since the mass of mercury that is 13.6 kilograms is more than mass of water that is 1 kilogram. So, the density of mercury is more than the density of water which means mercury is denser than water.
Therefore mercury is more denser than water.
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A flashbulb contains magnesium and oxygen before use and magnesium oxide afterward, but its mass does not change.
This is an example of law of conservation of mass, which states that the total quantity of mass doesn't change means, in an isolated system mass is neither created nor destroyed by any chemical reactions or physical transformations.
According to law of mass conservation in a chemical reaction:
Mas of the Products = Mass of the Reactants
A ray in the emission spectrum has a wavelength of 3.10 x 1014 meters. Given that the speed of light is 2.998 x 108 m/s, what is the frequency of the ray?
A.0.967 x 10-6 HZ
B.9.2938 x 10-7 HZ
C.0.967 x 10-5 HZ
D.9.2938 x 107 HZ
Concepts to Understand (Give an example of each):
1. Significant figures
2. How to convert Celsius to Fahrenheit
3. How to convert Fahrenheit to Celsius
4. Metric prefixes
5. How to calculate density
6. Branches of Chemistry
Please help thank you very much.
What is the approximate percentage of corn syrup that would make an isotonic solution for the egg?
Arrange the orbitals in the order in which they fill and indicate the maximum number of electrons each can hold.
Answer:
Explanation:
We can fill maximum two electrons in one orbital. The s subshell has 1 orbital that can filled upto two electrons, the p subshell has 3 orbitals that can filled upto six electrons, the d subshell has 5 orbitals that can filled upto ten electrons, the f subshell has 7 orbitals that can filled upto fourteen electrons.
According to the energy level diagram, the 2p, 3p, 4p each can hold 6 electrons because they have 3 orbitals, and 3d, 4d each can hold 10 electrons because they have 5 orbitals, the 5f, 6f, each can hold 14 electrons because they have 7 orbitals. Therefore, the maximum number of electrons would be present in f subshell or 6f orbital.
Sodium nitrate and lead (ii) acetate express your answer as a chemical equation. identify all of the phases in your answer. enter noreaction if no no reaction occurs.
Sodium nitrate and lead (II) acetate both dissolve in water and do not react with each other; thus, there is no reaction and no precipitate is formed.
Explanation:The student is inquiring about the chemical reaction that occurs when solutions of sodium nitrate and lead (II) acetate are mixed. When mixing these two compounds, there is no reaction because both sodium nitrate and lead (II) acetate are soluble in water. As such, no precipitate forms, and the ions remain in solution. Therefore, the correct response to this question is that no reaction occurs.
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Classify each example as an element a compound a heterogeneous mixture or a homogeneous mixture a pure drinking water
Substances are classified based on their chemical composition into elements (e.g., gold), compounds (e.g., salt, pure water, carbon dioxide), homogeneous mixtures (e.g., salt water, pure air), and heterogeneous mixtures (e.g., soil, bronze).
Explanation:Classification of SubstancesSubstances can be classified into four main categories based on their chemical composition: elements, compounds, homogeneous mixtures, and heterogeneous mixtures. The classification for each of the given substances is as follows:
Salt (sodium chloride): CompoundPure water (H2O): CompoundSoil: Heterogeneous mixtureSalt water: Homogeneous mixture (solution)Pure air: Homogeneous mixture (solution)Carbon dioxide (CO2): CompoundGold (Au): ElementBronze: Heterogeneous mixtureAn element is a pure substance that cannot be broken down into simpler substances. A compound is a pure substance that consists of two or more elements chemically combined in a fixed ratio. A homogeneous mixture, or solution, has uniform composition throughout, whereas a heterogeneous mixture has a composition that varies from point to point.
Which statements accurately describe the polarity and electronegativity of water?
Element that has two isotopes has an average atomic mass of 199.7. if 75.56% of the atoms of the element have an atomic mass of 197.4, what is the atomic mass of the other isotope?
In a chemical reaction sodium and chlorine react to form sodium chloride. Which term names the sodium?
The element "um" is what type of word element?
What subatomic particle is most involved in making chemical bonds?
Over time coral buried by sediments can turn into
What experimental evidence did thomson use to support his hypothesis that atoms of all elements are made up of even smaller, charged particles?
Answer is: Identical particles were produced no matter which metal he used.
J.J. Thomson placed two oppositely charged electric plates around the cathode ray. He did experiments using different metals as electrode materials and found that the properties of the cathode ray remained constant no matter what cathode material he used.
Tomson concluded that atoms are divisible and that the corpuscles are their building blocks (atoms are made up of smaller particles).
J. J. Thomson discovered the electron in 1897.
His "plum pudding" model (1904) suggested: the electrons are embedded in the positive charge.
With this model, he abandoned his earlier hypothesis (the atom was composed of immaterial vortices).
Is wood a homogeneous or heterogeneous mixture?
Wood is a heterogeneous mixture due to its composition of various easily distinguishable components such as cellulose fibers and lignin.
