Currently, as earth's surface becomes warmer, we believe that the level of carbon dioxide in the atmosphere is

a. increasing

b. decreasing

c. staying the same

What are the similarities of physical and chemical change ?

Stage in which a typical star has completely stopped fusion

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.