MEDIUM
Lower Secondary Stage 9
IMPORTANT
Earn 100

Petro is making some biscuits. The first step is to melt some butter in a pan. What could he do to make the butter melt quicker?

50% studentsanswered this correctly

Important Questions on Reactivity and Rates of Reaction

EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 7 - Reactivity and Rates of Reaction>Exercise 3>Q 6
Use ideas about particle theory to explain why increasing the temperature of a solution increases the rate of reaction.
EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 7 - Reactivity and Rates of Reaction>Exercise 3>Q 8

The diagram shows three glasses of orange squash.

Question Image 

Which glass contains the lowest concentration of orange squash? Give a reason for your answer.

MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 7 - Reactivity and Rates of Reaction>Exercise 3>Q 10
Angelique is making a campfire with her little brother. She asks him to go and find some small pieces of wood to burn. Her brother returns with a large tree trunk. Explain why Angelique sends her brother away again saying ‘Only small pieces of wood will work'.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 7 - Reactivity and Rates of Reaction>Exercise 3>Q 11
The contact process in an industrial method for making sulphuric acid that uses a vanadium oxide catalyst. Write two reasons why many industrial processes use a catalyst.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 7 - Reactivity and Rates of Reaction>Test-style questions>Q 1

Aiko investigates the reaction between magnesium and hydrochloric acid.

She adds a 1 Cm length of magnesium to 25 cm3 of the acid.

She measures the time it takes for all the magnesium to react.

She then repeats the experiment at different temperatures.

The table shows her results:

Temperature Time for magnesium (s)
20 181
30 112
40 49
50 43
60 26

What is missing from the table?

EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 7 - Reactivity and Rates of Reaction>Test-style questions>Q 1

Aiko investigates the reaction between magnesium and hydrochloric acid.

She adds 1 Cm length of magnesium to 25 cm3 of the acid.

She measures the time it takes for all the magnesium to react.

She then repeats the experiment at different temperatures.

The table shows her results:

Temperature °C Time for magnesium (s)
20 181
30 112
40 49
50 43
60 26

Which temperature shows the fastest reaction?

MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 7 - Reactivity and Rates of Reaction>Test-style questions>Q 1

Aiko investigates the reaction between magnesium and hydrochloric acid.

She adds 1 Cm length of magnesium to 25 cm3 of the acid.

She measures the time it takes for all the magnesium to react.

She then repeats the experiment at different temperatures.

The table shows her results:

Temperature ° C Time for magnesium (s)
20 181
30 112
40 49
50 43
60 26

Which data point does not fit the pattern? What should Aiko do with this data point?

MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 7 - Reactivity and Rates of Reaction>Test-style questions>Q 2

Mary and Mia are making lemonade. They add some sugar to make it sweeter. Mary adds three sugar cubes to her lemonade. Mia adds the same mass of sugar granules to her lemonade.

Whose sugar will dissolve first? Give a reason for your answer.