How do catalysts affect a chemical reaction?(1 point) Response
increase activation energy
increase activation energy
lower activation energy
lower activation energy
provide activation energy
provide activation energy
lose activation energy
lose activation energy
Catalysts lower activation energy.
What happens during rusting of an iron nail?(1 point)
Responses
Iron and sulfur combine to form iron sulfide.
Iron and sulfur combine to form iron sulfide.
Sulfur and oxygen combine to form a sulfur dioxide coating.
Sulfur and oxygen combine to form a sulfur dioxide coating.
Iron and oxygen combine to form iron oxide.
Iron and oxygen combine to form iron oxide.
Sulfur, iron, and oxygen combine to form iron sulfoxide.
Iron and oxygen combine to form iron oxide.
What does the forward arrow in a chemical equation mean?(1 point)
Responses
The reaction is reversible.
The reaction is reversible.
The reaction yields something.
The reaction yields something.
The reaction proceeds quickly.
The reaction proceeds quickly.
The reaction proceeds slowly.
The reaction yields something.
Which kind of reaction is photosynthesis?(1 point)
Responses
endothermic
endothermic
exothermic
exothermic
temperature-independent
temperature-independent
light-independent
Photosynthesis is endothermic.
Photosynthesis requires which kind of energy?(1 point)
Responses
heat energy
heat energy
light energy
light energy
mechanical energy
mechanical energy
thermal energy
Photosynthesis requires light energy.
Catalysts affect a chemical reaction by lowering the activation energy required for the reaction to occur. Activation energy is the minimum amount of energy needed for a reaction to start. When a catalyst is present, it provides an alternative pathway for the reaction, which has a lower activation energy. This lowered activation energy allows the reactant molecules to more easily overcome the energy barrier and proceed with the reaction.
To answer the question, "How do catalysts affect a chemical reaction?", the correct answer is "lower activation energy". The other options, such as "increase activation energy", "provide activation energy", and "lose activation energy", are incorrect as they do not accurately describe the role of catalysts in a chemical reaction.