Ch.2 Vocab

Question 1

matter that always has exactly the same composition

Answer 1

pure substance

Question 2

a substance that cannot be broken down into simpler substances

Answer 2

element

Question 3

the smallest particle of an element

Answer 3

atom

Question 4

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

Answer 4

compound

Question 5

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

Answer 5

heterogeneous mixture

Question 6

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

Answer 6

homogeneous mixture

Question 7

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

Answer 7

solution

Question 8

a heterogeneous mixture that seperates into layers over time

Answer 8

suspension

Question 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

Answer 9

colloid

Question 10

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

Answer 10

physical property

Question 11

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

Answer 11

viscosity

Question 12

a material’s ability to allow heat or electric charges to flow

Answer 12

conductivity

Question 13

the ability of a solid to be hammered without shattering

Answer 13

malleability

Question 14

the temperature at which a substance changes from a solid to liquid

Answer 14

melting point

Question 15

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

Answer 15

boiling point

Question 16

a process that seperatesmaterials based on the size of their properties

Answer 16

filtration

Question 17

a process that seperates the substances in a solution based on their boiling points

Answer 17

distillation

Question 18

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

Answer 18

physical change

Question 19

any property that produces a change in the composition of matter

Answer 19

chemical property

Question 20

a material’s ability to burn in the presence of oxygen

Answer 20

flammability

Question 21

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

Answer 21

reactivity

Question 22

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

Answer 22

chemical change

Question 23

a solid that forms and seperates from a liquid mixture

Answer 23

precipitate