You can slow down the rate of a reaction by .

a. increasing concentration
b. increasing temperature
c. decreasing particle size
d. adding an inhibitor

Which of the following is NOT an example of an exothermic reaction?
a. the splitting of water into hydrogen and oxygen
b. fireworks exploding
c. fish that emit light
d. propane and oxygen changing into carbon dioxide and water

In an exothermic reaction, heat is .
a. absorbed
b. conserved
c. released
d. destroyed

d. adding an inhibitor

c. fish that emit light

c. released

Explanation:

An inhibitor is a negative catalyst. It is usually a substance that slows down the rate of chemical reaction.

Chemical inhibitors acts in way that makes reactions drags over time.

Increasing temperature, increasing concentration and decreasing particle size all will increase the rate of chemical reaction. They make reactions proceed more faster.

When a fish emits light, it is not an exothermic reaction.

An exothermic reaction is one in which heat is released to the environment. In such reactions, heat is liberated to the surroundings. At the end of the reaction, the surrounding will have a higher temperature compared to the reaction.

We assign exothermic reactions a negative value because the sum of heat contents of products is less than that of reactants.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current