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Question 1

what are isotopes

Answer 1

Isotopes are forms of an element that have the same number of protons but different numbers of neutrons.

Question 2

how to find volume of gas from moles

Answer 2

moles x 24 = volume

Question 3

how to find the number of moles from mass

Answer 3

mass/ mr

Question 4

what is crystallisation

Answer 4

used to produce solid crystals from a solution

Question 5

what is chromatography

Answer 5

chromatography is a separation technique used to separate mixtures of soluble substances.

Question 6

what is a compound

Answer 6

A pure substance made from more than one type of element chemically bonded together.

Question 7

what is an atom

Answer 7

Atoms are very small particles made up of a electrons orbiting a nucleus. The nucleus is made out of protons and neutrons. Protons, Neutrons and Electrons are called subatomic particles. ‘Subatomic’ means ‘inside the atom’.

Question 8

what is filtration

Answer 8

the process of separating solids from liquids using filter paper

Question 9

what are ionic compounds

Answer 9

formed by the loss and gain of electrons they are held together by string electrostatic forces of attraction between oppositely charged ions.

these strong ionic bonds allow ‘billions’ of ions to be packed together in a regular repeating arrangement called a lattice structure

Question 10

what is a mixture

Answer 10

A mixture contains two or more substances not chemically combined together. Mixtures can be separated by processes such as filtration, distillation, crystallisation and chromatography.