Question 1

Which statement best explains why the properties of sodium chloride (NaCl) differ dramatically from those of its constituent elements, sodium and chlorine?

Accepted Answer

NaCl is a compound formed by a chemical reaction, resulting in a new substance with properties distinct from its elements.

Question 2

Which of the following is the correct empirical formula for hydrogen peroxide, given its molecular formula is $$\mathrm{H_2O_2}$$?

Accepted Answer

$$\mathrm{HO}$$

Question 3

What type of chemical bond is formed between sodium and chlorine in sodium chloride?

Accepted Answer

Ionic bond

Question 4

Which of the following compounds is classified as a molecular compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 5

Given the formula $$\mathrm{$$CaCl_2$$}$$, what is the correct name for this compound?

Accepted Answer

Calcium chloride

Question 6

Which of the following is the correct formula for the ionic compound formed between aluminum and oxygen?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 7

What is the systematic name for $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 8

Which of the following best describes a polyatomic ion?

Accepted Answer

A group of covalently bonded atoms with an overall charge

Question 9

What is the correct name for $$\mathrm{$$NaNO_2$$}$$?

Accepted Answer

Sodium nitrite

Question 10

Which of the following is the correct formula for magnesium sulfate heptahydrate?

Accepted Answer

$$\mathrm{$$MgSO_4$$ \cdot 7H_2O}$$

Question 11

Which prefix is used to indicate five water molecules in a hydrate?

Accepted Answer

Penta-

Question 12

What is the correct name for the molecular compound $$\mathrm{N_2O_4}$$?

Accepted Answer

Dinitrogen tetroxide

Question 13

Which of the following is a correct statement about the naming of binary molecular compounds?

Accepted Answer

Prefixes are used only for molecular compounds to indicate the number of atoms of each element.

Question 14

Which of the following is the correct formula for chromium(III) bromide?

Accepted Answer

$$\mathrm{$$CrBr_3$$}$$

Question 15

A compound contains 40% sulfur and 60% oxygen by mass. What is its empirical formula? (Atomic masses: S = 32, O = 16)

Accepted Answer

$$\mathrm{SO_2$}$$

Question 16

Which of the following is the correct name for $$\mathrm{$$CuSO_4$$ \cdot 5H_2O}$$?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 17

Which of the following is an example of a Type II ionic compound?

Accepted Answer

$$\mathrm{$$FeCl_3$$}$$

Question 18

What is the correct name for $$\mathrm{P_2O_5}$$?

Accepted Answer

Diphosphorus pentoxide

Question 19

Which of the following is the correct formula for barium chloride hexahydrate?

Accepted Answer

$$\mathrm{$$BaCl_2$$ \cdot 6H_2O}$$

Question 20

Which of the following is the correct name for $$\mathrm{NO_2$}$$?

Accepted Answer

Nitrogen dioxide

Molecules and Compounds - Definitions, Properties, and Nomenclature

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