H Chemistry: Unit 2

Question 1

pure substance

Answer 1

matter with a uniform and unchanging chemical composition

Question 2

physical property

Answer 2

characteristic that can be observed without changing the chemical composition

Question 3

intensive property

Answer 3

physical property that does not depend on the amount present

Question 4

extensive property

Answer 4

physical property that depends on the amount present

Question 5

malleable

Answer 5

able to be flattened into sheets

Question 6

ductile

Answer 6

able to be drawn into a wire

Question 7

chemical property

Answer 7

characteristic that can only be observed if the substance changes chemical composition

Question 8

solid

Answer 8

definite shape, definite volume

Question 9

liquid

Answer 9

takes on shape of its container, definite volume

Question 10

gas

Answer 10

takes on shape & volume of its container

Question 11

gas v. vapor

Answer 11

gas is a substance that is gaseous at room temperature, vapor is a substance in the gaseous state but a solid or liquid at room temperature

Question 12

physical change

Answer 12

change in matter that does not change the chemical composition

Question 13

chemical change

Answer 13

change in matter that forms a new substance with different physical and chemical properties(chemical reaction)

Question 14

chemical equation

Answer 14

mathematical expression of a chemical reaction

Question 15

Law of Conservation of Mass

Answer 15

matter cannot be created nor destroyed but must be conserved throughout chemical reactions

Question 16

the mass of the reactants must

Answer 16

equal the mass of the products

Question 17

mixture

Answer 17

combination of two or more pure substances that are physically combined

Question 18

heterogeneous mixture

Answer 18

mixture that is not uniform throughout

Question 19

homogeneous mixture

Answer 19

mixture that is uniform throughout(solution)

Question 20

separating mixtures

Answer 20

because mixtures are physically combined, they cannot be physically separated based on their unique physical and chemical properties

Question 21

distillation

Answer 21

separate a mixture through different boiling points

Question 22

chromatography

Answer 22

separates liquids through molecular size

Question 23

filtration

Answer 23

separates liquids through pore size

Question 24

element

Answer 24

pure substance made of one type of atom that cannot be broken down by ordinary physical or chemical means

Question 25

Dmitri Mendelev

Answer 25

organized elements by mass

Question 26

row

Answer 26

period

Question 27

column

Answer 27

group

Question 28

compound

Answer 28

pure substance made of 2 or more atoms that can be broken down by chemical means

Question 29

compounds have

Answer 29

different physical and chemical properties compared to the elements they are made from

Question 30

Law of Definite Proportions

Answer 30

a compound contains the same proportions of elements no matter the amount or location by mass

Question 31

Law of Multiple Proportions

Answer 31

if two compounds have the same elements but different properties, then the ratio of elements to each other differ

Question 32

percent mass

Answer 32

ratio of the mass of an element to the mass of a compound expressed as a percentage