Chapter 2

Question 1

Pure Substance

Answer 1

Matter that always has exactly the same composition; an element or compound.

Question 2

Element

Answer 2

A substance that cannot be broken down into simpler substances.

Question 3

Atom

Answer 3

The smallest particle of an element.

Question 4

Compound

Answer 4

A substance that is made from two or more simpler substances and can be broken down into those simpler substances.

Question 5

Heterogeneous Mixture

Answer 5

A type of mixture in which parts of the mixture are noticeably different from one another.

Question 6

Homogeneous Mixture

Answer 6

A type of mixture in which substances are so evenly distrubted that it is difficult to distinguish one substance in the mixture from another.

Question 7

Solution

Answer 7

A mixture that forms when substances dissolve and form a homogeneous mixture.

Question 8

Suspension

Answer 8

A heterogeneous mixture that separates into layers over time.

Question 9

Colloid

Answer 9

A mixture that contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension.

Question 10

Physical Property

Answer 10

Any characteristic of a material that can be observed or measured without changing the composition of the substances in the material.

Question 11

Viscosity

Answer 11

The tendency of an object to keep from flowing; resistance to flowing.

Question 12

Conductivity

Answer 12

A material’s ability to allow heat or electric charges to flow.

Question 13

Malleability

Answer 13

The ability of a solid to be hammered into sheets without shattering.

Question 14

Melting Point

Answer 14

The temperature at which a substance changes from a solid to a liquid.

Question 15

Boiling Point

Answer 15

The temperature at which a substance boils.

Question 16

Filtration

Answer 16

A process that separates materials based on the size of their particles.

Question 17

Distillation

Answer 17

A process that separates the substances in a solution based on their boiling points.

Question 18

Physical Change

Answer 18

A change that occurs when some properties of a material change, but the substances in the material stay the same.

Question 19

Chemical Property

Answer 19

Any property that produces a change in the composition of matter.

Question 20

Flammability

Answer 20

A material’s ability to burn in the presence of oxygen.

Question 21

Reactivity

Answer 21

The property that describes how readily a substance combines chemically with another substance.

Question 22

Chemical Change

Answer 22

Change that occurs when a substance reacts and forms one or more new substances.

Question 23

Precipitate

Answer 23

A solid that forms and separates from a liquid mixture.