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

answer7,570,82356 cubic centimeters;

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.