Reaction rates and experiment

Question 1

what is rate of reaction

Answer 1

• the rate of reaction is the measure of how quickly a reaction occurs
• measuring how quickly reactants are used up or products are formed

Question 2

what is the formula for rate of reaction

Answer 2

• amount of reactant used of product formed/ time

Question 3

what are the different ways rate of reaction can be measured

Answer 3

• precipitation
• change in mass
• volume of gases given off

Question 4

rate of reaction: precipitation

Answer 4

• you need two see through solutions
• mix the two reactants together and but the flask on a piece of paper with an x on it
• observe the mark and measure how long it takes to disappear with a stop watch
• 1/time taken to obscure= rate of reaction

Question 5

rate of reaction: change in mass

Answer 5

• you can measure the rat of reaction that produces a using a mass balance
• as gas is releases mass decreases on the balance the faster the reading drops the faster the rate of reaction
• a graph showing change in mass / time can be mase

Question 6

rate of reaction: volume

Answer 6

• use a set time interval and a gas syringe
• and measure the amount of gas given off within the time period
• the more gas given off the aster the rate of reaction
• the results can be used to plot a gas volume against time passed

Question 7

what is the practical of hydrochloric acid and marble chips

Answer 7

• measure the volume of gas used with a gas syringe
• take reading at regular time intervals
• plot a graph time on the x axis and volume on y axis

part two

• repat experiment with the same volume and concentration of acid, same mass of marble chips
• just have them crushed up and see the difference in rate of reaction

Question 8

Explain the reaction with dilute HCL

Answer 8

• This reaction is good for measuring the effects
  of changing the concentration on reaction rate
• The reaction gives off hydrogen gas
• measure the loss of mass as the gas is formed using a mass balance.
• take readings of the results in regular time intervals
• work out mass lost at each reading
• repat experiment with same mass of mg and same volume of acid but use a different concentration of acid

Question 9

What is the relationship between rate and time

Answer 9

• The longer something takes the slower the rate
• rate is inversely proportional to time

Question 10

how to interpret a rate of reaction graph

Answer 10

• Find two points on the line that are easy to read
• the × and y values
• firm a triangle with two points that pass through the graph
• The height of your triangle = change in y
• The base of your triangle = change In X
• use the formula to work out the gradient, and therefore the rate.
• Gradient = change in y ÷ change in x