(i need this answered quickly! i will give brainliest and extra-extra points to the first person who answers this correctly! )

which is usually associated with a faster reaction rate?
a. adding a catalyst to the reactants
b. blowing a whistle near the reactants
c. removing heat energy from the reactants
d. decreasing the concentration of a solution of the reactants

A - adding a catalyst to the reactants

Explanation:

A catalyst is used to literally mix chemicals and cause the reaction to happen sooner.

A. Adding a catalyst

A catalyst by definition is a substance that increases the rate of a chemical reaction.

Hope this helps!

Explanation:

I did this last year I think.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the increase of protons   hope this