What is a heterogeneous mixture

A heterogeneous mixture is simply any mixture that is not uniform in composition - it's a non-uniform mixture of smaller constituent parts.

when all components are visible in the mixture

Explanation:

Basically you are able to see everything that is in there separately

- Water and Oil

- Cold Water and Salt

- Water and Sand

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

the answer for sodium is 0.186

the answer for rubidium is 0.251