Question

substance a and substance b are mixed together. to separate the mixture, water is added, and substance a is filtered out. then, the remaining liquid is heated to remove the water, leaving substance b. which statement about substance a and substance b could be correct? (1 point)
substance a is alcohol, and substance b is salt
substance a is salt and substance b is also salt
substance a is rice, and substance b is sugar
substance a is sodium and substance b is chloride, they had reacted together as sodium chloride

Explanation:

When water is added and one substance is filtered out, it means that substance is insoluble in water. Then water is removed from the remaining liquid to get the other substance, which implies the other substance is soluble in water. Rice is insoluble in water and sugar is soluble in water, fitting the separation process described. Alcohol is soluble in water and can't be filtered out this way. If both substances are salt, they would both dissolve in water and not be separated like this. Sodium and chloride react to form sodium - chloride which is a single compound, not a mixture to be separated in this way.

Answer:

Substance A is rice, and substance B is sugar.