CH 1: Matter, Energy and Measurement

Question 1

Chemistry

Answer 1

study of the composition, structure, properties, and changes of matter.

Question 2

Matter

Answer 2

the physical material of the universe

Question 3

Property

Answer 3

any characteristic that allows us to recognize a particular type of matter and to distinguish it from other types

Question 4

Elements

Answer 4

the 100 substances matter is comprised of

Question 5

atoms

Answer 5

the infinitesimally small building blocks of matter

Question 6

molecules

Answer 6

two or more atoms joined in specific shapes

Question 7

states of matter

Answer 7

gas, liquid, solid

Question 8

gas

Answer 8

no fixed volume or shape.. uniformly fills its container

Question 9

liquid

Answer 9

distinct volume independent of container, assumes shape of container it occupies, not compressible to any appreciable extent

Question 10

solid

Answer 10

definite shape and volume not compressible to any appreciable extent

Question 11

pure substance

Answer 11

matter that has distinct properties and composition that doesn’t vary from sample to shape

Question 12

elements

Answer 12

substances that cannot be decomposed into simpler substances.

Question 13

compounds

Answer 13

substances composed of two or more elements

Question 14

mixtures

Answer 14

comes of two or more substances. each substance retains its chemical identity

Question 15

law of (constant composition / definite proportions)

Answer 15

the observation that the elemental composition of a compound is always the same

Question 16

solutions

Answer 16

homogeneous mixtures. can be solids, liquids or gases

Question 17

physical properties

Answer 17

can be observed without changing the identity and composition of the substance

Question 18

chemical properties

Answer 18

describe the way a substance may change or react from other substances