MEDIUM
Lower Secondary Stage 9
IMPORTANT
Earn 100

Why might some exothermic reactions be dangerous to do in a school laboratory?

Important Questions on Energy Transfers in Chemistry

MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>Exercise 5>Q 3
The reaction of elements in group 1 with water is an exothermic reaction. Explain why some of these reactions cannot be safely in school.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>Exercise 9>Q 5
Using the words 'energy transfer' and 'temperature', explain what an endothermic reaction is.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>Exercise 9>Q 6
A student reacts, two solutions by mixing them and measures the start and final temperatures of the mixture. How would the student know from his results that the reaction was endothermic?
HARD
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>Exercise 9>Q 7
Draw a table that summarises the differences between exothermic and endothermic reactions. Include two examples of each type of reaction.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>Exercise 10>Q 1
Explain why melting is an endothermic reaction.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>Exercise 10>Q 2
Why does sweating causes cooling?
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>Exercise 10>Q 3
Explain in terms of energy transfer why ice cream melts.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 8 - Energy Transfers in Chemistry>Exercise 10>Q 4
How will the rate of the evaporation increase if the temperature of a liquid is increased? Explain your answer.