Chemistry: Unit 2

Question 1

Chemistry

Answer 1

identification of substances of which matter is composed; investigation of their properties and the ways which they interact, combine and change

Question 2

Matter

Answer 2

physical and chemical structure: matter is made up of atoms

Question 3

Extensive Properties

Answer 3

such as mass and volume; depend on the amount of matter being measured

Question 4

Intensive properties

Answer 4

such as density and color; do not depend on amount of substance present

Question 5

Mass

Answer 5

measure of the amount of matter in an object

Question 6

Volume

Answer 6

space occupied by a liquid, solid or gas

Question 7

Physical property

Answer 7

any property that is measurable

Question 8

Physical change

Answer 8

changes affecting the form of a chemical substance but not it’s chemical composition

Question 9

Chemical property

Answer 9

a property or characteristic of a substance that is observed during a reaction where the chemical composition is changed

Question 10

Chemical change

Answer 10

chemical reaction involving the rearrangement of the atoms, resulting in the formation of at least one new substance. EX: formation of rust on iron

Question 11

Phase (phase of matter)

Answer 11

the states in which matter can exist. When temperature changes, matter can undergo a phase change

Question 12

Solid

Answer 12

firm and stable in shape

Question 13

Liquid

Answer 13

a substance that flows freely and has constant volume

Question 14

Gas

Answer 14

airlike fluid substance which expands freely to fill any space available

Question 15

Freezing

Answer 15

where a liquid turns into a solid below the temperature of 32 degrees F

Question 16

Melting

Answer 16

where a solid turns to liquid. typically by heat or pressure

Question 17

Vaporization

Answer 17

a phase transition from the liquid phase to vapor

Question 18

Condensation

Answer 18

conversion of a vapor or gas to a liquid

Question 19

Sublimation

Answer 19

when anything solid turns into a gas without first becoming liquid. Ex: surface layer of snow or ice turns into fog or steam without melting

Question 20

Deposition

Answer 20

solidification of a vapor by cooling

Question 21

Substance (pure substance)

Answer 21

substances that are made of only one type of atom

Question 22

Element

Answer 22

a substance that cannot be broken down into simpler substances

Question 23

Chemical symbol

Answer 23

an abbreviation or short representation of a chemical element

Question 24

Compound

Answer 24

a substance formed when two or more chemical elements are chemically bonded together

Question 25

Mixture

Answer 25

a combination of two or more pure substances in which each pure substance retains it’s individual chemical properties

Question 26

Homogeneous mixture

Answer 26

a mixture that is uniform throughout

Question 27

Solution

Answer 27

a homogeneous mixture composed of two or more substances

Question 28

Heterogeneous mixture

Answer 28

a mixture of physically distinct substances with different properties

Question 29

Filtration

Answer 29

physical or biological operations that separate solids from fluids

Question 30

Distillation

Answer 30

the separating of constituents of a liquid by boiling it and then condensing the vapor that results

Question 31

Chemical reaction

Answer 31

a process where the reactants are converted to one or more different substances

Question 32

Reactant

Answer 32

a substance that takes part in and undergoes change during a reaction

Question 33

Product

Answer 33

the species formed from chemical reactions

Question 34

Precipitate

Answer 34

to be deposited in solid form from a solution

Question 35

Law of conservation of mass

Answer 35

states mass is an isolated system is neither created or destroyed by physical transformations. The mass of the products in a chemical reaction must equal the mass of the reactants