A presentation for FORM 4 CHAPTER 5.8 for the Science government syllabus in Malaysia.

1. 5.8 Innovative Efforts in the Design of Equipment
Using Chemical Reactions As Source of Energy
Qua Wen Wei & Brenda Tan
4 Faraday

2. Proper Way of
Disposing of Electric
Cells
Reduce – Do you really need that new cell phone,
stereo, computer or TV? Although electronics are
made to last years, many feel the need to buy
new products as soon as they are available. And
it seems as though companies are cranking out
the next model before you even have a chance to
snip your proof-of-purchase for that rebate.
Preventing waste by reducing electronic
consumption is preferable to any waste
management option.

3. Reuse – While you are trying to find a purpose for
your unused electronics, the boxes they’re in are
collecting dust in the garage. Meanwhile, their
useful life is wasting away until the time comes
when you decide they need to be thrown away.
Just because you have the newest iPod or TV
doesn’t mean someone else won’t appreciate the
perfectly good older model. Donating used
electronics to schools, non-profit organizations,
and low-income families is a great way to
lengthen the life of electronic products and keep
them out of the waste stream longer.

4. Recycle – If a product is no longer in
condition to be used, don’t just throw it
away! There are precious parts and
ingredients in electronic devices that can
be recycled. The metal, plastics, batteries
and packaging materials in products like
cell phones can be used for new products.
Metals like gold, silver, platinum,
palladium, rhodium, copper, tin, lead,
brass and zinc can be recovered and used
for jewellery, plating, electronics,
plumbing, automotive and art foundries.

5. Proper Way To Dispose Electric
Cells
Video

6. Battery Recycling at MRI Waste
Facility

7. Using energy efficiently to
prevent
wastage
1a) Many power stations burn fuels such as
coal to produce heat for boiling water
b) The steam produced is used to turn the
turbines connected to the dynamo . As a
result , electricity is generated.
c) The energy change is as follows:Chemical
energy
( in the
Kinetic energy
(The turning of
turbines and
Electrical
energy

8. 2. Most vehicles used in our
modern society burn fuels such
as petrol and diesel to produce
energy to drive the engines.
3. The fuels used in power
stations and vehicles are non-
renewable.
4. Thus, we should use energy
efficiently to prevent wastage

9. Ways to use energy efficiently
USE ENERGY
EFFICIENTLY
Use energy-saving
electrical appliancesTurn off all
electrical
appliances
when they are
not in use
Iron the
clothes all at
one time
Car-pool
Close the door of a
refrigerator
immediately after
taking things from it

10. New ways to using chemical
reactions as sources of energy
Fuel cells are new type of electric cell which
are better than traditional cells and have
many advantages.
A hydrogen fuel cell uses hydrogen as fuel
to react with oxygen to produce energy. The
product is water, which will not pollute the
environment.

11. A metal fuel cell oxidises metal
atoms (such as aluminium) to produce
energy.
Fuel cells will continue to produce
electricity as long as the fuel is
supplied.
Metal fuel cells can be refuelled in 10
seconds.

12. Structured Questions
Sample Questions
(a)Why shouldn’t electric cells
be disposed in dustbins?
Answer: Electric cells contain
harmful corrosive chemicals.

13. (b) Suggest one way to dispose of
electric cells.
Answer: Electric cells should be
disposed of separately from other
household items. Parts of batteries
can be recycled.

14. c) State one advantage of using a
hydrogen fuel cell.
Answer: The by-product for this
cell is water which will not pollute
the environment.