Question 1

Which of the following best describes a compound?

Accepted Answer

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

Question 2

Which of the following is a heterogeneous mixture?

Accepted Answer

Mercury and hydrogen mixed together

Question 3

What is the correct formula for calculating density?

Accepted Answer

$$D = \dfrac{m}{V}$$

Question 4

A student measures the mass of a sample as $$67.23\ \mathrm{g}$$ and its volume as $$47.32\ \mathrm{mL}. $$What is the density of the sample?

Accepted Answer

$$1.42\ \mathrm{g/mL}$$

Question 5

Which of the following substances is an element?

Accepted Answer

Copper ($$\mathrm{Cu})$$

Question 6

Which process is used to measure the volume of an irregularly shaped object?

Accepted Answer

Volume displacement using water

Question 7

Which of the following is a correct conversion factor for changing inches to centimeters?

Accepted Answer

$$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$

Question 8

Which statement about acids and bases is correct?

Accepted Answer

Acids and bases react to form salt and water.

Question 9

What is the chemical formula for washing soda?

Accepted Answer

$$\mathrm{Na_2CO_3}$$

Question 10

Which of the following statements about antioxidants is true?

Accepted Answer

White substances do not contain antioxidants.

Question 11

A sample of mercury has a mass of $$13.6\ \mathrm{g}$$ and a volume of $$1\ \mathrm{mL}. $$What is its density?

Accepted Answer

$$13.6\ \mathrm{g/mL}$$

Question 12

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 13

Which of the following is a correct example of a chemical reaction between an acid and a base?

Accepted Answer

$$\mathrm{NaOH} + \mathrm{HCl} \rightarrow \mathrm{NaCl} + \mathrm{H_2O}$$

Question 14

Which of the following is used to sweeten pig swill?

Accepted Answer

Lye ($$\mathrm{NaOH})$$

Question 15

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 16

If a sample is grown under the snow in winter, how does its nutritional value compare to one grown in spring/summer?

Accepted Answer

It is more nutritious.

Question 17

Which of the following is the correct formula for table salt?

Accepted Answer

$$\mathrm{NaCl}$$

Question 18

Which of the following is a correct unit for measuring volume in chemistry?

Accepted Answer

Cubic centimeter ($$\mathrm{cm^3$})$$

Question 19

Which of the following is a correct statement about the structure of sugar and protein?

Accepted Answer

Sugar is soft, while protein is a hard-held sphere.

Question 20

Which of the following is the correct formula for baking soda?

Accepted Answer

$$\mathrm{$$NaHCO_3$$}$$

Introduction to Chemistry: Matter, Measurement, and Chemical Substances

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