Chemical Kinetics

For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is

• Two

• One

• Half

• Zero

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NGSS.HS-PS1-5

In pseudo unimolecular reactions

• both the reactants are present in low concentration

• both the reactants are present in same concentration

• one of the reactant is present in excess

• one of the reactant is non-reactive

Limestone chunks are reaction with hydrochloric acid solution at constant temperature with average speed. If we crash the chunks of limestone into powder how would speed of reaction change?

• Reaction speeds up

• Reaction does not change

• Reaction slows down

• Reaction stops

Reaction rate means...

• amount of product formed

• speed of reaction

• concentration of reacting particles

• combining reactants with products

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NGSS.HS-PS1-5

Decreasing the particle size increases the reaction rate because

• It makes particles move faster

• It increases the likelihood of collisions with the correct geometry

• It decreases the surface area available to react

• It increases the number of collisions

The catalyst alters the rate of a chemical reaction by,

• providing an alternative pathway with a lower Ea

• changing the products formed in the direction of the reaction

• providing a surface on which the molecules react

• increasing the frequencies of collisions between molecules

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NGSS.HS-PS1-5

Which of the following are true of reaction rates?

• II+III+IV

• I+IV

• II + III

• I+II+III

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NGSS.HS-PS1-5

Which factors increase the rate of a reaction?

• increasing temperature

• increasing concentration

• increasing surface area

• all of the above

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NGSS.HS-PS1-5

What letter represents the activation energy?

• A

• B

• C

• D

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NGSS.HS-PS1-4

More collisions correspond to a: 

• Faster reaction rate  

• Slower reaction rate

• Constant reaction rate 

• None of the above

Tags

NGSS.HS-PS1-5