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