Why does every chemical reaction require a certain amount of activation energy?

A. Energy is released when the reactants begin to react.

B. Energy lost to the environment during the reaction must be replaced.

C. Forming the activated complex requires energy.

D. The products have more potential energy than the activated complex.

E. The reactants have less potential energy than the products.

How does litmus paper indicate an acid?

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?