KINETICS

Question 1

Describe molecular motion in a solid

Answer 1

vibration about mean lattice position

Question 2

IDEAL GAS eqn

Answer 2

PV=nRT

Question 3

Describe molecular motion in a gas

Answer 3

constant, rapid, straight line motion, colliding frequently

Question 4

Describe gaseous collisions

Answer 4

ELASTIC - no kinetic energy is lost/gained

Question 5

A typical gas at 1 atm & 25 C consists of molecules travelling at __m/s and a collision occurs within _ ns

Answer 5

500

1

Question 6

Viscosity ____ as temp. _____ due to ____ ______ energy

Answer 6

Viscosity decreases as temp. increases due to more kinetic energy

Question 7

Ions move through solvent by application of ____ ______

Answer 7

Ions move through solvent by application of potential difference

Question 8

RANDOM WALK MODEL

Answer 8

describes diffusion:

A force which represents the spontaneous tendency of molecules to disperse to a situation of greater disorder (entropy)

Question 9

Fick’s Law

Answer 9

Diffusion is greater with a steeper concentration gradient.

Question 10

Potential energy

Answer 10

molecular energy due to position

Question 11

Kinetic energy

Answer 11

energy due to motion

Question 12

how is kinetic energy distributed (motions)?

Answer 12

Rotation
Translation
Vibration

Question 13

Rate of reaction depends on

Answer 13

COLLISION FREQUENCY
Fraction with sufficient energy
Fraction with correct ORIENTATION

Physical state: SAME PHASE reactants
Conc (collision freq)
Temp. (kinetic E)
Catalysts (Ea)

Question 14

State general rate law

Answer 14

rate = k[A]n[B]m

Question 15

Arrhenius equation

Answer 15

k=Ae(^Ea/RT)

Question 16

State 3 ways how catalysts work

Answer 16

Activate reactant TM chemistry
Stabilise transition state
Different reaction mechanism

Question 17

3 ways to measure rate

Answer 17

gaseous
spectrophotometric
conductivity

Question 18

KINETICS

Answer 18

study of rates of reactions

Question 19

ORDER of reaction

Answer 19

sum of exponents of concs in rate law

Question 20

first order differential rate law

Answer 20

rate = k[A]

Question 21

first order RDS

Answer 21

Carbocation formation

Only alkyl dependent

Question 22

first order integrated rate law

Answer 22

ln[A] = ln[A]0 - kt

Question 23

Sketch a ln conc-time graph

Answer 23

SLOPE = -k

Question 24

First order half life

Answer 24

t(1/2) = 0.693/k