(a) A mixture of milk and water can be separated by filtration.
and by which method

Distillation

Explanation:

Distillation is the process of separating the components of a liquid by using the method of selective boiling and condensation.

Since the components of the liquid have different boiling points, they would evaporate at different temperatures, thus causing the separation to occur.

So, distillation can be used to separate a mixture of milk and water.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

it's c. elements are placed in rows based on how may valencies electrons have.