Chapter 14 Kinetics and rates of reactions

Question 1

rate of reaction

Answer 1

the rate at which a reaction occurs, measured in M/s`

Question 2

what are rates measured for in chemical reactions

Answer 2

concentration per second

Question 3

N2 + O2 = 2NO

rate expressed in N2

Answer 3

-delta N2/deltat

Question 4

N2 + O2 = 2NO

rate expressed in NO

Answer 4

1/2(deltaN0)/deltaT

Question 5

are the products or reactants negative and why

Answer 5

the reactants are negative because they are consumed

Question 6

average rate of reactons

Answer 6

the average rate over a given time

Question 7

3 things that affect reaction rates

Answer 7

concentration
temperatures
structures and orientations

Question 8

general formula for the rate of a reaction

Answer 8

1/a(delta molecule)/delta t

-if the molecule is a reactant than the whole system is negative

Question 9

concentration and the rate of reaction

Answer 9

if concentration increases then the rate increases

Question 10

temperature and the rate of reaction

Answer 10

if the temperature increases than the rate of reaction increases

Question 11

structure and orientation of colliding particles

Answer 11

ASK

Question 12

given a graph of concentration over time

asked for the average rate of reaction between 2 times

Answer 12

-(concentration t2 - concentration t1)/(t2-t1)

Question 13

given the concentration vs time graph can you use either products or reactants

Answer 13

yes jsut make sure to watch negatives and use the 1/a coefficient strat

Question 14

calculate the instantaneous rection rate gioven the graph or a chart of time and concentration

Answer 14

basiacally take the average which will get you the slop at the point, usually the 2 adjacent points

Question 15

rate law

Answer 15

rate = k[a]^n
k = constant
a = molecule
n = reaction order

Question 16

reaction orders can be

Answer 16

whole numbers or fractions

Question 17

how to find the reaction order given a chart of concentrations and rates

Answer 17

1. set it up as rate2/rate1 = k[a2]^n/k[a1]^n
2. use algebra to solve for n
3. take the log of both sides and use log properties for the exponent

Question 18

can a reaction have more than 1 reaction order

Answer 18

yes. it can be entirely respective to the molecule

Question 19

if the temp increaseses what happens to k

Answer 19

it also increases

Question 20

given the rate of a reactant find the rate of the product

Answer 20

use stoich to transfer the rate

Question 21

given the rate of a species in the reaction, find the rate of the entire reaction

Answer 21

find the rate as it is for a species with a coefficient of 1

Question 22

describe the graphs of the different orders of reacions

Answer 22

0 flat
1 line angled
2 curved

Question 23

how to find the rate constant k after solving for the reaction order

Answer 23

plug in eberything and solve for k

Question 24

effect of temp on rates of reactions

Answer 24

as temp increases so does the rate

Question 25

arrhenius equation

Answer 25

k = A*e^(-(Ea/RT))

Question 26

k

Answer 26

gass constant

Question 27

T

Answer 27

temp

Question 28

Ea

Answer 28

energy of activation(an energy barrier that must be surmounted for a reaction to take place)

Question 29

A

Answer 29

frequency factor( number of times the reactants approach the activation barrier per unit time