Which of the following happens during a lunar eclipse?

select one:
a. earth casts a shadow on the moon.
b. the moon casts a shadow on earth.
c. earth stops revolving in its orbit.
d. earth starts revolving around the moon.

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next