chemistry: unit 2

Question 1

chemistry

Answer 1

study of the composition of matter and the change es that matter undergoes

Question 2

matter

Answer 2

anything that has mass and occupies space

Question 3

extensive properties

Answer 3

a property that depends on the amount of matter in a sample

Question 4

intensive properties

Answer 4

a property that depends on the type of matter in a sample not the amount of matter

Question 5

mass

Answer 5

a measure of the amount of matter that an object contains. the SI base unit of mass is the kilogram

Question 6

volume

Answer 6

a measure of the space occupied by a sample of matter

Question 7

physical property

Answer 7

a quality of condition of a substance that can be observed or measured without changing the substances composition

Question 8

physical change

Answer 8

a change during which some properties of material change but the composition of the materials does not change

Question 9

chemical property

Answer 9

the ability of a substance to undergo a specific chemical change

Question 10

chemical change

Answer 10

a change that produces matter with a different composition than the original matter

Question 11

phase (phase of matter)

Answer 11

any part of a sample with uniform composition and properties

Question 12

solid

Answer 12

a form of matter that has a definite shape and volume

Question 13

liquid

Answer 13

a form of matter that flows has a fixed volume and an indefinite shape

Question 14

gas

Answer 14

a form of matter that takes the shape and volume of its container. no shape or volume

Question 15

freezing

Answer 15

the difference in temperature between the freezing point of a solution and the freezing point of the pure soluent

Question 16

melting

Answer 16

temperature at which a substance changes from solid to a liquid. melting point of water is 0c

Question 17

vaporization

Answer 17

conversion of a liquid to a gas or a vapor

Question 18

sublimation

Answer 18

process in which a solid changes to a gas or vapor without passing through the liquid state

Question 19

substance (pure substance)

Answer 19

matter that has a uniform and definite composition. either a element or compound pure substance

Question 20

element

Answer 20

simplest form of matter that has a unique set of properties. cannot be broken down into simpler substances by chemical means

Question 21

chemical symbol

Answer 21

a one-or two-letter representation of an element

Question 22

compound

Answer 22

substance that contains two or more elements chemically combined in a fixed proportion

Question 23

mixture

Answer 23

a physical blend or two or more substances that are not chemically combined

Question 24

homogenous mixture

Answer 24

mixture that is in uniform in composition.components are evenly distributed and not easily distinguished

Question 25

solution

Answer 25

a homogenous mixture consist of solutes dissolved in a solvent

Question 26

heterogenous mixture

Answer 26

mixture that is not in uniform in composition. components are not evenly distributed throughout the mixture