Two chemical reactions are shown:

ca(oh)2 → cao + h2o
4k + o2 → 2k2o

which statement is true?

a. both are synthesis reactions.

b. both are decomposition reactions.

c. a is a synthesis reaction, and b is a decomposition reaction.

d. a is a decomposition reaction, and b is a synthesis reaction.

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?