Quiz 4.6 - Collision Theory

Which of the following changes increases both the frequency and effectiveness of collisions in a chemical reaction?

Increasing pressure of a gas

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Increasing surface area of a solid

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Increasing temperature

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Adding an inert gas at constant volume

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According to Collision Theory, which condition is NOT necessary for a successful reaction?

Reacting species must collide

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Collisions must have sufficient energy

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Reactants must be in gaseous form

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Proper orientation during collision is needed

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The rate of reaction increases significantly with temperature because:

Molecules become heavier

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Activation energy increases

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A higher proportion of molecules have energy ≥ Ea

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Collisions occur at lower energy levels

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Which best explains why a catalyst increases the rate of a reaction?

It increases reactant concentration

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It decreases the energy of collisions

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It provides an alternative pathway with a lower activation energy

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It increases the molecular weight of the reactants

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Which reaction would show the greatest increase in rate when the pressure is increased?

A(g) → B(g)

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A(g) + B(g) → C(g)

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A(g) → B(s)

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A(s) + B(l) → C(l)

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Which of the following statements about ineffective collisions is TRUE?

They always occur when energy exceeds activation energy

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They may occur due to incorrect molecular orientation

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They result in side reactions

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They always form intermediates

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At constant temperature, which of the following does NOT affect the number of effective collisions?

Activation energy

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Catalyst presence

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Orientation of molecules

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Volume of products formed

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What is the primary reason powdered solids react faster than large chunks of the same material?

Powder has higher molar mass

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Powder reacts only on the surface

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Powder has a higher surface area, increasing collision frequency

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Chunks are chemically inert

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Which of the following changes would decrease the rate of a chemical reaction?

Increasing temperature

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Increasing surface area

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Removing catalyst

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Increasing concentration

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In Collision Theory, which factor determines whether a collision leads to a reaction?

Speed of the reaction vessel

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Activation energy and correct orientation

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Volume of reactants

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Pressure alone

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Quiz 4.6 – Collision Theory

Quiz 4.6 – Collision Theory

Stephen April 11, 2025

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