Chemistry: Unit 2

Question 1

Chemistry

Answer 1

the science that deals with the composition and properties of substances and various elementary forms of matter.

Question 2

Matter

Answer 2

Matter is defined as anything that has mass and takes up space

Question 3

Extensive Properties

Answer 3

a physical property of a system that does not depend on the system size or the amount of material in the system

Question 4

Intensive Properties

Answer 4

density and color, do not depend on the amount of matter.

Question 5

Mass

Answer 5

A measure of how much matter is in an object.

Question 6

Volume

Answer 6

he volume of an object is a measure of the amount of space occupied by that object

Question 7

Physical Property

Answer 7

hat do change the chemical nature of matter.

Question 8

Physical Change

Answer 8

a change in which no new substances are formed

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 and a change in their chemical properties or composition

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

The molecules in solids are closely bound together, they can only vibrate.

Question 13

Liquid

Answer 13

. A phase of matter in which atoms or molecules can move freely while remaining in contact with one another

Question 14

Gas

Answer 14

a substance (such as oxygen or hydrogen) that is like air and has no fixed shape

Question 15

Freezing

Answer 15

he process when a liquid turns into a solid

Question 16

Melting

Answer 16

to change or to cause (something) to change from a solid to a liquid

Question 17

Vaporization

Answer 17

physics and chemistry, the conversion of a solid or a liquid into a gas.

Question 18

Condensation

Answer 18

the process by which water vapor in the air is changed into liquid water

Question 19

Sublimation

Answer 19

When anything solid turns into a gas without first becoming liquid, that’s sublimation.

Question 20

Deposition

Answer 20

the process by which rocks, sand and sediment are deposited by the forces of erosion

Question 21

Substance (Pure Substance)

Answer 21

The pure substance within chemistry is a very simple concept to grasp

Question 22

Element

Answer 22

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

Question 23

Chemical Symbol

Answer 23

an abbreviation or short representation of a chemical element; the symbols in the periodic table.

Question 24

Compound

Answer 24

The type of bonds holding elements together in a compound can vary: two common types are covalent bonds and ionic bonds.

Question 25

Mixture

Answer 25

a mixture is a material made up of two or more different substances which are mixed but are not combined chemically.

Question 26

Homogeneous Mixture

Answer 26

A solution is a mixture where one of the substances dissolves in the other.

Question 27

Solution

Answer 27

A solution is a homogeneous mixture 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

is any of various mechanical, physical or biological operations that separate solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

Question 30

Distillation

Answer 30

Distillation

Question 31

Chemical Reaction

Answer 31

A process in which atoms of the same or different elements rearrange themselves to form a new substance

Question 32

Reactant

Answer 32

a substance that enters into and is altered in the course of a chemical reaction.

Question 33

Product

Answer 33

Products are the species formed from chemical reactions

Question 34

Precipitate

Answer 34

precipitate is an insoluble solid that emerges from a liquid solution. The emergence of the insoluble solid from solution is called precipitation.

Question 35

Law of Conservation of Mass

Answer 35

states that mass can neither be created nor destroyed in a chemical reaction.