2661019
Emulsions
- Research
- Source 1
- Specific Volumes
- Clear Instructions
- Precise
measurements
- Specific Volumes
- Source 2
- No dependant variable
- No structured instructions
- Not precise
- No dependant variable
- Source 1
- Other methods
- Using egg yolk
- Really sticky and is time consuming
( when it comes to beakers at least)
- Really sticky and is time consuming
( when it comes to beakers at least)
- Using egg yolk
- Variables
- Independent Variable
- Amount of emulsifier
- Range: 0-5ml
- Interval: 1ml
- Range: 0-5ml
- Amount of emulsifier
- Dependant
- Time taken to separate
- Time taken to separate
- Controlled Variables
- Oil (10ml)
- Water (10ml)
- Shakes
- Food colouring ( 2 drops)
- Room Temperature
- Oil (10ml)
- Independent Variable
- Preliminary Testing
- Volume of water and oil
- 10-20 ml
- Reasons to choose
range: To see how
long it takes
- Final Value: 10 ml
- Reasons for choice: Short
enough to wait without
wasting time. Long enough
to record for more than
one second
- Reasons for choice: Short
enough to wait without
wasting time. Long enough
to record for more than
one second
- Volume of water and oil
- Hypothesis
- The time taken for a
mixture of oil, water and
emulsifier to separate
depends on the volume of
emulsifier in the mixture
- The bigger the volume,
the shorter the time it
takes for the oil and the
water to separate
- The bigger the volume,
the shorter the time it
takes for the oil and the
water to separate
- The time taken for a
mixture of oil, water and
emulsifier to separate
depends on the volume of
emulsifier in the mixture
- Risk
Assessment
- Apparatus could break due to
rough handling or it falling on
the floor
- They could cause
injuries and are
expensive to replace
- Be gentle with them and don't put
them at the edge of the table
- Be gentle with them and don't put
them at the edge of the table
- They could cause
injuries and are
expensive to replace
- Ill-fitting bungs
could cause the
testube to shatter
- Glass could cut skin and cause
serious injuries
- Choose the correct size bung
- Choose the correct size bung
- Glass could cut skin and cause
serious injuries
- Lecithin could be accidently ingested
- It could make the person very ill
- Keep hands away from mouth and
wash hands after use
- Keep hands away from mouth and
wash hands after use
- It could make the person very ill
- All the substances are slippery
- Somebody could slip and hurt themselves
- Ensure the lids are secured on
the bottles and clean u
spillages immediately
- Ensure the lids are secured on
the bottles and clean u
spillages immediately
- Somebody could slip and hurt themselves
- Apparatus could break due to
rough handling or it falling on
the floor
- Equipment
- 10 ml of oil
- Stopwatch
- Thermometer
- 10ml of water
- 5 bungs
- 4 testubes
- marker ( to
mark out 1 cm
line on each of
the testubes
- marker ( to
mark out 1 cm
line on each of
the testubes
- testube rack
- Food Colouring
- 4 pipettes
- medium strength lecithin
- 10 ml of oil
- Fair Testing (Validity)
- Shakes
- Count and have another
person keep track
- Count and have another
person keep track
- Temperature
- Use a thermometer to
test the substances to
make sure they are
within average room
temperature
- Use a thermometer to
test the substances to
make sure they are
within average room
temperature
- Oil+ Water+ Food Colouring
- Use a pipette graduated in
ml to ensure the correct
amount goes in
- Use the 1cm line to know
precisely when to stop the
stopwatch to acquire the
dependant variable
- Use a pipette graduated in
ml to ensure the correct
amount goes in
- Shakes
- Random questions answered
- DV will be measured using a
stopwatch to a resolution of 0.001 of a
second
- 3 repeats. Enough to eliminate anomalies but not
as much to make too many anomalies
- The testubes will be used to contain
all the liquids . The pipettes will be
used as a measuring device. The
stopwatch is to measure the
dependant variable
- DV will be measured using a
stopwatch to a resolution of 0.001 of a
second
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