Exothermic and Endothermic reactions Flashcards
1
Q
What happens to energy in chemical reactions?
A
Energy is conserved in chemical reactions. the total energy of the system is the same before and after the reaction.
2
Q
What is an endothermic reaction?
A
The reaction is cooler than the surroundings, it takes heat in.
3
Q
What is an exothermic reaction?
A
The reaction is hotter than the surroundings, it lets the heat out.
4
Q
Give an example of an endothermic reaction.
A
Ice melting.
5
Q
Give an example of an exothermic reaction.
A
Fire burning.
6
Q
When hydrochloric acid and sodium hydrochloric were the reactants in a chemical reaction, the initial temperature was 18° and the final temperature was 30°.
a) What was the temperature change?
b) Is it an endothermic or an exothermic reaction?
A
a) + 12°
b) exothermic (it’s +° and not -°)
