Question 1

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the composition is not uniform throughout.

Question 2

Which law states that mass is neither created nor destroyed in a chemical reaction?

Accepted Answer

Law of Conservation of Mass

Question 3

A scientist measures the temperature of a solution as 25°C. What is this temperature in Kelvin?

Accepted Answer

$$298 \, \mathrm{K}$$

Question 4

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

Accepted Answer

Melting of ice

Question 5

A sample of ethanol has a mass of $$46.0 \, \mathrm{g}$$ and a volume of $$58.0 \, \mathrm{mL}. $$What is its density?

Accepted Answer

$$0.79 \, \mathrm{g/mL}$$

Question 6

Which of the following is NOT a fundamental SI unit?

Accepted Answer

Liter

Question 7

Which of the following statements about energy is correct?

Accepted Answer

Energy can be converted from one form to another.

Question 8

A student records the mass of a coin as $$2.50 \, \mathrm{g}$$ and its volume as $$0.50 \, \mathrm{cm}^3. $$What is the density of the coin?

Accepted Answer

$$5.00 \, \mathrm{g/cm}^3$$

Question 9

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 10

A hospital stores oxygen gas at $$21.0^	ext{o} \mathrm{C}. $$What is this temperature in Fahrenheit?

Accepted Answer

$$69.8^	ext{o} \mathrm{F}$$

Question 11

Which of the following best describes a pure substance?

Accepted Answer

A material with a fixed composition and distinct properties.

Question 12

Which of the following is the correct formula for density?

Accepted Answer

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

Question 13

A sample of water is heated from $$20.0^	ext{o} \mathrm{C} to$$ $$80.0^	ext{o} \mathrm{C}. $$What is the change in temperature in Kelvin?

Accepted Answer

$$60.0 \, \mathrm{K}$$

Question 14

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 15

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 16

A nurse needs to prepare $$250.0 \, \mathrm{mL} of a $$saline solution. If the density of the solution is $$1.05 \, \mathrm{g/mL}$$, what is the mass of the solution?

Accepted Answer

$$262.5 \, \mathrm{g}$$

Question 17

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros between nonzero digits are significant.

Question 18

A chemist mixes $$50.0 \, \mathrm{g} of $$sugar with $$150.0 \, \mathrm{g} of $$water. What is the total mass of the mixture after dissolving?

Accepted Answer

$$200.0 \, \mathrm{g}$$

Question 19

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

Accepted Answer

$$1 \, \mathrm{cm} = 0.01 \, \mathrm{m}$$

Question 20

A student measures the mass of a beaker three times and gets $$50.1 \, \mathrm{g}$$, $$50.2 \, \mathrm{g}$$, and $$50.0 \, \mathrm{g}. $$The actual mass is $$49.8 \, \mathrm{g}. $$Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Chapter 1: Matter, Measurement, and Problem Solving – Study Notes

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