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Chemistry
Paper 2
Life Cycle Assessments
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Annabel
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Cards (25)
What is the focus of today's video?
Life cycle assessments
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What do life cycle assessments analyze?
The
different
stages
in
a
product's
life
cycle
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What will be compared as an example in the video?
Plastic bags
and
paper bags
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What are the four main stages of a life cycle assessment?
Extraction
,
manufacturing
,
usage
,
disposal
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What is important to focus on in each stage of a life cycle assessment?
Understanding
them
,
not
memorizing
facts
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How does extracting resources from nature impact the environment?
It
often
directly
damages
the
local
environment
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What is an example of direct environmental damage during extraction?
Cutting
down
forests
for
wood
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What can processing materials indirectly damage the environment?
Energy
requirements
and
pollutant
release
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What are three main problems associated with manufacturing and packaging?
Energy use
,
pollution release
,
waste
production
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What can sometimes be done with waste products from manufacturing?
Used
as
raw materials
for
something
else
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What two factors should be considered when using a product?
Lifetime
damage
and
usage
duration
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How does the usage of a durable bag compare to a single-use bag?
A
durable
bag
is
used
thousands
of
times
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What happens if a product is disposed of in landfill?
It
takes
up
space
and
may
leak
chemicals
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What are the consequences of burning waste products?
Release
of
pollutants
into
the
atmosphere
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What is the raw material for plastic bags?
Crude oil
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How are paper bags made?
From
wood
,
reducing
animal habitats
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What process is required to manufacture plastic bags?
Cracking
hydrocarbons
and
polymerization
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What is required to manufacture paper bags?
Pulping
timber
,
which
uses
energy
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How do plastic bags compare to paper bags in terms of reuse?
Plastic
bags
can
be
reused
multiple
times
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What is a significant environmental issue with plastic bags?
They
are
not
biodegradable
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Why are paper bags considered better for disposal?
They
are
biodegradable
and
non-toxic
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What is a limitation of life cycle assessments?
Complexity
makes
quantifying
steps
difficult
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Why can life cycle assessments be manipulated?
They
are
complex
and
hard
to
notice
changes
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What is a challenge in comparing environmental impacts?
Assessing
harm
of
different
pollutants
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What should viewers do if they enjoyed the video?
Let
us
know
in
the
comments
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