AS Kinetics

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 

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

• temperature
• catalysts
• particle size
• polarity

Tags

NGSS.HS-PS1-5

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

Tags

NGSS.HS-PS1-5

The graph shows a typical energy distribution for particles of an ideal gas in a sealed container at a fixed temperature.   Which of the following statements is true?

• Position A represents the mean energy of a molecule in the container.
• Addition of a catalyst moves the position of E_A to the right.
• The area under the curve to the right of E_A represents the number of molecules with enough energy to react.
• The position of the peak of the curve at a higher temperature is further away from both axes.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

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

Tags

NGSS.HS-PS1-4

Which is an appropriate unit for the rate of a reaction?

• mol dm^-3 s

• mol dm^-3 s^-1

• mol dm^-3

• s

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

• Curve II is at the lower temperature and there are less molecules in the sample

• Curve II is at the lower temperature and there are the same number of molecules in the sample

• Curve II is at the higher temperature and there are more molecules in the sample

• Curve II is at the higher temperature and there are the same number of molecules in the sample

• A

• B

• C

• D

• A

• B

• C

• D