Collision Theory in Chemistry

What is collision theory?

• Molecules must collide in the correct orientation with enough energy to bond.

• Molecules need enough energy to collide and react.

• Atoms constantly collide and react.

• The minimum energy needed for atoms to react

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If the reactant particles collide with less than the activation energy, the particles will be rebound, and no reaction will occur.

• True

• False

Why don't all collisions between particles cause a reaction?

• The particles also need to collide with a catalyst

• Not all the particles collide with enough energy

• Not all the particles collide at a high enough temperature

• The particles need to collide with each other twice

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List four factors that affects the rate of a reaction

• Pressure

• Surface area

• Volume

• Concentration

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How does a catalyst work in speeding up a reaction?

• By giving them more energy

• By increasing the activation energy or reaction

• By lowering the activation energy or reaction

• By making them more available

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The rate of a reaction is how _____________ a reaction occurs.

• Quickly

• Easily

• Unusually

• Differently

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A condition that needs to be met for a chemical reaction to occur.

• The substance must be homogeneous.

• The temperature should be kept constant.

• Particles should maintain a certain distance from each other.

• Particles in the substance must collide and have enough energy.

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The factor that will slow down the rate of a chemical reaction.

• Manual stirring of the substance.

• Placing substance in a hot water.

• Placing products in iced water.

• Placing reactants in an ice bath.

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What is the main concept of collision theory in chemistry?

• Molecules must collide with sufficient energy and proper orientation to react.

• Molecules must collide with a catalyst to react.

• Molecules must collide at a high temperature to react.

• Molecules must collide with a high frequency to react.

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Which factor does NOT affect the rate of reaction according to collision theory?

• Concentration of reactants

• Temperature of the system

• Presence of a catalyst

• Color of the reactants

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