Chemistry: unit 2

Question 1

Chemistry

Answer 1

A branch of 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; the use of the processes to form new substances.

Question 2

Matter

Answer 2

Anything that has mass and takes up space.

Question 3

Extensive Properties

Answer 3

Such as mass and volume.

Question 4

Intensive Properties

Answer 4

Such as color and density.

Question 5

Mass

Answer 5

The amount of matter in an object.

Question 6

Volume

Answer 6

The amount of space that a substance or object occupies, or that is enclosed within a container.

Question 7

Physical Property

Answer 7

Any property that is measurable, whose value describes a state of a physical system, often referred to as observables.

Question 8

Physical Change

Answer 8

A usually reversible change in the physical properties 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 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

A distinct and homogeneous form of matter ( particularly solid, liquid or gas) separated by its surface from other forms.

Question 12

Solid

Answer 12

A firm and stable in shape, not liquid or fluid.

Question 13

Liquid

Answer 13

A substance that flows freely but is of constant volume, having a consistency like that of water or oil.

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

To freeze, below 32 degrees fahrenheit.

Question 16

Melting

Answer 16

Make or become liquefied by heat.

Question 17

Vaporization

Answer 17

The state or act of being vaporized

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

The process where a gas changes phase and turns directly into a solid without passing through the liquid phase.

Question 21

Substance (pure substance)

Answer 21

A particular kind of matter with uniform properties.

Question 22

Element

Answer 22

A substance that can’t 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

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

Question 25

Mixture

Answer 25

A substance made by mixing other substances together.

Question 26

Homogeneous Mixture

Answer 26

Simply any mixture that is uniform in composition throughout.

Question 27

Solution

Answer 27

A liquid mixture in which the minor component is uniformly distributed within the major component.

Question 28

Heterogeneous Mixture

Answer 28

A mixture that composes of components that aren't uniform or they have localized regions that all have different properties.

Question 29

Filtration

Answer 29

The action or process of filtering something.

Question 30

Distillation

Answer 30

The action of purifying a liquid by a process of heating and cooling.

Question 31

Chemical Reaction

Answer 31

A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

Question 32

Reactant

Answer 32

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

Question 33

Product

Answer 33

The species formed from chemical reactions, reactants are transformed into products.

Question 34

Precipitate

Answer 34

Cause 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.