Explanation:Wood is considered a heterogeneous mixture because it is composed of different components that can be easily distinguished. These components include cellulose fibers, lignin, and extracts such as resins and oils. The presence of knots, grain patterns, and different colors in wood further supports its classification as a heterogeneous mixture.
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____ is a set of rules that describes how atoms and subatomic particles behave.
What are the different ways to represent compounds? check all that apply. check all that apply. the kolbe formula a structural formula a ball model an empirical formula a space-filling model a molecular formula a ball and stick model a cylindric model?
Compounds can be exemplified in two main ways. These are Chemical Formula and Molecular Model.
Chemical formula includes:
Structural formula – this is a formula that shows the arrangement of atoms in the molecule of a compound.
Molecular formula – this is a formula giving the number of atoms of each elements to present in one molecule of a specific compound.
Empirical formula – this is a formula giving the proportions of elements present in a compound.
Molecular model:
Space-filling model - represents atoms fill the space between each other.
Ball and stick model - represents atoms as balls and chemical bonds as sticks.
Remember that a compound is a substance that is formed when two or more elements are bonded together.
Compounds can be represented in several ways including Molecular Formulas, Empirical Formulas, Structural Formulas, Ball-and-Stick Models, and Space-Filling Models. Each method provides different levels of detail and helps us understand the composition and structure of chemical compounds.
Explanation:Compounds can be represented in several ways: Molecular Formulas, Empirical Formulas, Structural Formulas, Ball-and-Stick Models, and Space-Filling Models.
Molecular formulas use chemical symbols and subscripts to indicate the exact numbers of different atoms in a molecule or compound. For instance, the molecular formula for water is H2O, indicating there are two hydrogen atoms and one oxygen atom.
Empirical formulas give the simplest whole-number ratio of atoms in a compound. For water, the empirical formula would still be H2O.
Structural formulas indicate the bonding arrangement of the atoms in the molecule, giving more detailed information about the molecule's structure.
Ball-and-stick models show the geometric arrangement of the atoms in a molecule with atomic sizes not to scale. These models often use balls to represent atoms and sticks to represent chemical bonds.
Lastly, Space-filling models also show the geometric arrangement of atoms, but in these models, the relative sizes of the atoms are represented accurately and the model gives a more realistic view of the molecule's shape.
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If 40.0 g S is allowed to react as completely as possible with 150.0 g F2(
g., what mass of the excess reactant is left?
To calculate the mass of the excess reactant remaining, we need to find the limiting reactant and use stoichiometry. In this case, the mass of the excess reactant (F2) that is left is 78.86 g.
Explanation:To determine the mass of the excess reactant left, we need to first calculate the amount of S that reacts completely with F2. We can do this by using stoichiometry and the balanced chemical equation. The balanced equation for the reaction between S and F2 is:
2S + 3F2 → 2SF6
From the equation, we can see that 2 moles of S react with 3 moles of F2. We can convert the given masses of S and F2 to moles using their molar masses:
Molar mass of S: 32.06 g/molMolar mass of F2: 38.00 g/molUsing these molar masses, we can calculate the number of moles of S and F2:
Number of moles of S = (40.0 g S) / (32.06 g/mol S) = 1.248 mol SNumber of moles of F2 = (150.0 g F2) / (38.00 g/mol F2) = 3.947 mol F2Since the reaction is 2:3, we can calculate the limiting reactant and the amount of excess reactant remaining. Since we have more F2 than needed, S is the limiting reactant and F2 is in excess.
To calculate the mass of the excess reactant remaining, we need to know how much F2 reacted completely with the S. We can do this by using the stoichiometric ratio:
Calculate the moles of F2 reacting with S: (1.248 mol S) × (3 mol F2 / 2 mol S) = 1.872 mol F2Calculate the mass of F2 reacting with S: (1.872 mol F2) × (38.00 g/mol F2) = 71.14 g F2Calculate the mass of excess reactant remaining: (150.0 g F2) - (71.14 g F2) = 78.86 g F2Therefore, the mass of the excess reactant (F2) that is left is 78.86 g.
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What choice is not a characteristic of a catalyst?
Or most atoms, a stable configuration of electrons is attained when the atom __________.
If 6.00 g of the unknown compound contained 0.200 mol of C and 0.400 mol of H, how many moles of oxygen, O, were in the sample?
Convert moles to mass.
mass C = 0.2 mol * 12 g / mol = 2.4 g
mass H = 0.4 mol * 1 g / mol = 0.4 g
So mass left for O = 6 g – (2.4 g + 0.4 g) = 3.2 g
Calculating for moles O given mass:
moles O = 3.2 g / (16 g / mol) = 0.2 moles
Answer:
0.2 moles O
Answer : The moles of oxygen present in the sample is, 0.2 moles
Explanation : Given,
Moles of carbon = 0.200 mole
Moles of hydrogen = 0.400 mole
Mass of unknown compound = 6.00 g
Molar mass of carbon = 12 g/mole
Molar mass of hydrogen = 1 g/mole
Molar mass of oxygen = 16 g/mole
First we have to calculate the mass of carbon and hydrogen.
