Rates of Reaction

Which of these would have no effect on the rate of a chemical reaction.

• The person doing the experiment

• Temperature of reactants

• Surface area of reactants

• Adding a catalyst

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A temperature increase causes the particles ......

• to slow down

• move faster

• collide higher

• in the right order

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How does a catalyst work in speeding up a reaction?

• By lowering the activation energy or reaction

• by giving them more energy

• by making them more available

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Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it lowers the activation energy

• it increases the energy of particle collisions

• it increases the frequency of particle collisions

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What is the rate of reaction?

• How fast a reaction is 
• How big a reaction is
• How loud a reaction is
• How much gas a reaction produces

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Grinding a seltzer tablet into powder increases the rate of reaction due to increased

• concentration
• surface area
• temperature
• reactants

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Which factors increase the rate of a reaction.

• increasing temperature
• increasing concentration
• increasing surface area
• all of these

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How could we make this reaction happen more quickly?

• Decrease the concentration of the acid

• crush the chalk to increase the surface area

• Put the test tube in an ice bath

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The major theory of reaction rate is called

• Collision theory

• Crash theory

• Newton's laws

• Thermodynamics

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Which of the following will lower the rate

of reaction?

• adding an enzyme to the reaction

• decreasing the temperature from 40°C to

  10°C

• breaking a chunk of calcium up into

  smaller pieces

• increasing the amount of solute

  dissolved in a solution

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