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