Elevise
  • Home
  • GCSE Maths
  • GCSE Science
  • Membership
Back to C6 Home
C6: Quiz 4 – Answers

1)

a) 1.83 cm3/s (±0.1)

b) 0.71 cm3/s (±0.1)

c) 14 to 16 seconds

d) 0.87 to 1 cm3/s

 

2)

a)

Picture

b) Anytime between 26 and 30 seconds

c) 0.43-0.5 g/s

d) 0.41 g/s (±0.05)

e) 0.21 g/s (±0.05)

 

3)

a)

i) The tangent at 2 seconds (the graph also shows the tangent at 15 seconds for part b)

Picture

ii) 1.8 g/s (±0.2)

b) 0.35 g/s (±0.1)

 

4)

a)

i) The tangent at 2.5 seconds (the graph also shows the tangent at 20 seconds for part b)

Picture

ii) 1.6 cm3/s (±0.2)

b) 0.18 cm3/s (±0.1)


Questions
Click here for a printable PDF of the graphs in this quiz.
​
1) The rate of reaction graph below shows the volume of gas produced over time.
Picture
a) Work out the mean rate of reaction between 0 and 6 seconds. Give your answer to 2 decimal places and include the units in your answer.
b) Work out the mean rate of reaction between 3 and 10 seconds. Give your answer to 2 decimal places and include the units in your answer.
c) When does the reaction end?
d) Calculate the mean rate of reaction for this whole reaction. Give your answer to 2 decimal places and include the units in your answer.
 

​2) Parts a and b for this question appeared in the previous quiz. Therefore, feel free to use the graph that you drew in the previous quiz rather than drawing the graph again.
A student investigated the rate of reaction by measuring mass lost against time. His results are shown in the table below.
Picture
a) Plot his results on the graph below.
Picture
​b) At what time does the reaction stop?
c) Calculate the mean rate of reaction for the whole reaction. Give your answer to 2 decimal places and include the units in your answer.
d) Calculate the mean rate of reaction between 5 and 16 seconds. Give your answer to 2 decimal places and include the units in your answer.
e) Calculate the mean rate of reaction between 14 and 21 seconds. Give your answer to 2 decimal places and include the units in your answer.
 
 
3) We have the rate of reaction graph below.
Picture
a) The subparts for part a will help you find the rate of reaction at a particular time.
i) Draw a tangent to the curve at 2 seconds.
ii) Use your tangent to work out the rate of reaction at 2 seconds. Give your answer to 2 significant figures and include the units in your answer.
b) Work out the rate of reaction at 15 seconds. Give your answer to 2 significant figures and include the units in your answer.
 
​
4) We have the rate of reaction graph below.
Picture
a) The subparts for part a will help us find the rate of reaction at a particular point.
i) Draw a tangent to the curve at 2.5 seconds.
ii) Use your tangent to work out the rate of reaction at 2.5 seconds. Give your answer to 2 significant figures and include the units in your answer.
b) Work out the rate of reaction at 20 seconds. Give your answer to 2 significant figures and include the units in your answer.
Back to Questions
Home
GCSE Maths
GCSE Science
Membership
Tuition
United Kingdom
[email protected]
  • Home
  • GCSE Maths
  • GCSE Science
  • Membership