C7 Energy Changes in Reactions Flashcards
1
Q
What is an exothermic reaction?
A
Energy is being emitted to the surroundings, increasing the temperature.
2
Q
What is an endothermic reaction?
A
Energy is being taken in from the surroundings, causing it to decrease in temperature.
3
Q
Give an example of an exothermic reaction.
A
Hand Warmers
4
Q
Give an example of an endothermic reaction.
A
Sports Injury Pack
5
Q
Explain why a polystyrene cup is used in the practical.
A
To insulate the heat and stop it from escaping, improving precision.
6
Q
If energy is needed, what is happening to the bonds?
A
The bonds are being made
7
Q
If energy is released, what is happening to the bonds?
A
The bonds are being broken.
8
Q
How do you calculate the energy change in reaction?
A
Total bond energies of reactants - Total bond energies of products.
