How does a catalyst increase the rate of a reaction?

A) It decreases the enthalpy change of the reaction.
B) It lowers the potential energy of the reactants.
C) It provides a lower activation energy for the reaction.
D) It raises the potential energy of the products.

How does litmus paper indicate an acid?

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together