Solute crystals are added to a solution until they begin to sink to the bottom of their container. the solution is then heated, and many more solute crystals dissolve. which term best describes the solution immediately after it was heated?
saturated
unsaturated
concentrated
supersaturated

Option (b) is the correct answer.

Explanation:

A solution in which more and more solute can be dissolved until and unless they reach their equilibrium solubility is known as unsaturated solution.

Therefore, when more solute particles are able to dissolve in the solution then the solution is unsaturated.

Hence, we can conclude that unsaturated best describes the solution immediately after it was heated.

58 km per hour : d

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.