Unit 1: 1.1: Classification of Matter

Question 1

The study of the interaction of matter and energy and the changes that matter undergoes.

Answer 1

chemistry

Question 2

Anything that has mass and occupies space.

Answer 2

matter

Question 3

A substance that cannot be broken down into simpler substances by chemical means; one of the basic building blocks of which all matter is composed.

Answer 3

element

Question 4

A single particle of any element- the smallest possible amount of an element that retains the properties of that element.

Answer 4

atom

Question 5

An attraction between any two atoms that holds them together.

Answer 5

chemical bond

Question 6

A chemical combination of elements that has a definite composition and its own set of properties.

Answer 6

compound

Question 7

The given ratio by mass of each element in a compound to any other element in the compound.

Answer 7

definite composition

Question 8

A substance in which all of the particles that make up that substance are of exactly the same kind. Elements and compounds are examples of this.

Answer 8

pure substance

Question 9

A physical combination of substances that has a nondefinite composition and properties characteristic of its components.

Answer 9

mixture

Question 10

A physical combination of substances that is not uniform throughout, so different samples taken from the same mixture might have different compositions from one another.

Answer 10

heterogeneous mixture

Question 11

A physical combination of substances that is uniform throughout, so different samples taken from the same mixture always have identical compositions; a solution.

Answer 11

homogenous mixture

Question 12

A homogenous mixture.

Answer 12

solution

Question 13

A homogenous mixture of a pure substance dissolved in water.

Answer 13

aqueous solution

Question 14

The percentage of carbon in a small box of the pure substance sucrose (table sugar) is 42.1%. Is sucrose an element or a compound?

Answer 14

compound- it contains more than one element

Question 15

The percentage of carbon in a small box of the pure substance sucrose (table sugar) is 42.1%. What is the percentage of carbon in a large box of sucrose?

Answer 15

42.1% carbon because a given compound always contains the same percentage of each of its elements.

Question 16

Determine whether the following mixtures are homogenous or heterogenous.
a. Mud (a mixture of dirt and water that settles over time.
b. Carbonated water before the bottle is opened (a mixture of water and carbon dioxide)
c. Carbonated water immediately after the bottle is opened.

Answer 16

a. mud is heterogenous
b. Before the bottle is opened, you cannot see the bubbles, which suggests a homogenous mixture.
c. Immediately after opening the bottle, the gas bubbles can be seen within the liquid, which suggests a heterogenous mixture.

Question 17

If you stir a teaspoon of sugar into a glass of water and a teaspoon of mud into another glass of water, the sugar will eventually dissolve into the water, but the mud will not. Which mixture is a solution?

Answer 17

The sugar forms a solution, a homogenous mixture with the water.

Question 18

When iodine (a purple solid) is added to ethyl alcohol (a colorless liquid), a uniform, transparent liquid mixture with a brown color is formed. Is the iodine-ethyl alcohol mixture homogenous or heterogenous?

Answer 18

The mixture is homogenous because it is uniform in composition.

Question 19

True or False: Every compound is a pure substance

Answer 19

true

Question 20

True or False: Every compound contains two or more elements.

Answer 20

true

Question 21

True or False: Every mixture contains two or more compounds.

Answer 21

false; mixtures may contain elements or compounds or both

Question 22

True or False: Every pure substance is a compound.

Answer 22

false; some pure substances, such as oxygen gas, are elements

Question 23

True or False: all mixtures are homogenous.

Answer 23

false; some mixtures, such as iron metal and solid sulfur, are heterogenous

Question 24

True or False: Every mixture contains two or more elements

Answer 24

true; although the elements may be combined into compounds

Question 25

True or False: All mixtures are heterogenous.

Answer 25

false; some mixtures, such as table salt and water, are homogenous

Question 26

True or False: Every pure substance contains two or more elements.

Answer 26

false; a pure substance may be a single element, such as gold

Question 27

True or False: all homogenous samples are solutions.

Answer 27

false; all homogenous mixtures are solutions, but not all homogenous samples are mixtures. Pure substances are homogenous, but they are not solutions