How do catalysts affect a chemical reaction?(1 point)
Responses
lose activation energy
lose activation energy
lower activation energy
lower activation energy
provide activation energy
provide activation energy
increase activation energy
9 answers
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.
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 proceeds slowly.
The reaction proceeds slowly.
The reaction yields something.
The reaction yields something.
The reaction proceeds quickly.
The reaction proceeds quickly.
The reaction is reversible.
Responses
The reaction proceeds slowly.
The reaction proceeds slowly.
The reaction yields something.
The reaction yields something.
The reaction proceeds quickly.
The reaction proceeds quickly.
The reaction is reversible.
The reaction yields something.
Which kind of reaction is photosynthesis?(1 point)
Responses
light-independent
light-independent
temperature-independent
temperature-independent
exothermic
exothermic
endothermic
Responses
light-independent
light-independent
temperature-independent
temperature-independent
exothermic
exothermic
endothermic
endothermic
Photosynthesis requires which kind of energy?(1 point)
Responses
mechanical energy
mechanical energy
light energy
light energy
heat energy
heat energy
thermal energy
Responses
mechanical energy
mechanical energy
light energy
light energy
heat energy
heat energy
thermal energy
light energy
10 answers