Question 1

Which of the following best describes a hypothesis in the scientific method?

Accepted Answer

A tentative explanation that can be tested by experiments or observations.

Question 2

A student measures the mass of a sample as $$8.623 	imes 10^2$ g. Which of the following shows the correct number of significant figures?

Accepted Answer

4 significant figures

Question 3

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

Accepted Answer

Burning of wood

Question 4

A cube has dimensions of $$10.0 \, 	ext{in} 	imes 10.0 	ext{ in} 	imes 10.0 	ext{ in}. $$Given that there are four quarts in a gallon and one gallon is $$3.785 	ext{ L}$$, what is the volume of the cube in $$	ext{L}$$?

Accepted Answer

$$16.4 	ext{ L}$$

Question 5

Which of the following statements about matter is FALSE?

Accepted Answer

Matter can be created and destroyed.

Question 6

Which of the following is a mixture?

Accepted Answer

Salt water

Question 7

A student finds a shiny rock that they suspect is gold. They weigh the rock on a balance and determine the mass is $$38.6 	ext{ g}. $$The rock displaces $$2.00 	ext{ mL} of $$water in a graduated cylinder. What is the density of the rock?

Accepted Answer

$$19.3 	ext{ g/mL}$$

Question 8

Which of the following is the correct SI base unit for length?

Accepted Answer

Meter

Question 9

Which of the following is an example of an observation?

Accepted Answer

A scientist notes that a chemical turns blue when heated.

Question 10

Which of the following is a physical property?

Accepted Answer

Density

Question 11

A sample of gold has a mass of $$19.3 	ext{ g}$$ and displaces $$1.00 	ext{ mL} of $$water. What is the density of gold?

Accepted Answer

$$19.3 	ext{ g/mL}$$

Question 12

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen

Question 13

Which of the following is a pure substance?

Accepted Answer

Hydrogen gas

Question 14

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

Accepted Answer

Sand and iron filings

Question 15

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

Accepted Answer

Boiling water

Question 16

Which of the following is an example of a compound?

Accepted Answer

Water

Question 17

Which of the following is a correct statement about energy?

Accepted Answer

Energy is conserved in all physical and chemical changes.

Question 18

A scientist combines $$5.0 	ext{ g} of $$potassium with $$12.7 	ext{ g} of $$chlorine to form potassium chloride. What is the total mass of potassium chloride formed?

Accepted Answer

$$17.7 	ext{ g}$$

Question 19

Convert $$25.0^\circ 	ext{C} to $$Kelvin.

Accepted Answer

$$298.2 	ext{ K}$$

Question 20

Which of the following is a correct conversion factor for converting Celsius to Kelvin?

Accepted Answer

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

Introduction to Chemistry: Measurement, Matter, and Problem Solving – Study Notes

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