18.3 - Rate-concentration graphs and initial rates Flashcards Preview

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Flashcards in 18.3 - Rate-concentration graphs and initial rates Deck (13):
1

What is the Y-axis on a rate-concentration graph?

Rate

2

What is the X-axis on a rate-concentration graph?

Concentration

3

Describe a rate-concentration graph for a reactant with zero order

Horizontal straight line

4

Describe a rate-concentration graph for a reactant with first order

Straight-line, positive correlation

5

Describe a rate-concentration graph for a reactant with second order

Upward curve, increasing gradient

6

What represents the rate constant on a zero order reactant rate-concentration graph?

The Y-intercept

7

What does the gradient of a first order rate-concentration graph represent?

The rate constant

8

How do you find the rate constant using a second order rate-concentration graph?

1) Plot a graph of the rate against concentration squared
2) Calculate the gradient

9

What is a common clock reaction?

Iodine clocks

10

Explain how an iodine clock reaction works

Starch added to aqueous iodine to form iodine
Time how long it takes until a blue-black solution forms

11

How do you work out the initial rate from a clock reaction?

The initial rate is proportional to 1/T

12

How can you determine the order of reactant from a clock reaction?

Plot graph of 1/T against concentration
Look at the shape of the graph

13

What is the Y-axis of a rate-concentration graph for a clock reaction?

1/T