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Year 8 energy changes in reactions

Last updated 5 months ago
12 questions
4
Complete this and then write out the correct answers as notes in your exercise book.
Other Answer Choices:
increases
enters
Escapes
decreases
1

What is the final temperature for reaction B? Write your answer in the table.

5

Classify the variables in this experiment

  • Chemical used
  • Temperature change
  • Mass of chemical reacted
  • Concentration of chemical reacted
  • Volume of liquid heated
  • Independent variable
  • Dependant variable
  • Control variable
1

What name is given to reactions that heat the surroundings?

1

Which reaction, A, B, or C, would be best to use in a hand warmer?

1
Give a reason why you chose this reaction.
This reaction had the ____________ change in temperature.
Other Answer Choices:
lowest
highest
3
What measurements would the student make to show that the reaction is exothermic?
Measure the ____________ with a ________________ .
Add the reactants together.
Measure the ____________ temperature with the same ________________
Other Answer Choices:
thermometer
maximum
initial
1
How would these measurements show that the reaction is exothermic?
The temperature would _____________
Other Answer Choices:
increase
stay the same
decrease
1

The exothermic reaction makes the temperature of the engine

1

This is because during exothermic reactions

1

Which one of the substances shown in the equation is a compound? Give the formula of this compound.

2NO → N2 + O2

2
Why is it important to stop carbon monoxide (CO) from being released into the air?

Carbon monoxide is __________ as it stops the red blood cells being able to transport ___________
Other Answer Choices:
Carbon dioxide
oxygen
Hydrogen
flammable
toxic