Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

FINISHED > C7.1 What are the characteristics of green chemistry? > Flashcards

C7.1 What are the characteristics of green chemistry? Flashcards

1
Q
  1. What are the several stages that the production of useful chemicals involves?
A 
1- the preparation of feedstocks
2- synthesis
3- separation of products
4- handling of by-products and wastes
5- the monitoring of purity
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q
  1. What does the PREPERATION OF FEEDSTOCKS stage of the production of useful chemicals include?
A

-raw materials → feedstocks
(e.g. crude oil, natural gas) e.g. (hydrogen, ethanol),
by being purified or changed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
  1. What are feedstocks?
A
  • reactants needed for chemical processes
  • raw materials → feedstocks
    e. g. (hydrogen, ethanol),
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
  1. What are raw materials?
A
  • naturally occurring substances

(e. g. crude oil, natural gas)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
  1. What does the SYNTHSIS stage of the production of useful chemicals include?
A

-feedstocks→ products
converted by chemical processes
-conditions are controlled so reaction happens at a sensible rate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q
  1. What does the SEPERATION OF PRODUCTS stage of the production of useful chemicals include?
A

-products separated from by-products and left over reactants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
  1. What are by-products?
A

-other chemicals made in chemical reactions that can be waste or useful

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q
  1. What does the HANDLING BY PRODUCTS AND WASTE stage of the production of useful chemicals include?
A
  • by-products may be sold or used in another reaction
  • if exothermic reaction, heat exchangers use heat to boil water for other reactions
  • waste products carefully disposed of following legal requirements
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q
  1. What does the MONITORING THE PURITY OF PRODUCT stage of the production of useful chemicals include?
A
  • purity is monitored to make sure between certain levels

- different industries need different levels of purity, purifying costs money so if they don’t need it they won’t

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q
  1. What is a sustainable process?
A

-a process that meets the needs of people today without affecting the ability of future generations to meet their own needs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q
  1. What does the sustainability of any chemical process depend on?
A

1- whether or not the feedstock is renewable
2- the atom economy
3- the nature and amount of by-products or wastes and what happens to them
4- the energy inputs or outputs
5- the environmental impact
6- the health and safety risks
7- the social and economic benefits

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q
  1. What is the importance of WHETHER OR NOT THE FEEDSTOCK IS RENEWABLE in the sustainability of chemical processes?
A

-if non-renewable it will run out so future can’t have it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q
  1. What is the importance of ATOM ECONOMY in the sustainability of chemical processes?
A
  • tells you how much mass of reactants end up as useful products
  • low atom economy= lots of waste, use up resources
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q
  1. What is the importance of THE NATURE AND AMOUNT OF BY-PRODUCTS OR WASTES AND WHAT HAPPENS TO THEM in the sustainability of chemical processes?
A
  • waste= expensive to remove and dispose of responsibly/ takes up space and pollute
  • to improve= could make use of by-product or choose reactions with better by-products/ less waste products
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q
  1. What is the importance of THE ENERGY INPUTS AND OUTPUTS in the sustainability of chemical processes?
A
  • energy input= expensive, combustion of fuels is bad for environment
  • energy output= could use it for other processes= saves money and environment
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q
  1. What is the importance of THE ENVIRONMENTAL IMPACT in the sustainability of chemical processes?
A
  • harmful chemicals produced
  • raw material extracted
  • transporting reactants or products
17
Q
  1. What is the importance of THE HEALTH AND SAFETY RISKS in the sustainability of chemical processes?
A
  • laws for safety of public and workers

- tests for safety of use

18
Q
  1. What is the importance of SOCIAL AND ECONOMIC BENEFITS in the sustainability of chemical processes?
A
  • social: +jobs for money, -unsightly and hazardous

- economic: cost>income= not profitable

19
Q
  1. What is activation energy?
A

-the energy needed to break bonds to start a reaction

20
Q
  1. What is a catalyst?
A
  • it changes the speed of a reaction without being changed or used up
  • it provides an alternative route for a reaction with a lower activation energy
21
Q
  1. What do some industrial processes use?
A

-enzyme catalysts to speed up reactions

22
Q
  1. What are the restrictions on the conditions that are used of using enzyme catalysts?
A

-temperature and pH or the enzymes will be denatured if too high or work too slowly if too low

FINISHED (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions