• Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

Card Range To Study



Play button


Play button




Click to flip

Use LEFT and RIGHT arrow keys to navigate between flashcards;

Use UP and DOWN arrow keys to flip the card;

H to show hint;

A reads text to speech;

26 Cards in this Set

  • Front
  • Back

Define rate of reaction?

how fast a chemical change is takign place in terms of how fast reactants are removed or how fast products are formed in a given time

Rate of reaction equation?

Rate= Change in concentration of reactants or products/ Time

Units of rate of reaction?

moldm-3 s-1

What must be stated with any result when measuring rate of reaction and remain constant?

Temperature-it's value must be stated and recorded

Give 6 examples of how to meausre the rate of reaction

1) Volume of gas produced (gas syringe or water displacement)

2) Mass decrease when gas is evolved (balance)

3) colour intensity change (colorimetry)

4) pH when acids or alka;os are involved: pH probe and meter

5) Stop reaction at intervals and titrate each time (quenching)

6) Conductivity-ions produced/used

What is the shape of a concentration time graph for a reaction of order?

a negative gradient (straight line) ( due to reaction rate being constant)

What is the shape of the concentration-time graph for a overall reaction of 1st order?

Negative gradient decreases gradually over time (due to reaction depending on reactant concentraion)

What shape is the concentration-time graph for a second order reaction comapred to a first order reaction?

Second order had a much more steeper curve than first order

Define half life

The half life of a reactant is the time it takes foor it's concentration to reduce by half

What is the rule for the half life of first order reactants?

'If a reaction is 1st order with respect to a reactant, then the half-life is constant and independent of the concentration

What happens to half life of 0 order reactant?

decreases over time

What happens to half life of 2nd order reactant?

Increases over time

What is the shape of a reaction rate-concentration graph for a 0 order reactant?

Straight line, no gradient

What is the shape of a reaction rate-concentration graph for a 1st order reactant?

A straight line through the origin ( reaction rate is directly proportional to concentration of reactant)

What is the shape of a reaction rate-concentraion graph for a 2nd order reactant?

Expotentially increases (reaction rate is directly proprotional to concentration of the reactant SQUARED)

Describe intitial rates metod

Several different experiments are carried out, where in each separate experiment the initial reaction rate is estimated for one different initial reactant concentration with all other variables unchanged

What is approximately true about the the initial rate of reaction?

The rate of reaction is constant

Equation of initial reaction rate is:

[reactant] (initial) - [reactant] (t) / time,t

What was the clock reaction?

Initial rate is appromiately directly proportional to 1/t

If total volume was kept constant, the solution used with be proportional to it's concentraion

what is the rate determining step in a reaction mechanism?

The slowest step and controls how fast the reaction proceeds

How can you determine the order of reactants from the rate determining step?

'The number of each chemical species reacting in the rate determining step equals its orderin the rate equation'

What happens to the Rate constant (k) when temperature increases?

Rate constant is only constant at constant temperature; k increases dramatically (exponentially) when temperature increases and therefore so does rate

What does the Arrheuis equation show?

Shows the exponential relationship between the rate constant K and absolute temperature T (in kelvin)

In the data book, what form is the Arrheuius equation in?

y = mx + c

What is the equation to work out Activation energy? (Ea)

Ea = - (m (gradient) x R (Gas constant)

What is the equation to work out A (frequency of successful collisions)?

e c (to the power of c-which is the intercept)