Homework Unit 2

Question 1

Chemistry

Answer 1

Science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change

Question 2

Matter

Answer 2

That which occupies space and possesses rest mass, especially as distinct from energy.

Question 3

Extensive Properties

Answer 3

An extensive property is a property of matter that changes as the amount of matter changes.

Question 4

Intensive Properties

Answer 4

An intensive property is a property of matter that does not change as the amount of matter changes.

Question 5

Mass

Answer 5

Mass is a measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

Question 6

Volume

Answer 6

Volume is the quantity of three-dimensional space occupied by a liquid, solid, or gas.

Question 7

Physical Property

Answer 7

Properties that do change the chemical nature of matter.

Question 8

Physical Change

Answer 8

Physical changes can include changing the color, shape, state of matter, or volume of a substance.

Question 9

Chemical Property

Answer 9

A property or 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

A usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition

Question 11

Phase

Answer 11

A physically distinctive form of matter, such as a solid, liquid, gas or plasma.

Question 12

Solid

Answer 12

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

Question 13

Liquid

Answer 13

Liquids consists of atoms or molecules that are connected by intermolecular bonds.

Question 14

Gas

Answer 14

One of four main states of matter, composed of molecules in constant random motion.

Question 15

Freezing

Answer 15

The process through which a substance changes from a liquid to a solid.

Question 16

Melting

Answer 16

A physical process that results in the phase transition of a substance from a solid to a liquid.

Question 17

Vaporization

Answer 17

An element or compound is a phase transition from the liquid phase to vapor.

Question 18

Condensation

Answer 18

The process of a substance in a gas state transforming into a liquid state.

Question 19

Sublimation

Answer 19

Through sublimation, a substance changes from a solid to a gas without ever passing through a liquid phase.

Question 20

Deposition

Answer 20

The direct solidification of a vapor by cooling; the reverse of sublimation.

Question 21

Substance

Answer 21

Substances that are made of only one type of atom or only one type of molecule.

Question 22

Element

Answer 22

A substance that cannot be broken down into simpler substances by chemical means.

Question 23

Chemical symbol

Answer 23

The symbols in the periodic table.

Question 24

Compound

Answer 24

A compound is a substance formed when two or more chemical elements are chemically bonded together.

Question 25

Mixture

Answer 25

A mixture is a combination of two or more pure substances in which each pure substance retains its individual chemical properties.

Question 26

Homogeneous Mixture

Answer 26

Any combination of substances that has uniform composition and properties.

Question 27

Solution

Answer 27

A solution is a homogeneous mixture composed of two or more substances.

Question 28

Heterogeneous Mixture

Answer 28

A mixture is a combination of two or more pure substances in which the original substances retain their chemical properties.

Question 29

Filtration

Answer 29

Filtration is a process used to separate solids from liquids or gases using a filter medium that allows the fluid to pass, but not the solid.

Question 30

Distillation

Answer 30

Distillation is the technique of heating a liquid to create vapor which is collected when cooled separate from the original liquid.

Question 31

Chemical Reaction

Answer 31

A process in which one or more substances, the reactants, are converted to one or more different substances, the products.

Question 32

Reactant

Answer 32

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

Question 33

Product

Answer 33

Products are the species formed from chemical reactions.

Question 34

Precipitate

Answer 34

Cause of a substance to be deposited in solid form from a solution.

Question 35

Law of conservation of Mass

Answer 35

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.