Question 1

How many hydrogen atoms are present in 2.84 moles of water?

Accepted Answer

2.84 moles of water contain 2.84 moles of H2O molecules. Each H2O molecule contains 2 H atoms. Therefore, 2.84 moles of water contain 2.84 x 2 = 5.68 moles of H atoms. 1 mole of H atoms contains 6.022 x 10^23 atoms. Therefore, 5.68 moles of H atoms contain 5.68 x 6.022 x 10^23 = 3.42 x 10^24 atoms.

Question 2

Hydrocarbons contain only carbon and hydrogen.

Accepted Answer

Hydrocarbons are compounds made up of only carbon and hydrogen atoms.

Question 3

The number of atoms in 10.0 g of CaCO₃ (100.0 g/mol) is:

Accepted Answer

B

Question 4

Chemical nomenclature is a systematic way of assigning names to chemical compounds.

Accepted Answer

Chemical nomenclature follows specific rules and conventions to give systematic and unique names to different chemical compounds. This helps to communicate chemical information effectively and avoids confusion that can arise from using different names for the same compound.

Question 5

Organic chemistry refers to compounds of oxygen, and hydrogen.

Accepted Answer

Organic chemistry refers to compounds that contain carbon and often hydrogen as well, but not necessarily oxygen.

Question 6

Which of the following contains the greatest number of atoms?

Accepted Answer

The answer of Which of the following contains the greatest...

Question 7

Aspartame, C₁₄H₁₈N₂O₅, a low-calorie sweetener, is about 200 times sweeter than sugar. How many molecules of aspartame are there in a one-gram packet of sweetener containing 36 mg aspartame?

Accepted Answer

The answer of Aspartame, C₁₄H₁₈N₂O₅, a low-calorie sweetener, is about...

Question 8

Choose the INCORRECT statement.

Accepted Answer

The molecular mass of hydrogen (H2) is approximately 2.016 u, not 1.008 u. The value 1.008 u refers to the atomic mass of a single hydrogen atom, not the molecular mass of a hydrogen molecule.

Question 9

For an ionic compound, the term formula mass is more appropriate than the term molecular mass.

Accepted Answer

This is because ionic compounds do not have discrete molecules like covalent compounds do. Instead, they are made up of a crystal lattice of alternating positive and negative ions, so the term formula mass is more appropriate.

Question 10

Choose the INCORRECT statement.

Accepted Answer

An anion is actually a negative ion, not a positive ion.

Question 11

Polyatomic ions end in -ate or -ite.

Accepted Answer

The answer of Polyatomic ions end in -ate or -ite....

Question 12

A mole of the substance water, H₂O, refers to:

Accepted Answer

A mole refers to a specific number of particles, in this case 6.02 × 10^23 molecules of H₂O. This is option D. Option A is simply the molar mass of the compound and option B refers to a single molecule, neither of which is the definition of a mole. Option C refers to the molar mass multiplied by Avogadro's number, but this mass is not correct for water. Option E is incorrect because it only refers to the number of H and O atoms, not the whole water molecule.

Question 13

The structural formula is the simplest formula.

Accepted Answer

The molecular formula is the simplest formula, as it only gives the number and type of atoms present in a molecule. The structural formula shows the arrangement of atoms and the bonds between them.

Question 14

Only metals in binary compounds use prefixes such as di-, tri-, tetra-, etc.

Accepted Answer

Both metals and nonmetals in binary compounds use prefixes such as di-, tri-, tetra-, etc.

Question 15

A 200.0 g sample of pure MgCl₂ contains:

Accepted Answer

To find the number of formula units, first calculate the moles of MgCl2 using its molar mass (95.211 g/mol). Then multiply by Avogadro's number (6.022 × 10^23 formula units/mol) to get approximately 1.265 × 10^24 formula units.

Question 16

A 10.0 g sample of bismuth tribromide, BiBr₃, contains:

Accepted Answer

The answer of A 10.0 g sample of bismuth tribromide,...

Question 17

Oxidation state is related to the number of protons involved in bonding.

Accepted Answer

Oxidation state is related to the number of electrons lost, gained, or shared in bonding, not protons.

Question 18

A molecule is a group of bonded atoms that exist as an entity.

Accepted Answer

This statement is true. A molecule is formed when two or more atoms are chemically bonded together to form a stable entity with its own unique set of physical and chemical properties.

Question 19

Which of the following could be an empirical formula?

Accepted Answer

The answer of Which of the following could be an...

Question 20

Combustion analysis is one way to determine the simplest formula of some compounds.

Accepted Answer

Combustion analysis involves burning a compound in a controlled environment to determine the amount of carbon, hydrogen, and oxygen present in the compound, which can then be used to determine the simplest formula.

Quiz 3: Chemical Compounds

How many hydrogen atoms are present in 2.84 moles of water?

Hydrocarbons contain only carbon and hydrogen.

The number of atoms in 10.0 g of CaCO3 (100.0 g/mol) is:

Chemical nomenclature is a systematic way of assigning names to chemical compounds.

Organic chemistry refers to compounds of oxygen, and hydrogen.

Which of the following contains the greatest number of atoms?

Aspartame, C14H18N2O5, a low-calorie sweetener, is about 200 times sweeter than sugar. How many molecules of aspartame are there in a one-gram packet of sweetener containing 36 mg aspartame?

Choose the INCORRECT statement.

For an ionic compound, the term formula mass is more appropriate than the term molecular mass.

Choose the INCORRECT statement.

Polyatomic ions end in -ate or -ite.

A mole of the substance water, H2O, refers to:

The structural formula is the simplest formula.

Only metals in binary compounds use prefixes such as di-, tri-, tetra-, etc.

A 200.0 g sample of pure MgCl2 contains:

A 10.0 g sample of bismuth tribromide, BiBr3, contains:

Oxidation state is related to the number of protons involved in bonding.

A molecule is a group of bonded atoms that exist as an entity.

Which of the following could be an empirical formula?

Combustion analysis is one way to determine the simplest formula of some compounds.

The number of atoms in 10.0 g of CaCO₃ (100.0 g/mol) is:

Aspartame, C₁₄H₁₈N₂O₅, a low-calorie sweetener, is about 200 times sweeter than sugar. How many molecules of aspartame are there in a one-gram packet of sweetener containing 36 mg aspartame?

A mole of the substance water, H₂O, refers to:

A 200.0 g sample of pure MgCl₂ contains:

A 10.0 g sample of bismuth tribromide, BiBr₃, contains: