C3

HideShow resource information
  • Created by: apple87
  • Created on: 17-03-14 16:39
What is an exothermic reaction?
An exothermic reaction is on which gives out energy to the surroundings, usually in the form of heat, this is shown by a rise in tmeperature.
1 of 21
What is an endothermic reaction?
An endothermic reaction is one which takes energy in from the surroundings, usually in the form of heat, which is shown by a fall in tmeperature.
2 of 21
What sort of reaction is bond breaking?
Endothermic
3 of 21
What sort of reaction is bond forming?
Exothermic
4 of 21
What is the calorimetric method?
Weigh the fuel, measure water in to a copper calorimeter, take initial temperature of water, heat water by 20-30 degrees, reweigh fuel
5 of 21
How do you find the energy output per gram of fuel?
Energy transferred= mass of water*shc of water*temp change, energy output per gram= emergy released/mass of fuel burned.
6 of 21
What is atom economy?
The percentage of reactants changed to usful products.
7 of 21
How do you calculate atom economy?
(Total of desired products/total of all products)*100
8 of 21
How is high atom economy better for the environment and profits?
Low economy uses up resources quickly, waste has to be disposed of, unprofitable.
9 of 21
What is percentage yeild?
Compares actual and predicted yeild, tells you about the overall success.
10 of 21
How do you work out the percentage yeild?
(actual yeild/perdicted yeild)*100
11 of 21
What ways can some of the product get lost?
Evaporation, not all the reactants make a product, filteration, transfering liquids
12 of 21
What is batch production?
Only operates at certain times, its felixible- several products can be made using the same equipment, start up costs are low- off the self equipment, labour intensive- equipment needs to be set up manually, and cleaned at the end, quality can differ
13 of 21
What is continuous production?
Production never stops- don't waste time cleaning, rusn automatically, quallity is consistant, start up costs are huge
14 of 21
When is batch production used?
Pharmaceutical drugs- complicated fairly low demand for them
15 of 21
When is coninuous production used?
Large scale industrial processes eg harber process, ammonia
16 of 21
What are allotropes?
Allotropes are differnt structural forms of the same element in the same physical state.
17 of 21
Why is dimond used as jewellrey and as cutting tools?
Lustrous(Sparkly) and colourless- Each atom has four covalent bonds, very rigid this makes it really hard. Takes lots of energy to break covalent bonds, gives it a high melting point. Doesn't conducts electricity, it has not free electron.
18 of 21
How does a graphite pencil work?
The atoms have only 3 covalent bonds, sheets of carbon atoms can slide over eachother, they can be rubbed off onto paper. Gaphite gots a high melting point. Spare electrons means it conducts electricity.
19 of 21
What is a fullerene?
Molecules of carbon shaped like closed tubes of hollow balls. Can be used to cage other molucules- eg for delivering a drug.
20 of 21
What is a nanotube?
Fullerenes can join together have large surface areas to work as great catalysts.
21 of 21

Other cards in this set

Card 2

Front

What is an endothermic reaction?

Back

An endothermic reaction is one which takes energy in from the surroundings, usually in the form of heat, which is shown by a fall in tmeperature.

Card 3

Front

What sort of reaction is bond breaking?

Back

Preview of the front of card 3

Card 4

Front

What sort of reaction is bond forming?

Back

Preview of the front of card 4

Card 5

Front

What is the calorimetric method?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Chemical economics resources »