200
______ metals are soft and can be cut with a knife.
Nitric acid is _________.
To ______ is to make a liquid weaker or thinner by adding more liquid, often water.
We use an _________ to tell us if our solution is an acid or an alkali.
______ paper is used as an indicator in science.
_______ is neither acid nor alkaline.
_______ is an acidic everyday household substance.