[tex]\text{Mass of carbon}=\text{Moles of carbon}\times \text{Molar mass of carbon}=(0.200mole)\times (12g/mole)=2.4g[/tex]
[tex]\text{Mass of hydrogen}=\text{Moles of hydrogen}\times \text{Molar mass of hydrogen}=(0.400mole)\times (1g/mole)=0.4g[/tex]
Now we have to calculate the mass of oxygen.
Total mass of unknown compound = Mass of carbon + Mass of hydrogen + Mass of oxygen
6.00 = 2.4 + 0.4 + Mass of oxygen
Mass of oxygen = 3.2 grams
Now we have tom calculate the moles of oxygen.
[tex]\text{Moles of oxygen}=\frac{\text{Mass of oxygen}}{\text{Molar mass of oxygen}}=\frac{3.2g}{16g/mole}=0.2moles[/tex]
Therefore, the moles of oxygen present in the sample is, 0.2 moles
A substance that cannot be broken down into simpler substances by chemical or physical means is called a
Explanation:
An element is a substance that is made up of only one type of atoms. It cannot be broken down into simpler substances.
For example, sodium, aluminium, nickel etc are all elements.
Whereas when two or more different elements combine together then it results in the formation of a compound.
For example, [tex]MgCl_{2}[/tex] is a compound.
Therefore, we can conclude that a substance that cannot be broken down into simpler substances by chemical or physical means is called an element.
A substance that cannot be broken down into simpler substances by any chemical or physical means is called a: chemical element.
A chemical element can be defined as a pure substance that comprises atoms having the same atomic number (number of protons) in its nuclei and as such it is the primary constituent of matter.
Basically, a chemical element is a pure substance that can't be broken down, decomposed or transformed by into simpler substances chemical or physical means.
In Chemistry, some examples of a chemical element include the following:
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What mass of ammonium chloride should be added to 2.45 l of a 0.165 m nh3 in order to obtain a buffer with a ph of 9.50?
To create a buffer with a pH of 9.50 using 2.45 L of 0.165 M [tex]NH_3[/tex], approximately 38.5 grams of ammonium chloride must be added, as calculated using the Henderson-Hasselbalch equation and considering the molar mass of [tex]NH_4Cl[/tex].
To calculate the mass of ammonium chloride (NH4Cl) needed for a buffer solution with a desired pH, we use the Henderson-Hasselbalch equation: pH = pKa + log([Base]/[Acid]). Ammonium chloride, when dissolved, provides the ammonium ion ([tex]NH_4^+[/tex]), which acts as the acid in this buffer system, whereas ammonia ([tex]NH_3[/tex]) acts as the base.
First, we need to find the pKa of [tex]NH_3[/tex], which is the negative logarithm of the dissociation constant (Ka) of its conjugate acid, [tex]NH_4^+[/tex]. If the pKa of [tex]NH_3[/tex] is 9.25, then using the desired pH of 9.50, we can set up the equation as follows:
[tex]pH = 9.25 + log(\frac{[NH_3]}{[NH_4^+]})[/tex]
[tex]9.50 = 9.25 + log(\frac{[0.165 M]}{[NH_4^+]})[/tex]
Solving for [[tex]NH_4^+[/tex]], we find that:
[tex]log(\frac{[NH_4^+]}{0.165}) = 9.50 - 9.25[/tex]
[tex]log(\frac{[NH4+]}{0.165}) = 0.25[/tex]
[tex][NH_4^+] = 10^{0.25} [NH_4^+] = 1.778 \frac{[NH4+]}{0.165} = 1.778[/tex]
[tex][NH_4^+] = 0.293 M[/tex]
Now, to find the mass of NH4Cl required, we use the formula:
mass = molarity volume molar mass
mass = (0.293 M) (2.45 L) (53.491 g/mol)
mass = 38.511 g (rounded to three significant figures)
Therefore, to prepare a buffer solution with a pH of 9.50 using a 2.45 L solution of 0.165 M [tex]NH_3[/tex], you must add approximately 38.5 grams of [tex]NH_4Cl[/tex].
calculate the average atomic mass for neon if its abundance in nature is 90.5% neon-20, 0.3% neon-21, and 9.2% neon-22
Answer: 20.187 amu
Explanation:
20(0.905)+21(0.003)+22(0.092)
The density of silver is 10.5 g/cm3. what volume would a piece of silver with a mass of 54.5 g occupy?
An atom of gold has a mass of 3.271 x 10^-22g. how many atoms of gold are in 5.00g of gold?
Answer:
number of gold atoms = [tex]1.528X10^{22}[/tex]
Explanation:
The mass of one atom of gold is given to be = [tex]3.271X10^{-22}[/tex]
The mass of gold is given to be = [tex]5.00g[/tex]
In order to determine the number of atoms present in the 5 g of gold, we will divide the mass of the gold with the mass of each atom of the gold.
the number of atoms = [tex]\frac{massofgold}{massofatom}=\frac{5}{3.271X10^{-22}} =1.528X10^{22}[/tex]
Thus number of gold atoms = [tex]1.528X10^{22}[/tex]
When nitrogen and tin (sn4+) form an ionic compound, what is the formula? n3sn4 sn4n3 sn3n4 n4sn3?
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