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