Section One Flashcards
what is a polymer?
a substance, normally plastic, made from monomers but can be natural.
what are the eight sections to writing a method?
risk assessment equipment and how it is used step by step method repeats... name the controlled variables (3) how the control variables are controlled dependant and independent variables explain how hazards can be reduced
remember to add subheadings
name three natural polymers:
banana skin
hair
grass
name 3 facts about polymers:
they are tough
made from monomers
different polymers have different properties
ethenes are used to make polymers
if you were comparing different widths of plastic strips, why would all the strips need to be cut from the same plastic bag?
to get valid results you need to only change on thing, so you would only change the width of the strips not the plastic bag itself. the plastic bag is one of the control variables, there fore it must be kept the same.
why may a source be good or bad?
good: very detailed, clear information, gives precise measurements, has all of the requirements In a method, has a diagram.
bad: not very detailed, not so clear, no precise measurements, doesn’t include all requirements, has no diagram.
what are three things you need to do in section one of the ISA?
state the variables that will need to be managed.
research and write out a ‘rough’ method.
write a detailed plan of your chosen method.
identify possible hazards and write down how the risks may be minimised.
draw a blank table suitable for the method you have planned.
what does the ideal method include?
- list the equipment needed and state what each piece of equipment is used for.
- step by step method of what to do;
- state the dependant, independent variables, including a range of the independent variable and those that need to be controlled; higher level answers shock include an explanation of WHY these variables need to be controlled - include ‘because …’
- state any safety precautions, what the hazard is and how the hazard will be controlled.
you will be asked to explain the advantages of comparing results with other students who carried out the same practical.
state the ‘obvious’ the. uses the correct term to describe when a practical is repeated using the same method and the same results are gained.
because it would be easier to spot an anomaly.
to see if you are getting similar results to other people to check your experiment is going well.
to see if they are reproducible.
to see if the trend is the same.
- a measurement is reproducible if the investigation is repeated by another person, or by using different experiments or techniques, and the same results or trend are obtained.
what must a good table look like?
- use a pencil or ruler
- the table must be COMPLETELY boxed in
- all columns must have a heading WITH units
- the independent variable MUST be the first column on the LEFT
- the dependent variable must be on the RIGHT
what side of the table does each variable go?
independent on the left
dependent on the right
what is the context?
how to link the experiment with everyday life
give examples of the context:
to improve how we make polymer
to make plastic bags more economical
to help make shopping bags easier to carry
