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Multiple Choice
What must occur before a chemical reaction can begin?
A
Reactants must collide with sufficient energy.
B
Reactants must be in a gaseous state.
C
Reactants must be at room temperature.
D
Products must be formed spontaneously.
Verified step by step guidance
1
Understand that for a chemical reaction to occur, reactants must collide with each other. This is known as the collision theory.
Recognize that not all collisions result in a reaction. The reactants must collide with sufficient energy to overcome the activation energy barrier.
Activation energy is the minimum energy required for a reaction to occur. It is the energy needed to break bonds in the reactants so that new bonds can form in the products.
Consider that the physical state of reactants (solid, liquid, gas) can affect the frequency and energy of collisions, but being in a gaseous state is not a requirement for all reactions.
Note that reactions do not necessarily occur spontaneously at room temperature; they require the right conditions, such as sufficient energy from collisions, to proceed.