Quiz 4.5 - Factors Affecting Rate of Reaction

Which of the following will increase the rate of a chemical reaction?

Decreasing temperature

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Using powdered reactants

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Using large chunks of reactants

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Lowering the concentration of reactants

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What effect does increasing the temperature have on the rate of a reaction?

Decreases energy of particles

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Decreases frequency of collisions

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Increases number of successful collisions

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Has no effect

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In which of the following scenarios would the rate of reaction be slowest?

High temperature, high concentration

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Low temperature, high concentration

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Low temperature, low concentration

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High temperature, low concentration

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Why does a catalyst increase the rate of a chemical reaction?

It increases concentration

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It increases pressure

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It lowers activation energy

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It increases product stability

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How does increasing the pressure affect the rate of reaction of gases?

It decreases the number of collisions

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It increases the frequency of collisions

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It decreases the temperature

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It reduces the volume of container only

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Which factor is most likely to increase the reaction rate between hydrochloric acid and magnesium ribbon?

Using cold acid

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Cutting the magnesium into small pieces

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Diluting the acid

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Using larger pieces of magnesium

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A powdered reactant reacts faster than a solid block of the same substance because:

It has more mass

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It is more concentrated

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It has a larger surface area

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It dissolves better

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Which of these does not change the rate of a chemical reaction?

Surface area

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Mass number of the elements

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Temperature

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Concentration

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In a reaction between sodium thiosulfate and hydrochloric acid, increasing the concentration of hydrochloric acid will:

Slow down the reaction

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Make no difference

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Increase the rate of reaction

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Stop the reaction completely

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A catalyst is best described as a substance that:

Increases the temperature of the reaction

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Increases the energy of reactants

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Changes the product of a reaction

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Speeds up the reaction without being used up

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Quiz 4.5 – Factors Affecting Rate of Reaction

Quiz 4.5 – Factors Affecting Rate of Reaction

Stephen March 28, 2025

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