Atomic Structure And The Periodic Table

Front 1

what is the relative charge of a neutron? what is its relative mass?

Back 1

- a neutron’s relative charge is 0

- relative mass of a neutron is 1

Front 2

explain what is meant by the term isotopes

Back 2

isotopes are different forms of the same element, which have the same number of protons but different numbers of neutrons

Front 3

why do atoms have no charge?

Back 3

atoms have the same number of protons and electrons and neutrons are neutral

Front 4

what is a compound

Back 4

a compound is a substance formed from two or more different elements in fixed proportions, held together by chemical bonds

Front 5

what type of process is needed to separate a compound into its elements why should

Back 5

you need a chemical reaction

Front 6

why should you put a lid on the container during a paper chromatography experiment

Back 6

a lid helps to stop the solvent from evaporating

Front 7

what is a solvent from

Back 7

the point that the solvent in paper chromatography reaches as it moves up the paper

Front 8

what is a mixtureexplain

Back 8

a mixture consists of two or more elements or compounds that are combined, but not chemically bonded together

Front 9

explain why techniques to separate mixtures are described as physical processes when

Back 9

the separation of a mixture is a physical process because it does not involve any chemical reactions and no new substances are made

Front 10

when can filtration be used to separate a mixture

Back 10

filtration can be used when you have a mixture of an insoluble solid and liquid

Front 11

when is crystallisation used to separate a mixture

Back 11

crystallisation is used to separate a soluble solid from a solution

Front 12

explain how filtration works

Back 12

- filtration works by passing the mixture through a filter

- the liquid passes straight through, but the insoluble solid particles are caught by the filter

Front 13

why might crystallisation be used instead of evaporation

Back 13

crystallisation is used if the salt will decompose when heated, or if you want to make big crystals of the salt

Front 14

what equipment would you need to carry out a crystallisation

Back 14

- evaporating dish

- heat source

- beaker

- flask

- funnel

- filter paper

Front 15

in fractional distillation where is the hottest point of the fractioning column

Back 15

the bottom of the fractioning column

Front 16

mixtures of liquids, including those with similar boiling points a

Back 16

mixtures of liquids, including those with similar boiling pointsa

Front 17

explain why simple distillation can’t be used to separate substances with similar boiling point

Back 17

if the boiling points of the compounds are too close together, they will all evaporate and mix together again