False
no
These are not chemical reactions but thermonuclear reactions.
No, chemical reactions can be endothermic or exothermic.
Heat energy is necessary for some chemical reactions to occur. Some chemical reactions are endothermic meaning they require or absorb energy for a chemical reaction to occur. Other chemical reaction are exothermic meaning they release energy when the chemical reaction takes place..
A catalyst
A catalyst helps chemical reactions occur.
Chemical reactions that release energy often occur spontaneously. Chemical reactions that absorb energy will not occur without energy.
These are not chemical reactions but thermonuclear reactions.
light energy into chemical energy
No, chemical reactions can be endothermic or exothermic.
endothermic: or energy absorbing reactions
These are called exothermic reactions.
Chemical energy to mechanical energy.
Chemical>light>Heat
false
light energy is changed into chemical energy.
Chemical reactions that occur spontaneously usually give off energy, usually heat.
Endothermic reactions absorb heat from the environment.