Science-Biology

Front 1

Matter

Back 1

Anything that oppucies space and has mass

Front 2

Elements

Back 2

Substances that cannot be broken down into other substances. 92 naturally occuring elements.

Front 3

Trace Elements

Back 3

Elements in which only a small amount is required but they are still very important

Front 4

Compound

Back 4

A substance containing 2 or more elements in a fixed ratio

Front 5

Atoms

Back 5

The smallest unit of matter that still retains the properties of an element

Front 6

Protons

Back 6

Subatomic particle with a + charge. Found in the nucleus of an atom. The number of protons tells you which element the atom belongs.= the atomic number

Front 7

Nuetrons

Back 7

Subatomic particle with no charge. Found in the nucleus of an atom. The number of nuetrons may vary from different atoms of the same element which are called isotopes

Front 8

Electrons

Back 8

Subatomic particle with a - charge. Found in the orbitals

Front 9

Mass Number

Back 9

The mass of the protons and nuetrons together

Front 10

Isotopes

Back 10

Atoms of the same element with a different number of nuetrons

Front 11

Radioactive Isotopes

Back 11

Isotopes where the nuleus breaks down giving off energy and particles. They are used to track elements through living systems

Front 12

Chemical Bonding

Back 12

An attraction between atoms resulting in the sharing of outer shell electrons or the transfer of electonsbetween atoms. (Atoms bond to complete their outer shell)

Front 13

Ionic Bonds

Back 13

Bonding involving the transfer of electons between atoms

Front 14

Ions

Back 14

Negitively or Positively charged atoms or particles

Front 15

Covalent Bonds

Back 15

Bonding involving the sharing of electrons

Front 16

Molecules

Back 16

Atoms covalently bonded together

Front 17

Chemical Reations

Back 17

A process leading to chemical changes in matter. It involves the making and breaking of chemical bonds.

Front 18

Reatants

Back 18

A starting material in a chemical reaction

Front 19

Polar Molecules

Back 19

A molecule that has an oppoisite changes on opposite ends

Front 20

Cohesion`

Back 20

Water molecules attached by weak hydrogen bonds to eachother

Front 21

Heat

Back 21

the amount of energy associated with the movement of molecules in matter

Front 22

Temperatures

Back 22

A measure of speed of the molecules in matter

Front 23

Evaporative Cooling

Back 23

Helps you cool off in the summer time. Thefastest moving molecules of water break away and leave the slowest coolest molecules behind.

Front 24

Why does it float?

Back 24

When water freezes, it organizes into a crystal shape that holds water molecules at "arm length" to make it less dense that liquid water.

Front 25

Solution

Back 25

A homogenous mixture of two substances. Usually a solid

Front 26

Solvent

Back 26

Part of a colution that is in the greatest quantity. Usually a liquid

Front 27

Solute

Back 27

The substances in the smaller quantity. Ofter a solid

Front 28

Acid

Back 28

A substance that when added to water increases ion concentration

Front 29

Base

Back 29

A substance that when added to water increases the OH concentration.

Front 30

pH scale

Back 30

measures the extent tp which a compoun is acidic or base

Front 31

Buffers

Back 31

substances in liquids that resist changes in ph.