Question

1. match the correct term to complete the sentence.

a(n) __________ increases reaction rates by decreasing the need for energy in a reaction.
choices
surface area
catalyst

1. choose the best answer.

_____ reactions involve the transfer of electrons between reactants.
acid - base
precipitation
redox

Explanation:

Question 7

To solve this, we analyze the definitions: A catalyst speeds up reactions by lowering activation energy (reducing energy need). Surface area affects rate by increasing collision chances, not energy. So the correct term is catalyst.

• Acid - base reactions involve proton transfer.
• Precipitation reactions involve forming insoluble solids.
• Redox (reduction - oxidation) reactions are defined by electron transfer between reactants (one is oxidized, one is reduced). So the correct answer is Redox.

Answer:

catalyst

Question 8