Kinetics

State why the curve starts at the origin

EQ

No molecules with no energy

Explain the effect that lowering the temperature would have on the rate of reaction

EQ

Faster rate of reaction

Explain the effect that this change has on the rate of reaction

EQ

Amount of gas prevent reduced

What does the area under the curve represent?

The total number of practicals

B

A

B

C

Which

Which statement is correct for the distribution curve of molecular energies in a gas?

True or false

Curve is symmetrical about the maximum

False

Is this likely to decrease the accuracy of the experiment?

Rinsing the flask with acid before each new experiement

EQ

Yes

Which statement is correct about the time taken for the cross to disappear when using the larger conical flask?

EQ

The time taken will be increased by using the larger conical flask

Suggest why the student record the times to the nearest second and not the nearest 0.1 s

EQ

Hard to judge to the nearest 0.1 second

Suggest why the students chose not to carry out experiments at temperatures in the range 1-10C

EQ

Reaction would take too long

Do particles in a sample have the same kinetic energy at the same temperature

EQ

Yes

How does Maxwell Boltzmann distribution curve change at a higher temp

Lower and right

How does the maxwell botlzmann curve change at lower conc

Lower graph shape by same factor lower

Explain why a small increase in temperature causes a large increase in the rate of reaction

EQ

More particles have the activation energy

More frequent and successful collision per unit volume

Which statement is correct for the distribution curve of molecular energies in a gas?

True or false

There are always some molecules with zero energy

EQ

False

Which statement is correct for the distribution curve of molecular energies in a gas

True or false

The position of the maximum of the curve is not dependant of the temperature

False

Which statement is correct for the distribution curve of molecular energies in a gas

True or false

The position of the maximum of the curve is not dependant on the temperature

False

Which statement is correct for the distribution curve of molecular energies in a gas

True or false

The mean energy of the molecules is greater than the most probable energy of the molecules

True