How do catalysts affect a chemical reaction?(1 point)
Responses
provide activation energy
increase activation energy
lose activation energy
lower activation energy
lower activation energy
endothermic
light energy
Iron and oxygen combine to form iron oxide.
What happens during rusting of an iron nail?(1 point)
Responses
Sulfur, iron, and oxygen combine to form iron sulfoxide.
Iron and sulfur combine to form iron sulfide.
Iron and oxygen combine to form iron oxide.
Sulfur and oxygen combine to form a sulfur dioxide coating.
What does the forward arrow in a chemical equation mean?(1 point)
Responses
The reaction yields something.
The reaction proceeds quickly.
The reaction is reversible.
The reaction proceeds slowly.
Which kind of reaction is photosynthesis?(1 point)
Responses
light-independent
endothermic
temperature-independent
exothermic
Photosynthesis requires which kind of energy?(1 point)
Responses
thermal energy
mechanical energy
light energy
heat energy
How do you show the group of digits that repeat in a repeating decimal?(1 point)
Responses
by putting a bar over them
by printing them in italics
by underlining them
by putting them in parentheses