chemistry unit.2

Question 1

Chemistry

Answer 1

the branch of science that deals with the identification of the substances of which matter is composed

Question 2

Matter

Answer 2

physical substance in general

Question 3

Extensive Properties

Answer 3

Mass and volume are extensive properties

Question 4

Intensive Properties

Answer 4

a bulk property, meaning that it is a physical property of a system that does not depend on the system size or the amount of material in the system

Question 5

Mass

Answer 5

large body of matter with no definite shape

Question 6

Volume

Answer 6

the amount of space that a substance or object occupies

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

Question 9

Chemical Property

Answer 9

characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed

Question 10

Chemical Change

Answer 10

irreversible chemical reaction involving the rearrangement of the atoms of one or more substances

Question 11

Phase (phase of matter)

Answer 11

The states in which matter can exist: as a solid, liquid, or gas

Question 12

Solid

Answer 12

firm and stable in shape; not liquid or fluid

Question 13

Liquid

Answer 13

a substance that flows freely but is of constant volume

Question 14

Gas

Answer 14

an airlike fluid substance which expands freely to fill any space available, irrespective of its quantity

Question 15

Freezing

Answer 15

When a liquid turns into a solid

Question 16

Melting

Answer 16

make or become liquefied by heat

Question 17

Vaporization

Answer 17

a phase transition from the liquid phase to vapor

Question 18

Condensation

Answer 18

water that collects as droplets on a cold surface when humid air is in contact with it

Question 19

Sublimation

Answer 19

When anything solid turns into a gas without first becoming liquid

Question 20

Deposition

Answer 20

direct solidification of a vapor by cooling

Question 21

Substance (pure substance)

Answer 21

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

Question 22

Element

Answer 22

composed of atoms that have the same atomic number

Question 23

Chemical Symbol

Answer 23

a notation of one or two letters representing 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 its individual chemical properties

Question 26

Homogeneous Mixture

Answer 26

substances and mixtures which are in a single phase (homo means same)

Question 27

Solution

Answer 27

homogeneous mixture composed of two or more substances

Question 28

Heterogeneous Mixture

Answer 28

two or more pure substances in which the original substances retain their chemical properties (hetero means different)

Question 29

Filtration

Answer 29

any of various mechanical, physical or biological operations that separate solids from fluids

Question 30

Distillation

Answer 30

can be used to purify water or other substances, or to remove one component from a complex mixture

Question 31

Chemical reaction

Answer 31

a process in which one or more substances, 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

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 nor destroyed by chemical reactions or physical transformations the mass of the products in a chemical reaction must equal the mass of the reactants.