CHEMICAL KINETICS

The following data were measured for the reaction

BF₃(g) + NH_3(g) ⟶ F₃BNH_3(g)

What is the rate law for the reaction?

• rate = k[NH₃]

• rate = k[BF₃]²[NH₃]

• rate = k[BF₃][NH₃]

• rate = k[BF₃][NH₃]²

Tags

NGSS.HS-PS1-5

Given the following rate law,

rate = k[A]²[B]

if [A] were doubled, what must happen to [B] to keep the rate constant?

• [B] must quadruple

• [B] must double

• [B] must be havled

• [B] must be quartered

Tags

NGSS.HS-PS1-5

rate = k[A]

The rate constant in the rate law above is 0.5 L/mol·s. If the initial concentration of A is 0.1 M, how long will it take for [A] to drop to 0.025 M?

• 0.7 s

• 1.4 s

• 2.8 s

• There is not enough information given.

Tags

NGSS.HS-PS1-5

What is the rate law for this mechanism?

• rate = k[A][B]²

• rate = [B][X]²

• rate = [A]^0.5[B]^1.5

• rate = [W][Y][Z]

Which factors increase the rate of a reaction?

• increasing temperature

• increasing concentration

• increasing surface area

• all of the above

Tags

NGSS.HS-PS1-5

What is the theory which explains how chemical reaction occurs?

• Diffusion 
• Big Bang
• Collusion
• Evalusion

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-2

What is the energy needed for reactant particles to change into products? 

• Potential
• Kinetic
• Activation
• Conversion

Tags

NGSS.HS-PS1-4

Which of the following best describes why increasing temperature increase reaction rate?

• Activation energy is reduced.

• Collisions become more frequent.

• Collisions become more energetic.

• Collisions become more frequent and more energetic.

Tags

NGSS.HS-PS1-5

What letter represents the activation energy?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

What is the parameter to measure the rate or speed of a reaction beside time?

• Change in volume

• Change in concentration

• Change in pressure

• Change in temperature