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[WJEC] GCSE Science Unit 3 Cheat Sheet by

Essential terminology and question-specific guides on the WJEC GCSE Triple Award Science Unit 3 Practical examination.



Section - A

Predic­tio­n/H­ypo­thesis - The affect of the indepe­ndent variable on the dependent. Your answer does not need to be scient­ifi­cally correct, however, it must link the indepe­ndent and dependent variables.
Risk assessment - Your control measure must relate to your risk. Consult the termin­ology table for defini­tions of hazards, risks, and control measures.
Table - Indepe­ndent variable in the 1st column (minimum value to maximum value). The resolution (decimal places) must remain constant in your table. Means are usually not in the instru­ctions, but they are required if you are doing repeats. The mean should be in a multi-­column with the dependent variable.

Section - B

Graphs - Follow LUSH (labels, units, scale, heading). Labels and units must match your table. Scale can be any variation of 1s, 2s, and 5s (i.e. 0.1, 20, 5000). A main heading is not required. The graph must fill the most amount of the graph paper as possible, and, for this reason, the origin does not have to be (0,0). The line of best fit does not have to go through the origin, even if it's supposed to, and anomalies should be ignored when drawing the LOBF. You should aim for an equal number of points above and below the best fit line, and the line must be neat to be marked.
Experi­mental Inaccu­racies - You may need to theorise any potential limita­tions with the experiment you conduct, and come up with realistic solutions to those problems. To do this, knowledge of the theory regarding your experiment is essential, and you must also be aware of things such as repeat­ability and reprod­uci­bility which are used to validate conclu­sions. A common example of experi­mental inaccu­racies is increasing sample size. This can be done by experi­menting on different ages, genders, and ethnic­ities. Clues in the question will provide you with hints as to if the subjects in the experiment represent the whole popula­tion.

Rates of Graphs



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