Answer:
a. because it is an element
Explanation:
its pure because it only has one type of atom, making it an element
Answer:
The reason for covering the container is to make sure that the atmosphere in the beaker is saturated with solvent vapour. Saturating the atmosphere in the beaker with vapour stops the solvent from evaporating as it rises up the paper.
Answer:
an alkali
Explanation:
an alkali is a base that is slightly soluble in water
