Atoms

Question 0

Name two diffusion experiments

Answer 0

Ammonia and hydrogen chloride

Bromine gas and air

Question 1

Describe the purpose of the potassium magnate and water experiment

Answer 1

The potassium slowly spreads out through the water the fill the beaker
This shows the particles diffusing out and displays the random motion of liquid particles

Question 2

Atom

Answer 2

the smallest particle of a chemical element that can exist

Question 3

Molecule

Answer 3

a group of atoms bonded together, representing the smallest fundamental unit

Question 4

Element

Answer 4

each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances

Question 5

Compound

Answer 5

a thing that is composed of two or more different elements that are chemically bonded together

Question 6

Mixture

Answer 6

A compound that has no chemical bond and can be separated through physical methods

Question 7

Describe filtration

Answer 7

Can be used if your product is an insoluble solid

used in purification

Question 8

Describe Crystallisation

Answer 8

Used the separate a soluble solid from a solution

Slowly heat the solution in an evaporating dish, crystals will then start to form

Question 9

Describe Chromatography

Answer 9

Method used to separate out mixtures
Chromatography works because different dyes move up to paper at different rates, some will stick to the paper an others will dissolve
The distance the dyes travels depends on the solvent and the paper used

Question 10

Describe simple Distillation

Answer 10

Used for separating a out a liquid from a solution
The solution is heated, the substance with the lowest boiling point evaporates and is collected
This is only used to separate solutions with very different boiling points

Question 11

Describe Fractional distillation

Answer 11

Used to separate a mixture of liquids
Heat the mixture and the different liquids with different boiling points will evaporate at different temperature
The column used is cooler near the tops the liquid will only get part the way up before condensing and being collected