Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more different elements that are chemically bonded together.

Question 2

Which of the following is a homogeneous mixture?

Accepted Answer

Coffee

Question 3

A sample of matter maintains a fixed shape and volume, is not easily compressible, and has low viscosity. Which state of matter is this?

Accepted Answer

Solid

Question 4

Which of the following is a physical change?

Accepted Answer

Dissolving sugar in water

Question 5

Which of the following is a chemical property of hydrogen gas?

Accepted Answer

It reacts explosively with oxygen gas.

Question 6

Which of the following is NOT a physical property?

Accepted Answer

An iron bar rusts.

Question 7

Which of the following elements is chemically most similar to sodium ($$Z = 11$$)?

Accepted Answer

Lithium ($$Z = 3)$$

Question 8

Which of the following is a metalloid?

Accepted Answer

Silicon

Question 9

Which of the following elements is a nonmetal that is solid at room temperature?

Accepted Answer

Carbon

Question 10

Which of the following exists as a liquid at room temperature ($$25^{\circ}$$\mathrm{C}$$)?

Accepted Answer

Bromine

Question 11

According to the Law of Conservation of Mass, if $$25.0\ \mathrm{g} of $$hydrogen gas reacts with $$12.0\ \mathrm{g} of $$oxygen gas, how many grams of water vapor will form?

Accepted Answer

$$37.0\ \mathrm{g}$$

Question 12

A system loses heat while doing work on the surroundings. What are the signs of $$q$$ and $$w$$?

Accepted Answer

$$q = -, w = -$$

Question 13

Which of the following represents a reversible change?

Accepted Answer

Melting a chocolate bar then re-solidifying it in the freezer.

Question 14

Which of the following is a polyatomic element?

Accepted Answer

Selenium

Question 15

Which of the following choices will have the lowest observed viscosity?

Accepted Answer

Helium gas

Question 16

Nitric acid has a melting point of $$-42^{\circ}$$\mathrm{C}$$ and a boiling point of 83$$^{\circ}$$\mathrm{C}. $$What is its physical state at $$110^{\circ}$$\mathrm{C}$$?

Accepted Answer

Gas

Question 17

Which of the following is NOT a chemical property for an unknown element?

Accepted Answer

It has a yellow-orange color.

Question 18

Which of the following represents a physical property?

Accepted Answer

Mercury is a silvery liquid at $$25^{\circ}$$\mathrm{C}$$.

Question 19

Which of the following is a representative element that is not diatomic in the 4th period and is a metalloid?

Accepted Answer

Germanium

Question 20

Which of the following best describes the process when a solid changes directly to a gas?

Accepted Answer

Sublimation

Matter and Energy: Classification, States, and Properties

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