問題一覧
1
Define Combustion
the scientific word for burning
2
Define fuel
a substance that stores energy in a chemical store
3
Give an example of a fuel
hydrogen
4
What are the products of burning a hydrocarbon with sufficient oxygen?
Water, Carbon dioxide
5
What do you get during incomplete combustion?
carbon monoxide
6
Why does incomplete combustion occur?
insufficient oxygen
7
Define an exothermic reaction
A chemical reaction that releases energy
8
Define an endothermic reaction
a chemical reaction that absorbs energy
9
What happens to the temperature in an exothermic reaction?
It increases
10
What happens to the temperature in an endothermic reaction?
it decreases
11
Finish the sentence: If the energy released is greater than the energy required, the reaction is
exothermic
12
Finish the sentence: If the energy released is less than the energy required, the reaction is
endothermic
13
Breaking bonds is an ______ process
endothermic
14
Making bonds is a ________ process
exothermic
15
The reactants
absorb energy
16
The products
release energy
17
Define activation energy
the amount of energy required to break or form bonds between atoms
18
How do you calculate energy change?
energy in - energy out
19
Energy in is
bonds breaking
20
Energy out is
bonds making
21
Bonds making is
exothermic
22
Bond breaking is
endothermic
23
Define an energy level diagram
a graph showing energy change over time