Match these items.

1. an atom that has gained or lost electrons

2. produces OH - ions when added to water

3. produces H + ions when added to water

Acid

Base

Ion

1. An atom that has gained or lost electrons - Ion

2. Produces OH - ions when added to water - base

3. Produces H + ions when added to water - acid

Explanation:

An ion is an electrically charged particle which is formed by the loss or gain of electrons. An atom generally looses or gains an electron in order to complete its outermost shell (valence shell) and become stable. When this happens an Ion is formed. Bases are the substances which release hydroxide ions (OH-) whenever they are put in an aqueous solution. This is because they contain hydroxide in their chemical formula. E. g Sodium hydroxide (NaOH) is a base. Acids are the substances which are capable of producing hydrogen ions whenever they are kept in an aqueous solution. This is because they have hydrogen present in their chemical formula. e. g Hydrochloric acid (HCl) is an acid.

1. An atom that has gained or lost electrons - Ion

2. Produces OH - ions when added to water - base

3. Produces H + ions when added to water - acid