(3) Rate of Reaction

Question 1

equation to find rate of reaction

Answer 1

change of conc/time

Question 2

what happens when rate is increased

Answer 2

frequency of collisions inc and no. of particles with energy greater than Ea

Question 3

what factors affect rate

Answer 3

temp and conc

Question 4

how does temp affect rate

Answer 4

inc temp, inc Ek of particles, inc collisions, inc successful collisions in given time (inc rate)

Question 5

how does conc affect rate

Answer 5

inc conc, inc no. of particles in a volume, more successful collisions in given time (inc rate)

Question 6

what is rate determining step

Answer 6

the speed of the slowest step in a reaction

Question 7

what is the rate equation

Answer 7

rate=k[A]ᵐ[B]ⁿ

Question 8

what is k in a rate equation

Answer 8

rate constant if temp and Ea is constant

Question 9

define order of reaction

Answer 9

the power to which conc of a reactant is raised in the rate equation

Question 10

what is the overall order of a reaction

Answer 10

the sum of the power to which the conc of a reactant is raised

Question 10

zero order

Answer 10

conc does not affect rate (doesn’t appear in equation)

Question 11

first order

Answer 11

whatever happens to conc, same happens to rate (directly proportional)

Question 12

second order

Answer 12

whatever you to do conc, the square of that happens to rate (triple conc, 3² rate)

Question 13

rate constant unit 1,2,3,4,5

Answer 13

s⁻¹
mol⁻¹dm³s⁻¹
mol⁻²dm⁶s⁻¹
mol⁻³dm⁹s⁻¹
mol⁻⁴dm¹²s⁻¹

Question 14

what experient would you use a colorimeter

Answer 14

if substance is coloured

Question 15

what experiment would you use a gas syringe

Answer 15

if product is a gas (volume of gas over time)

Question 16

what experiment would you use a flask and balance

Answer 16

if product is gas (mass of gas over time)

Question 17

what experiment would you record pH

Answer 17

if H⁺ or OH⁻ ions are present in reaction

Question 18

why do you quench a sample in titrations and how would you do so

Answer 18

to stop the reaction, rapid cooling/add large vol. of water/add chemical to remove reactant not being monitored

Question 19

when are progressive rate methods used

Answer 19

during reaction

Question 20

zero order conc-time graph

Answer 20

\

Question 21

first order conc-time graph

Answer 21

◟

Question 22

second order conc-time graph

Answer 22

◟

Question 23

when are inital rate methods used

Answer 23

when reaction starts (t=0)

Question 24

zero order rate-conc graph

Answer 24

_____

Question 25

first order rate-conc graph

Answer 25

/

Question 26

second order rate-conc graph

Answer 26

◞

Question 27

what is a nucleophile

Answer 27

a molecule that is attracted to a positive charge

Question 28

when RDS uses 2 molecules (hydrolysis)

Answer 28

biomolecular nucleophilic substituion (Sᴺ2)

Question 29

how to know what is involved in RDS

Answer 29

molecules included in the rate equation (not zero order)

Question 30

when RDS uses 1 molecule (hydrolysis)

Answer 30

unimolecular nucleophilic substitution (Sᴺ1)