Which statement is true regarding reaction rates?
A.
Temperature does not affect the reaction rate.
B.
Increasing temperature or adding a catalyst will decrease the reaction rate.
C.
Increasing temperature or adding a catalyst will increase the reaction rate.
D.
Decreasing temperature and adding a catalyst will increase the reaction rate.
E.
A catalyst does not affect the reaction rate.

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o