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1

What is an atom?

An atom is the smallest unit of ordinary matter that has properties of a chemical element

2

Ion

A charged particle formed from the loss or gain of one or more electrons

3

Polyatomic ion

An ion that is composed of more than one atom

4

Molecule

A neutral particle composed of two or more atoms joined together by covalent bonds

5

Element

An element is a substance that is made entirely of one type of atom.

6

Diatomic Molecules

Diatomic Molecules are molecules composed of only two atoms, either the same or different chemical elements

7

Ionic bonds

Ionic bonds are charged atoms that are attracted to each other

8

Binary Acid

An acid composed of hydrogen and non-metal

9

Compound

Compound is a molecule made up of atoms from different elements

10

Pure Substance

A material that is composed of only one type of particle

11

Solution

In a chemical, solution is a homogeneous mixture composed of only one phase. In such a mixture a solute is a substance dissolved in another substance known a solvent

12

Heterogeneous Mixture

when two or more objects are seen by the human eye in a mixture

13

Physical Change

Physical changes are changes affecting the form of the chemical substance but not the chemical composition. Physical changes are used to separate mixtures into their component compounds, but usually cannot be separated into chemical elements or simpler compounds

14

Chemical Reaction

A process in which new substances with new properties are formed

15

Covalent Bonds

Covalent bonds involve the sharing of a pair valence electrons by two atoms. Once they share the electrons they become stable.

16

Oxyacid

An acid composed of hydrogen, oxygen and another element

17

Physical Property

A physical property is any property that is measureable whose value describes a state of a physical system

18

Chemical Property

A chemical property is any of a materials properties that become evident during a chemical reaction

19

Catalyst

A substance that increases the rate of reaction and is regenerated at the end of a reaction

20

Concentration

The amount of a particular substance in a specific amount of another substance, also the amount of dissolved substance contained per unit of volume of solvent

21

Rate of Reaction

The rate of reaction for a given chemical reaction is the measure of change in concentration of the reactants or the change if concentration of the product in unit of time

22

Electromagnetic Spectrum

The entire range of electromagnetic waves in order of wavelength and/or frequency

23

Wavelength

The distance from one crest (or trough) of a wave to the next crest (or trough)

24

Frequency

number of crests (or troughs) that pass a given point in one second

25

Incident Ray

A ray of light that travels from a light source toward a surface

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Reflected Ray

A ray that begins at the point where the incident ray and the normal meet

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Normal`

A line constructed to be perpendicular to a surface where the ray of light meets the surface

28

Angle of Incidence

The angle between the incident ray and the normal in a ray diagram

29

Angle of Reflection

The angle between the reflected ray and the normal in a ray diagram

30

Reflection

The change in direction of a light ray when it bounces off a surface