A substance is reacted with an alkene to form a compound with a single bond between the two formerly double bonded carbon atoms. An example is the decolourisation of bromine.
A substance that will neutralise an acid is called a base. When an acid reacts with a base, a salt and water is formed. If a base is soluble in water, it is called an alkali.
The mass of a body divided by its volume. Something has a high density of it is heavy but only small.
The chemical change that is brought about by passing electricity through a substance. The substance must be ionic and either molten or in aqueous solution.
This is a substance that is composed of only one kind of atom. All the atoms in an element are the same. A chemical reaction cannot break an element into anything simpler.
An atom or group of atoms that has gained or lost one or more elecrons.
A substance that is neither acidic nor alkaline. It has a pH of 7
This is a mixture of indicators which shows the strength of an acid or alkali as well as simply showing which it is. By comparison with a colour chart, a pH number can be selected.
A factor that can be changed in an experiment.
A completely empty space. The collapsing can experiment shows the effect of the pressure of gas particles.
how close a value is to the actual or true value; also see precision
a chemical compound used to change the rate (either to speed up or slow down) of a reaction, but is regenerated at the end of the reaction.
Group 17 on the Periodic Table and are all non-metals
The energy of an object due to its motion.
energy in the form of waves or subatomic particles when there is a change from high energy to low energy states