Question 1

Which of the following statements best describes a chemical property?

Accepted Answer

Copper reacts with oxygen to form copper oxide.

Question 2

A student measures the mass of a leaf as 0.45 g. Which SI base unit and prefix multiplier should be used to express this measurement?

Accepted Answer

g (gram)

Question 3

Which of the following changes is a chemical change?

Accepted Answer

Iron rusting when exposed to air.

Question 4

A pediatrician prescribes 75 mg of amoxicillin per kg of body mass per day, divided into two doses. If a child weighs 28 lbs and the liquid contains 125 mg/mL, how many mL should be administered per dose? (1 kg = 2.205 lbs)

Accepted Answer

3.8 mL

Question 5

Which of the following is the correct scientific notation for the number 54095 with the appropriate number of significant figures?

Accepted Answer

$$5.4095 	imes 10^4$

Question 6

A piece of aluminum foil, 22.8 cm on each side, weighs 2.56 g. If the density of aluminum is 2.70 g/mL, what is the thickness of the foil in millimeters?

Accepted Answer

$$0.0456 mm$$

Question 7

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

Accepted Answer

The temperature increased by $$5.0^{\circ}C$.

Question 8

Convert 21.1°C to Kelvin.

Accepted Answer

$$294.25 K$$

Question 9

A chemist determines the density of a liquid by pouring 30.5 g into a graduated cylinder and measuring the volume as 37.6 mL. Which substance is it most likely to be?

Accepted Answer

Isopropyl alcohol ($$0.785 g/mL)$$

Question 10

Which of the following is an extensive property?

Accepted Answer

Mass

Question 11

A tennis ball with a mass of 58.0 g is served at a speed of 128.6 mph ($$57.5 m/s). $$What is its kinetic energy in Joules? Use $$KE = \frac{1}{2}mv^2$.

Accepted Answer

$$95.6 J$$

Question 12

Which of the following statements is true regarding the law of conservation of mass?

Accepted Answer

The total mass of reactants equals the total mass of products.

Question 13

Which temperature scale is based on the average kinetic energy of particles?

Accepted Answer

Kelvin

Question 14

Which of the following numbers has three significant figures?

Accepted Answer

0.0090

Question 15

Convert 5.70 L to cubic inches. (1 mL = 1 cm$$^3$$, 1 inch = 2.54 cm)

Accepted Answer

$$347.8 in$^3$$

Question 16

Which of the following is the correct conversion of 36.2 miles per gallon to kilometers per liter? (1 mile = 1.609 km, 1 gallon = 4 quarts, 1 L = 1.057 quarts)

Accepted Answer

$$15.4 km/L$$

Question 17

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

Accepted Answer

Evaporation of water.

Question 18

Express the average body temperature of a person, 98.6°F, in Kelvin.

Accepted Answer

$$310.15 K$$

Question 19

Which of the following is the correct answer for converting 2,340 into scientific notation to the correct number of significant figures?

Accepted Answer

$$2.34 	imes 10^3$

Question 20

Which of the following is an intensive property?

Accepted Answer

Density

Chapter 1: Units of Measurement, Physical and Chemical Change – Chemistry: A Molecular Approach

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