Question 1

Which of the following best describes a chemical property?

Accepted Answer

Iron reacts with oxygen to form rust.

Question 2

A student measures the mass of a leaf as 0.35 g. Which SI prefix multiplier is most appropriate for expressing this mass?

Accepted Answer

milligram (mg)

Question 3

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

Accepted Answer

Dissolving sugar in water.

Question 4

A chemist finds that a 30.5 g sample of a colorless liquid has a volume of 35.1 mL. What is the density of the liquid in g/mL?

Accepted Answer

$$0.870 g/mL$$

Question 5

Which of the following is NOT a sign of a chemical change?

Accepted Answer

A change in shape occurs.

Question 6

Convert $$-21.1\ ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$252.05\ \mathrm{K}$$

Question 7

Which of the following statements about density is correct?

Accepted Answer

Density is temperature dependent.

Question 8

A graduated cylinder contains 19.9 mL of water. After adding a piece of galena, the volume rises to 24.5 mL. What is the volume of the galena?

Accepted Answer

$$4.6\ \mathrm{mL}$$

Question 9

Which of the following is the correct SI base unit for measuring temperature?

Accepted Answer

Kelvin (K)

Question 10

Which of the following numbers has four significant figures?

Accepted Answer

0.004560

Question 11

A student adds $$1.234 	imes 10$$^{-3}$$ and 5.623$$ 	imes $$10^{-2}. $$What is the correct answer in scientific notation?

Accepted Answer

$$5.746 	imes 10$$^{-2}$$

Question 12

Which of the following best describes the Law of Conservation of Energy?

Accepted Answer

Energy can neither be created nor destroyed, only transferred.

Question 13

Which of the following is the correct conversion factor to change 1 inch to centimeters?

Accepted Answer

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

Question 14

Which of the following is an example of a quantitative observation?

Accepted Answer

The mass of the sample is 12.5 g.

Question 15

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 16

A sample of water is heated from 20°C to 80°C. Which of the following best describes the energy change?

Accepted Answer

The water gains thermal energy.

Question 17

Which of the following is an intensive property?

Accepted Answer

Density

Question 18

Which of the following is the correct order of operations for calculations in chemistry?

Accepted Answer

Parentheses, Exponents, Multiplication, Division, Addition, Subtraction

Question 19

Which of the following is the best example of a molecule?

Accepted Answer

NaCl

Question 20

A student multiplies $$6.02 	imes 10$$^{23}$$ by 2.32$$ 	imes $$10^{-2}. $$What is the answer in scientific notation with three significant figures?

Accepted Answer

$$1.40 	imes 10$$^{22}$$

Units of Measurement and Physical & Chemical Change: Introduction to Chemistry Study Notes

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