When the net number of molecules of each reactant and product in ...

[chads108]

When the net number of molecules of each reactant and
  product in a chemical reaction remains the same,
  we say that the reaction is
   a) endothermic.
   b) In equilibrium.
   c) a combustion reaction.
   d) catalytic.

Question 2

What does a double arrow mean when it is used
  between the reactants and the products in a
  chemical equation?
   a) twice as much product is present as reactant
   b) the reaction is a forward reaction only
   c) the reaction is reversible
   d) the reaction requires a high activation energy

[scottmt]

Answer to Question 1

b

Answer to Question 2

c