Which of the following is/are true? a
Mixing an acid with base to produce salt and water
is a physical change
b Inflating a volleyball is a chemical change
C Tarnishing of silver is a chemical Change
d All of the above

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