Place an X next to each action that would most likely increase the reaction rate.
1.__ Lowering the temperature of the reactants.
2.__ Dissolving two solids in water before mixing them together.
3.__ Diluting an aqueous solution of HCI with water before adding a piece of magnesium.
4.__ Grinding a solid into fine particles.
5.__ Adding an enzyme catalyst.

2.__ Dissolving two solids in water before mixing them together.

4.__ Grinding a solid into fine particles.

5.__ Adding an enzyme catalyst.

Explanation:

The rate of reaction is the measure of the speed of a chemical reaction.

Some factors affects the rate of reactions such as pressure, temperature, concentration, surface area, presence of catalyst.

Reactions in liquid medium are much faster than those between solids because there is a flow of substances. As they come in contact with one another, collision begins to take place. Grinding a solid into fine particles increases the surface area. An increase in surface area increases the rate of reaction. Adding an enzyme catalyst lowers the activation energy and reduces the energy barrier that must be overcome before a reaction takes place.

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