Module 14

Define reaction rate
The rate of change if a product in a chemical reaction

Closed book part of test

 

Define heterogenous catalyst

Catalysts that are in a different phase than the reactants

Closed book part of test

 

Define homogenous catalyst

A catalyst that has the same phase as at least one of the reactants

Closed book part of test

 

How can you speed up a reaction rate?

You can speed it up with heat, increased surface area, or increased concentration of reactants

Closed book part of test

 

Explain how heat can speed up a reaction

 Reactant molecules move faster as the heat increases which increases the chances of atoms colliding into each other and electrons can be rearranged or transferred

Closed book part of test

 

Explain how increasing concentration of chemical reactants

There will be more molecules to collide into with and therefore electrons can be rearranged or transferred

Closed book part of test

 

Explain how increasing surface area increases rate reaction

 Molecules or atoms can more easily mingle with the other moecules or atoms.

Closed book part of the test

 

Understand rate orders

 

 

Closed book part of the test

 

example of rate orders:

2ICl +H2 –> I+ 2HCl

 

The following reaction is determined to be first order with respect to 2HCl and H2 is determined to be zero order. What does that mean

H2 has no effect on the reaction and it would be written as:

 

R= k(2HCl)

 

I2 would be dropped since it has no effect on the equation

Closed book part of the test

 

 

example of rate orders:

2N2 + 3H2 –> 2NH3

 

 

The following reaction is determined to be second order with respect to 2N2 and first oder with respect to 3NH3  What is the overall equation

R= k(N2)2(3H2)
How is the temperature of a chemical reaction shown in a rate equation?
The rate constant (k) is dependent on the temperature of chemical reaction

Closed book part of the test

 

Understand activation energy and how it effects a reaction rate.

 

Example;

If  you have 2 different reactions but they both have the same the activation energy, what does that say about each of the reaction rates

 

B. If there are 2 different reactions but only the first one has a catalyst to speed up the reaction. Which reaction has a lower activation energy? 

 

 

 

A. The reaction times would be the same

 

B. The first one has a lower activation energy because the catalyst lowers the activation energy.

Closed book part of the test

 

Understand catalysts

 

 

Catalysts speed up the reaction rate without actually getting used up in the chemical reaction.

Open book part of the test

 

Study the examples in the book

 

14.1 page 465

14.2 pages 466-468

14.3 pages 469-471

Open book part of the test

 

Study how chemical reactions double for every 10°C increase in temperature.

 

study example 14.4 page 478

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