Question 1

Which of the following best describes the main focus of chemistry as a science?

Accepted Answer

The study of matter and the changes it undergoes.

Question 2

Which of the following is the correct decimal representation of $$1.201 	imes 10^7$?

Accepted Answer

$$12,010,000$$

Question 3

Express the number $$0.00005210 in $$correct scientific notation.

Accepted Answer

$$5.210 	imes 10$$^{-5}$$

Question 4

In the number $$48.93$$, which digit is estimated (uncertain)?

Accepted Answer

$$3$$

Question 5

How many significant figures are in the number $$865,000$$?

Accepted Answer

$$3$$

Question 6

How many significant figures are in the number $$9.080 	imes 10^4$?

Accepted Answer

$$4$$

Question 7

Calculate $$106.92 \div 9.1 	imes 1.9$$ and report the answer with the correct number of significant figures.

Accepted Answer

$$22$$

Question 8

Calculate $$13.96 - 4.9102 + 71.5$$ and report the answer with the correct number of significant figures.

Accepted Answer

$$80.5$$

Question 9

What is the correct multiplier for the prefix pico ($$p$$)?

Accepted Answer

$$10^{-12}$$

Question 10

A sample has a mass of $$36.0120 g $$and a volume of $$20.77 mL. $$What is its density, reported with the correct number of significant figures?

Accepted Answer

$$1.734 g/mL$$

Question 11

Which of the following best describes a chemical property?

Accepted Answer

The ability of a substance to react with oxygen.

Question 12

Which of the following is an example of a physical change?

Accepted Answer

Dissolving sugar in water.

Question 13

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 14

Which of the following statements about significant figures is correct?

Accepted Answer

All nonzero digits are significant.

Question 15

A student measures the mass of a coin as $$9.99 g $$and its volume as $$0.925 mL. $$What is the density of the coin, reported with the correct number of significant figures?

Accepted Answer

$$10.8 g/mL$$

Question 16

Which of the following is the correct scientific notation for $$0.000128$$?

Accepted Answer

$$1.28 	imes 10$$^{-4}$$

Question 17

Which of the following is a chemical change?

Accepted Answer

Digesting food

Question 18

Which of the following is a pure substance?

Accepted Answer

Oxygen gas

Question 19

A patient receives a dose of $$250 mg of a $$medication. How many grams is this?

Accepted Answer

$$0.25 g$$

Question 20

Which of the following is the correct value for Avogadro's number?

Accepted Answer

$$6.022 	imes 10$$^{23}$$

General Chemistry: Measurement, Significant Figures, and Scientific Notation

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