year10 mock

what are the limitations of the particle model

The particle model assumes that particles are solid spheres with no forces between them

what is a chemical change and an example

new substances form from the reactants, it is irreversible

fireworks

what is a physical change and an example

where no new substances are formed, reversible

freezing water

what is an isotope

an element with the same numbers of protons but different numbers of neutrons

(different relative atomic mass)

what is an ion

an atom or group of atoms that has an electric charge

what is meant by a pure substance

a pure substance consists only of one element

how does filtration work

Filtration is performed by pouring the mixture through filter paper: The insoluble solid is trapped by the filter paper. The liquid runs through the filter paper and is collected below

explain the process of crystalisation

Crystallisation is performed by heating the mixture so that the solvent evaporates. Eventually, crystals of the solute (dissolved solids) will form.

what is a formulation in gcse chemistry

a mixture that has been diagnosed to do something useful

what elements react to make ionic bonding and what is the structure look thing

non-metals and metals

in the square brackets

what elements react to make covalent bonds and describe its sharing structure

two non metals

touching with shared parts of the outer shell

What are the typical sizes of nanoparticles

1nm - 100nm

what do you do in ionic equations

cancel out any common elements within the equations

what is stoichiometry

when the ratios in the equation are written as a:b