Chapter 13 - Rates of reaction Flashcards

1
Q

What is the rate of reaction?

A

The change of concentration with time.

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2
Q

What is the formula for rate of reaction?

A

Average rate = c2-c1/t2-t2

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3
Q

What is catalyst?

A

A substance that increases the rate of reaction without undergoing permanent chemical change in the reaction.

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4
Q

What is a heterogeneous reaction?

A

Reactions that occur at the interface between two phases, such as between a gas and a solid or between a solution and a solid.

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5
Q

What is a homogeneous reaction?

A

A reaction in which the reactants are present as a homogeneous mixture either as a mixture of gases or as a solution.

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6
Q

What are the factors that influence the rate of homogeneous reaction?

A
  • concentration of the reactants
  • nature and concentration of any catalyst
  • temperature.
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7
Q

What does the collision theory of reaction rates propose?

A

For chemical reaction to occur, the reactant particles must -
- collide
have more than a certain minimum amount of kinetic energy
- be correctly orientated

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8
Q

What is activation energy?

A

The minimum amount of energy reactants must have to undergo reaction.

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9
Q

What are enzymes?

A

Biological catalysts. They are protein that bring about important reactions in all living cells.

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