What will happen to the relative amounts of hydrogen and helium in the sun over the next few billion years?
a. hydrogen will increase and helium will decrease.
b. hydrogen will decrease and helium will increase.
c. both hydrogen and helium will decrease.
d. both hydrogen and helium will remain the same?

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?