Question

1. drag and drop the terms with the statements.

this decreases the need for energy in a reaction and increases the reaction rate.
if the amount of reactant is increased, then the reaction rate will be faster.
this applies to exposing more matter in a solid so that a reaction goes faster.
this applies to increasing contact in a liquid so that a reaction goes faster.
choices
surface area
stir
catalyst
concentration

Explanation:

1. A catalyst lowers the activation energy (energy needed) for a reaction, thus increasing the reaction rate. So the first statement matches "catalyst".
2. Concentration refers to the amount of reactant in a given volume. Increasing reactant amount (concentration) speeds up reaction rate. So the second statement matches "concentration".
3. Surface area, when increased for a solid (like breaking into smaller pieces), exposes more matter for reaction, speeding it up. So the third statement matches "surface area".
4. Stirring a liquid increases the contact between reactants in the liquid, making the reaction faster. So the fourth statement matches "stir".

Answer:

1. catalyst - This decreases the need for energy in a reaction and increases the reaction rate.
2. concentration - If the amount of reactant is increased, then the reaction rate will be faster.
3. surface area - This applies to exposing more matter in a solid so that a reaction goes faster.
4. stir - This applies to increasing contact in a liquid so that a reaction goes faster.