Science chapter 2

Question 1

pure substance

Answer 1

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

Question 2

atom

Answer 2

the smallest particle of an element

Question 3

solution

Answer 3

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

Question 4

physical property

Answer 4

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

Question 5

compound

Answer 5

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

Question 6

colloid

Answer 6

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

Question 7

heterogeneous mixture

Answer 7

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

Question 8

chemical property

Answer 8

any property that produces a change in the composition of matter

Question 9

conductivity

Answer 9

a materials ability to allow heat or electric charges to flow

Question 10

melting point

Answer 10

the temperature at which a substance changes from solid to liquid

Question 11

malleability

Answer 11

the ability of a solid to be hammered without shattering

Question 12

filtration

Answer 12

a process that separates materials based on the size of their particles

Question 13

viscosity

Answer 13

the tendency of a liquid to keep from flowing; resistant to flowing

Question 14

physical change

Answer 14

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

Question 15

reactivity

Answer 15

the property that describes how readily a substance combines chemically with other substances

Question 16

precipitate

Answer 16

a solid that forms and separates from a liquid mixture

Question 17

flammability

Answer 17

a materials ability to burn in the presence of oxygen

Question 18

suspension

Answer 18

a heterogenous mixture that separates into layers over time

Question 19

Boiling point

Answer 19

the temperature at which a substance boils; the temperature at which vapor pressure is equal to atmospheric pressure

Question 20

element

Answer 20

a substance that cannot be broken down into simpler substances

Question 21

distillation

Answer 21

a process that separates the substances in a solution based on their boiling point

Question 22

chemical change

Answer 22

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

Question 23

homogeneous mixture

Answer 23

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