Chemistry

Copper + silver

________ → no reaction (unreactive) layer is insoluble in water, is formed and coated around the metal.

Alkalis

________ have a bitter taste and feels soapy.

Ammonium

________ (NH4) salts contains nitrogen.

electricity

Acids can conduct ________.

Alkalis

________ reacts with acids to form salt and water ONLY.

Alkalis

________ are corrosive when concentrated.

insoluble particles

Precipitate= ________ produced in liquid by chemical reaction.

pH of soil unsuitable for plant growth due to

too much fertiliser added to the soil or environmental pollution such as acidic rain

pH range -indicator changes colour

5-8