Question 1

A campfire, as shown in the image, involves burning wood. Which of the following best describes the type of change occurring and the evidence supporting your answer?

Accepted Answer

It is a chemical change, as new substances with different properties are formed and heat is released.

Question 2

Which physical state of matter is characterized by having a fixed volume but a variable shape?

Accepted Answer

Liquid

Question 3

Which of the following changes of state requires the removal of energy (cooling)?

Accepted Answer

Condensation and freezing

Question 4

A beaker contains a clear solution with a spoon in it (see image). Which classification best describes this sample of matter?

Accepted Answer

Homogeneous mixture

Question 5

Which of the following is a heterogeneous mixture?

Accepted Answer

Granola

Question 6

Which of the following is an example of a compound?

Accepted Answer

Copper oxide

Question 7

What is the correct symbol for the element carbon?

Accepted Answer

C

Question 8

Which of the following properties is NOT characteristic of a metal?

Accepted Answer

Reacts with other metals

Question 9

How many hydrogen atoms are present in one formula unit of $$\mathrm{Ca(C_2H_3O_2)_2}$$?

Accepted Answer

6

Question 10

Which of the following best describes the law of conservation of mass?

Accepted Answer

The mass of the reactants equals the mass of the products in a chemical reaction.

Question 11

In an experiment, 2.430 g of magnesium metal reacts with oxygen to form 4.050 g of magnesium oxide. What is the mass of oxygen that reacted? Use the law of conservation of mass.

Accepted Answer

$$4.050\ \mathrm{g} - 2.430\ \mathrm{g} = 1.620\ \mathrm{g}$$

Question 12

Which of the following is a chemical change?

Accepted Answer

Lighting a match

Question 13

Which physical state has particles with the most kinetic energy?

Accepted Answer

Gas

Question 14

Which of the following best describes a physical property?

Accepted Answer

Chlorine gas has a greenish-yellow tint.

Question 15

Which of the following best describes the law of conservation of energy?

Accepted Answer

Energy cannot be created nor destroyed, but can be converted from one form to another.

Question 16

Which of the following is a correct chemical formula for a compound containing 6 carbon, 12 hydrogen, and 6 oxygen atoms?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 17

Which of the following best describes a homogeneous mixture?

Accepted Answer

Maple syrup

Question 18

Which of the following is NOT a property of nonmetals?

Accepted Answer

Ductile

Question 19

Which law is represented by the equation $$E = mc^2$?

Accepted Answer

Law of conservation of mass and energy

Question 20

Which of the following statements about elements in the human body is correct?

Accepted Answer

Oxygen, carbon, hydrogen, and nitrogen make up about 96% of the human body.

Chapter 3: Matter and Energy – Introduction to Chemistry Study Notes

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