6.1.how does technology enhance and or limit scientific investigations?
6.1.1. Practical Investigations
1. Temperature on reaction rate
effect of different temperatures on aspirin reaction rate
technology
I.V.
D.V.
temperature probe
stopwatch
relationship
2. Temperature on volume of gas
4. Speed on distance travelled
3. Pressure on volume of gas
as temperature was increased, the rate of reaction increased
took a shorter amount of time for aspirin tablet to dissolve
Charles law
technology
I.V and D.V.
computer simulation
relationship
linear
directly proportional
as temperature increases volume increases
technology
computer simulation
Boyle's law
based on mathematical modelling
relationship
as pressure was increased, volume decreased
exponential: non linear
inversely proportional
technology
I.V. and D.V.
ruler
I.V.
Stopwatch
relationship
as speed increased, the distance also increased
speed = distance divided by time
directly proportional
6.1.3. Accuracy and Error
systematic error
random error
will shift measurements from its true value by the same amount each time
e.g. Calibration error
shift measurement from its true value
e.g. reaction time
degree/limitation of accuracy
. or = 0.5 unit
6.1.4 compare analogue and digital technology
digital technology
e.g. digital scales
possible calibration error
to sensitive
more expensive
higher degree of accuracy (decimal place)
e.g. video recording (high speed camera)
decrease random error
analogue
may introduce parallax error
usually cheaper
lower degree of accuracy
thermometer, ruler, measuring cylinder
both systematic and random error
by random amount
6.1.5 Assessing Safety
WHS
faults in technology
chemical
first aid
MSDS
material safety data sheet
storage
properties