Chemistry: Unit 2

Question 1

Chemistry

Answer 1

the branch of science that identifies the substances of which matter is composed

Question 2

Matter

Answer 2

physical substance that takes up space and has mass

Question 3

Extensive Properties

Answer 3

mass and volume of a substance

Question 4

Intensive Properties

Answer 4

a bulky property ; hardness

example : color , boiling point , pressure , molecular , weight , and density

Question 5

Mass

Answer 5

typically large body of matter with no definite shape

Question 6

Volume

Answer 6

the amount of space that an object occupies

Question 7

Physical Property

Answer 7

changing the chemical nature of matter

Examples : color , freezing point , smell , boiling point , melting point ,

Question 8

Physical Change

Answer 8

a change without altering the chemical composition of a substance

Question 9

Chemical Property

Answer 9

a property of a substance that is observed during a reaction in which the chemical composition in the substance is changed

Question 10

Chemical Change

Answer 10

a chemical reaction involving the rearrangement of the atoms if one or more substances change in their chemical properties or composition resulting

Question 11

Phase (phase of matter)

Answer 11

state in which matter can exist as a solid , liquid or gas

Question 12

Solid

Answer 12

a state of matter characterized by particles arranged such that their shape and volume are relatively stable

Question 13

Liquid

Answer 13

a state of matter that the substance is free to flow . the liquid has a definite volume an does not have a definite shape

Question 14

Gas

Answer 14

a state of matter composed of molecules in constant random motion and has no fixed shape or form

Question 15

Freezing

Answer 15

the process of which a substance changes from a liquid to a solid

Question 16

Melting

Answer 16

the physical process that turns a substance from a solid to a liquid when the internal energy of the solid increases by heat or pressure

Question 17

Vaporization

Answer 17

of an element or compound transitioning from liquid to vapor
two types: evaporation and boiling

Question 18

Condensation

Answer 18

changes a gas to a liquid

Question 19

Sublimation

Answer 19

state of matter where a substance changes from a solid to a gas without passing the liquid phase

Question 20

Deposition

Answer 20

the direct solidification of a vapor by cooling (opposite of sublimation) (gas to a solid)

Question 21

Substance (pure substance)

Answer 21

substances that are only made of one type of atom or one type of molecule

Question 22

Element

Answer 22

a substance which it’s atoms have the same number of protons ; they have the same atomic number

Question 23

Chemical Symbol

Answer 23

the periodic table

Question 24

Compound

Answer 24

substance formed when two or more chemical elements chemically bonded together (water to an oxygen)

Question 25

Mixture

Answer 25

any substance that is a combination or two or more pure substances in which each pure substance retains its own chemical properties

Question 26

Homogeneous Mixture

Answer 26

substances and mixtures which are in a single phase | example : air

Question 27

Solution

Answer 27

homogeneous mixture composed of two or more pure substances

Question 28

Heterogenous Mixture

Answer 28

the initial substances cannot be detected after they have been mixed

Question 29

Filtration

Answer 29

any of the various mechanical physical or biological operations that separate solids from liquids by adding a medium that the fluid can pass through

Question 30

Distillation

Answer 30

used to purify water or other substances

Question 31

Chemical Reaction

Answer 31

a process in which one or more substances are converted to to one or more different substances

Question 32

Reactant

Answer 32

a substance that takes part in change during a reaction

Question 33

Product

Answer 33

species formed from chemical reactions ; the reactants are transformed into products after passing through a high energy transition state

Question 34

Precipitate

Answer 34

cause ( a substance ) to be deposited in solid form from a solution

Question 35

Law of Conservation of Mass

Answer 35

states that mass in an isolated system is neither created or destroyed by chemical reactions or physical transformations