Q: Convert 0.348 kg of sodium hydrogen carbonate to milligrams.

$$0.348\ \mathrm{kg} \times \frac{10^6$\ \mathrm{mg}}{1\ \mathrm{kg}} = 3.48 \times 10^5$\ \mathrm{mg}$$

Q: A student wants to convert 8.00 meters to inches. Which conversion factors should be used in the correct order?

$$8.00\ \mathrm{m} \times \frac{100\ \mathrm{cm}}{1\ \mathrm{m}} \times \frac{1\ \mathrm{in}}{2.54\ \mathrm{cm}}$$

Q: A woman has a mass of 115 lb. What is her mass in grams? (1 lb = 453.6 g)

$$115\ \mathrm{lb} \times \frac{453.6\ \mathrm{g}}{1\ \mathrm{lb}} = 5.22 \times 10^4$\ \mathrm{g}$$

Question 1

Which of the following statements best describes the Law of Constant Composition?

Accepted Answer

A compound is always made up of elements in the same proportion by mass.

Question 2

A sample of galena (lead sulfide) weighs 12.4 g and has a volume of 1.64 cm$$^3. $$What is its density?

Accepted Answer

$$d = \frac{12.4\ \mathrm{g}}{1.64\ \mathrm{cm}^3} = 7.56\ \mathrm{g/cm}^3$$

Question 3

Which of the following is an example of an intensive property?

Accepted Answer

Temperature

Question 4

Which separation technique would be most appropriate to separate a homogeneous mixture of ethanol and water?

Accepted Answer

Distillation

Question 5

A student measures the mass of a liquid as 14.0 g and its volume as 102.4 mL. What is the density of the liquid, reported to the correct number of significant figures?

Accepted Answer

$$d = \frac{14.0\ \mathrm{g}}{102.4\ \mathrm{mL}} = 0.137\ \mathrm{g/mL}$$

Question 6

Which of the following is NOT a physical change?

Accepted Answer

Burning of wood

Question 7

A mixture of sand and iron filings can be separated by:

Accepted Answer

Using a magnet

Question 8

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in definite proportions.

Question 9

Convert 0.348 kg of sodium hydrogen carbonate to milligrams.

Accepted Answer

$$0.348\ \mathrm{kg} 	imes \frac{10^6$\ \mathrm{mg}}{1\ \mathrm{kg}} = 3.48 	imes 10^5$\ \mathrm{mg}$$

Question 10

Which of the following is a correct statement about significant figures?

Accepted Answer

Zeros between nonzero digits are significant.

Question 11

A student wants to convert 8.00 meters to inches. Which conversion factors should be used in the correct order?

Accepted Answer

$$8.00\ \mathrm{m} 	imes \frac{100\ \mathrm{cm}}{1\ \mathrm{m}} 	imes \frac{1\ \mathrm{in}}{2.54\ \mathrm{cm}}$$

Question 12

Which of the following is a chemical change?

Accepted Answer

Electrolysis of water

Question 13

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 14

Which of the following is the correct relationship for converting Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 15

A woman has a mass of 115 lb. What is her mass in grams? (1 lb = 453.6 g)

Accepted Answer

$$115\ \mathrm{lb} 	imes \frac{453.6\ \mathrm{g}}{1\ \mathrm{lb}} = 5.22 	imes 10^4$\ \mathrm{g}$$

Question 16

Which of the following is true about the Law of Conservation of Mass?

Accepted Answer

In a non-nuclear chemical reaction, mass is conserved.

Question 17

Which of the following is a correct example of scientific notation for the number 0.000000789?

Accepted Answer

$$7.89 	imes 10$$^{-7}$$

Question 18

Which of the following is NOT a pure substance?

Accepted Answer

Gasoline

Question 19

Which property can be used to identify a substance regardless of the amount present?

Accepted Answer

Intensive property

Question 20

Which of the following best describes the movement of particles in a gas?

Accepted Answer

Random movement

Chapter 1: Introduction to Matter and Measurement

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