Reaction Rates/ Orders

What is the best definition of rate of reaction?

• The time it takes to use up all the reactants

• The rate at which all the reactants are used up

• The increase in concentration of a product per unit time

• The time it takes for one of the reactants to be used up

What two factors govern whether a collision between reacting particles will be effective?

• orientation and potential energy 
• kinetic energy and temperature 
• kinetic energy and orientation 
• potential energy and kinetic energy 

More collisions correspond to a: 

• Faster reaction rate  
• Slower reaction rate
• Constant reaction rate 
• None of the above

Which of the following is NOT a factor affecting reaction rate?

• temperature
• catalysts
• particle size
• polarity

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions
• it only increases the frequency of particle collisions
• it only increases the energy of particle collisions
• it reduces the activation energy of the reaction

Which of the following increase the reaction rate?

• less surface area

• lower temperature

• increasing pressure

• increased concentration

What is the activation energy?

• The energy of the products
• The energy of the reactants
• The minimum energy needed by the reactants to form the products.
• The energy lost in the reaction

Consider the following data for the reaction:

A+2B → C+D

Deduce the order of reaction with respect to A and with respect to B

• A is first order and B is second order.

• A is second order and B is first order.

• A is first order and B is first order.

• A is second order and B is second order.

Consider the following data for the reaction:

A+2B → C+D

Work out a value for the rate constant of this reaction with units.

• 10 mol-2dm6s-1

• 10 mol-dm3s-1

• 5 mol-2dm6s-1

• 5 mol-dm3s-1