Which of the following will lower the rate of reaction? (there are 2 answers to select) A. decreasing the temperature from 30 degrees to 20 degrees Celsius.

B. Adding an enzyme to the reaction.

C. breaking a chunk of reactant up into smaller pieces.

D. decreasing the concentration of a reactant.

What are the 4 phases of matter in order of increasing engery content?

What material does not melt at any temperature

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.