Question 1

Which of the following statements best describes a chemical compound?

Accepted Answer

A distinct substance composed of two or more elements chemically combined in fixed proportions.

Question 2

Which of the following is an example of a simple chemical compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 3

What is the empirical formula for a compound whose molecular formula is $$\mathrm{P_4O_{10}}$$?

Accepted Answer

$$\mathrm{P_2O_5}$$

Question 4

Which of the following best describes an ionic compound?

Accepted Answer

A compound made up of positive and negative ions held together by electrostatic forces.

Question 5

Which of the following is NOT a feature of all chemical compounds?

Accepted Answer

They can be separated into their elements by physical means.

Question 6

Which of the following is the correct empirical formula for glucose ($$\mathrm{C_6H_{12}O_6$}$$)?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 7

Which of the following compounds is a molecular compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 8

A student is given a sample of ascorbic acid (Vitamin C) with the molecular formula $$\mathrm{C_6H_8O_6}. $$What is its empirical formula?

Accepted Answer

$$\mathrm{C_3H_4O_3}$$

Question 9

Which of the following best explains why $$\mathrm{CO_2$} is $$classified as a simple chemical compound?

Accepted Answer

It is composed of two different elements in a fixed ratio.

Question 10

Which of the following is a correct statement about empirical formulas?

Accepted Answer

They show the simplest whole-number ratio of elements in a compound.

Question 11

A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of this compound? (Atomic masses: C = 12, H = 1, O = 16)

Accepted Answer

$$\mathrm{CH_2O}$$

Question 12

Which of the following best describes the difference between a molecular and an ionic compound?

Accepted Answer

Molecular compounds are made of discrete molecules, while ionic compounds are made of a lattice of ions.

Question 13

Which of the following is a correct example of an empirical formula?

Accepted Answer

$$\mathrm{HO}$$

Question 14

Which of the following compounds is most likely to be an ionic compound?

Accepted Answer

$$\mathrm{NaCl}$$

Question 15

A compound has the empirical formula $$\mathrm{CH_2O}$$ and a molar mass of 180 g/mol. What is its molecular formula?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Chemical Elements & Compounds: Types, Formulas, and Classification

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