Slides in this set
· You are going to carry out an investigation of a factor that affects
the movement of water or dissolved substances into and out of
· http://highered.mcgraw hill.
The Controlled Assessment is marked according to 5 strands. You are
given a score out of 64.
*** VERY IMPORTANT***
Remember to use your mark scheme and that you have to complete all
the requirements in the box gaining 1-2 marks before you are able to
gain 3 4 marks and so on. It is marked cumulatively.…read more
All investigations MUST have:
Prediction based on scientific ideas.
Independent variable what you are changing.
Dependent variable what you are measuring.
Control variables variables that need to be kept the same and why.
Safety hazards and precautions identified.
Equipment list why you are using each piece of equipment.
Method explaining your chosen method.
A range with a least 5 values why have you chosen that range.
Table straight lines, numbers to the same decimal points, units.
Graph labelled axis, even scale, correct line of best fit, range bars.
Evaluation problems with techniques + equipment, improvements.
Outliers correctly identified and discussed. Small/large range bars.
Review data comparison of own results with secondary data.
Review prediction review your confidence in your prediction.…read more
Strategy (Strand S)
You will be assessed for Quality of Written Communication. Good range of
punctuation and good use of scientific terms.
· Make a testable prediction that is supported by scientific knowledge.
· Consider all the control variables and explain how each variable could
change the experiment.
· Choose an independent and dependent variable. To gain the highest
marks make your prediction qualitative (use words such as `doubles,
`As the temperature of the hydrogen peroxide doubles, the rate of
reaction will double.'
List your equipment and explain why you are using that piece of
` I am using a measuring cylinder instead of a beaker because this will give
more accurate readings'.
· Describe your method and again explain why you are doing it one way as
opposed to another way.
" I am crushing up all the peas because this will allow the enzyme to
· Identify hazards and precautions. Make a table.
· Explain your ranges. Why might have you gone up in 0.5M concentration?
` I have chosen these ranges because in our preliminary we discovered...'…read more
Collecting data (Strand C)
Collect and correctly record data to a high quality. Are your results
what you expected? If your data is high quality, your repeats should
be close together.
Identify outliers and do not include in
the average.…read more