Maxwell-Boltzmann Kinetics

Which of the following is FALSE for Maxwell Boltzmann distribution curve?

• Area under curve represent number of particles

• Increase in temperature will shift the curve to right

• High temp, fraction of molecules with energy > E_a increases

• At higher temp, area under curve is greater than at low temp

Tags

NGSS.HS-PS1-5

The graph shows the speed distribution of molecules in a sample of a gas at a certain temperature. Which of the following graphs shows the speed distribution of the same molecules at a lower temperature? (as a dashed curve)

• 
• 
• 
• 

Which of the following best explains how a catalyst increases the rate of reaction?

• a catalyst provides an alternative pathway of lower activation energy

• a catalyst provides an alternative pathway of higher activation energy

• a catalyst provides an alternative pathway of lower activation energy for the forward reaction only

• a catalyst provides an alternative pathway of lower activation energy for the back reaction only

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Which numbered interval on the diagram would change when a catalyst is added?

• B & C

• C & D 

• E & C

• A & D 

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

If the temperature is reduced, a reaction rate will ______

• increase

• decrease

• stay the same

Tags

NGSS.HS-PS1-5

If the concentration of a reactant is increased, the reaction rate will ___________.

• increase

• decrease

• stay the same

Tags

NGSS.HS-PS1-5

Which of these will NOT speed up the rate of reaction between a strip of magnesium and hydrochloric acid?

• tightly coil up the strip of magnesium

• cut up the strip of magnesium

• increase the concentration of the hydrocholoric acid

• increase the temperature of the hydrocholoric acid

Tags

NGSS.HS-PS1-5

Grinding a seltzer tablet into powder increases the rate of reaction due to...

• increased concentration of reactants

• increased surface area

• increased speed of particles.

• better orientation of reactants

Tags

NGSS.HS-PS1-5

What can change the rate constant, k of a reaction?

• catalysts

• temperature

• concentration

• surface area

Tags

NGSS.HS-PS1-5

Under the collision theory, the particles must collide with  ____ and ____ for a reaction to occur.

• sufficient rate and sufficient energy

• sufficient surface area and correct orientation

• sufficient catalyst and sufficient energy

• sufficent energy and correct orientation