For each reaction write a balanced chemical equation and thenbelow the chemical formula of each reactant and product write abrief description of the substance (color and physical state).Also, indicate whether the reaction is exothermic, endothermic, orcannot tell.

1. Combination Reaction

Equation:

Exothermic                 Endothermic               Cannot tell

Evidence of Chemical Change:

2. Reversible Decomposition--CombinationReactions

1. Dehydration of Blue Vitrol (Copper(II) SulfatePentahydrate)

Equation:CuSO₄·5H₂O ® CuSO₄ +5H₂O

Exothermic               Endothermic               Cannot tell

Evidence of Chemical Change:

1. Rehydration of Anhydrous Copper(II)Sulfate:

Equation:CuSO₄·5H₂O ® CuSO₄ +5H₂O

Exothermic               Endothermic               Cannot tell

Evidence of Chemical Change:

3. Single Replacement Reaction

Equation: Cu + 2AgNO₃ ® 2Ag+ Cu(NO₃)₂

Exothermic               Endothermic               Cannot tell

Evidence of Chemical Change:

4. Double Displacement Reaction--Milk fromwater:

           

Equation: CaCl₂ +Na₂CO₃ ® CaCO₃ +2NaC1

Exothermic               Endothermic               Cannot tell

Evidence of Chemical Change:

5. Mixed Type Reactions: The Alka-seltzereffect:

Equation:CaCO₃+ 2HCl ® CaCl₂+H₂O + CO₂

Exothermic               Endothermic               Cannot tell

Evidence of Chemical Change:

6. Three Penny Experiment

Please classify each of the following wordequations as a chemical or physicalchange. Give evidence that supports your classification.(Hint, are all silver colored metals silver, or gold colored metalsgold?)

red penny + zinc + zinc chloride solution ® silver penny + zinc+ zinc chloride solution

Exothermic               Endothermic               Cannot tell

Chemical or physical transformation?

Evidence of Chemical Change:

silver penny -®   gold penny

Exothermic               Endothermic               Cannot tell

Chemical or physical transformation?

Evidence of Chemical Change: