From the list below, determine which properties are for compounds. i. it takes a large amount of energy to separates the elements of a compound. ii. the proportions of the elements in a compound are always fixed. iii. it is easy to separate the elements of a compound. iv. the elements/components of a compound do not retain their individual properties.

All of them are properties of compounds except III.

for I, compounds are chemically combined together, so to separate them, we must use chemical methods like electrolysis or applying heat. These requires large amount of energy.

For II, they're always fixed. For example, in water (H2O), the ratio of hydrogen and oxygen is always 1:8 in mass. If there's some extra added, the substance becomes mixture instead of compounds.

For IV, after you chemically combined elements or compounds together, their properties are completely different. For example, iron can be attracted to magnets, but iron II sulphide does not.

They are all decomposition reactions.