Question

select all the correct answers. some chemical reactions absorb energy rather than release it. which of these phenomena are caused by chemical reactions that absorb energy? if youre not sure, make a guess.
plants use sunlight and atmospheric gases to make food.
a person activates a cold pack by hitting it against a surface.
a rechargeable battery is plugged in to charge.
heat is used to separate a compound into its elements.

Explanation:

Step1: Define endothermic reactions

Reactions absorbing energy.

Step2: Analyze each option

• Photosynthesis: Absorbs light energy (endothermic).
• Cold pack: Endothermic reaction absorbs heat.
• Battery charging: Requires energy input (endothermic).
• Decomposition: Heat input (endothermic).

Answer:

Plants use sunlight and atmospheric gases to make food., A person activates a cold pack by hitting it against a surface., A rechargeable battery is plugged in to charge., Heat is used to separate a compound into its elements.