Key Definitions

Question 1

A Compound

Answer 1

contains the atoms of two or more elements chemically joined together

Question 2

An Element

Answer 2

A substance made up of only one type of atom

Question 3

Impure

Answer 3

A substance that is not pure

Question 4

Melting point

Answer 4

A specific temperature at which a solid turns into a liquid.

Question 5

Mixture

Answer 5

Two or more substances jumbled together physically

Question 6

Physical Property.

Answer 6

A description of how a material behaves and responds to forces and energy. E.g hardness is a physical property.

Question 7

Pure

Answer 7

A single substance that does not have anything else mixed with it.

Question 8

Crystallization

Answer 8

Separating the solute from a solution by evaporating the solvent.

Question 9

Filtrate

Answer 9

Solution passing through a filter

Question 10

Filtration

Answer 10

Using a filter to separate insoluble substances from a liquid

Question 11

hazard

Answer 11

Something that could cause harm

Question 12

insoluble

Answer 12

Describes a substance that can not be dissolved in certain liquid

Question 13

Residue

Answer 13

Material remaining in the filter after mixture has passed threw.

Question 14

risk

Answer 14

The chance of a hazard causing harm.

Question 15

Saturated solution

Answer 15

Contains the maximum amount of solute that can dissolve in that amount of solvent at that temperature,

Question 16

solvent

Answer 16

The liquid in which a solute dissolves to make a solution.

Question 17

chromatography

Answer 17

A technique used for separating the compounds of a mixture,

Question 18

Paper Chromatography

Answer 18

Spotting drops of the sample onto paper, and then allowing the solvent to move up the paper. Different components in the samples travel up the paper in the solvent at different rates.

Question 19

Stationary phase.

Answer 19

The surface through which the solvent and dissolved substances move up in chromatography.

Question 20

Mobile phase

Answer 20

The solvent that moves along the paper carrying the dissolved substances with it.

Question 21

chromatogram

Answer 21

The piece of paper showing the results of carrying out chromatography on substances.

Question 22

Rf Value

Answer 22

Distance of compound [the spot] divided by the distance moved by solvent.