Problem Solving & Exam Technique Flashcards

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1
Q

How do you calculate a percentage change?

A

difference/original x 100%

2
Q

If the question asks, ‘what is the difference between’…?

A

you must mention BOTH e.g difference between diffusion and active transport - active transport requires energy is not enough MUST mention diffusion does not require energy.

3
Q

If the question asks, ‘calculate the average’…what do you do?

A

the total/the number of numbers you added together

4
Q

If the question asks, ‘calculate the average change’…what do you do?

A

total change/ time

5
Q

BUM?

A

Box the command word
Underline the key terms
Marks - how many is it worth? Have I done enough?

6
Q

If the question asks you to ‘describe’…what should you do?

A

As much detail as you can give.

The police have asked for a description of the person that stole your bike, you would not describe them as ‘man’.

7
Q

If the question asks you to ‘explain’…what should you do?

A

Tell me WHY

8
Q

What should you do if you have a graph with 2 lines?

A

Colour them in with 2 different colours

9
Q

How do you read a graph accurately?

A

Use a ruler

10
Q

What should you do if you see the word ‘reliable’ in a question?

A

Mention what exactly you are REPEATING and then calculate an average

11
Q

If the question asks for ‘percentage increase’…?

A

difference/original x 100%

12
Q

If the question asks for a ‘percentage decrease’…?

A

difference/original x 100%

13
Q

What is an independent variable?

A

The one thing that has been changed by the scientist in the experiment

14
Q

What is a dependent variable?

A

The thing that is measured to get the results in an experiment.

15
Q

Am*unt?

A

Don’t you swear at me! DO NOT use this term in your answer instead use volume, mass, size

16
Q

It?

A

NEVER use ‘it’ in your answer instead of the correct name. You say ‘it’, I say ‘what?’

17
Q

What is a ‘control’?

A

They prove that the variable being investigated is responsible for the result. Common examples include glass beads instead of living organisms and water in place of solutions.

18
Q

2 reasons why an experiment may be left for a period of time before measurements are taken?

A
1. allow living organisms to acclimatise to new conditions
2. allow apparatus to stabalise
3. allow osmosis/diffusion to happen
4. allow solutions to reach desired temperatures
19
Q

Why are percentage changes sometimes calculated in results tables?

A

If the starting figures were different it allows a comparison to be made.

20
Q

How would you predict a result from a line graph?

A

use a ruler to extend the existing line

21
Q

If a questions asks you to ‘Using data from the graph, describe’…what should you do? (not a trick question!)

A

Guess what, USE DATA FROM THE GRAPH!!! NUMBERS in your description

22
Q

What does DRAW a conclusion NOT mean?

A

Draw a picture

23
Q

Is a question asks you to ‘draw a conclusion’, what should you do?

A
1. Look at the AIM and answer that
2. Mention the independent and dependent variables in your answer (the dependent variable might not be what is stated in the table/graph - look at the AIM!!!)
24
Q

What should you do if the question asks you to ‘state variables that must be kept constant’?

A

Read the experiment carefully and decide which variables NOT mentioned already that would need to be kept the same to make it fair.

25
Q

3 possible examples of variables that must be kept the same?

A
```temperature
volumes
concentrations
mass
surface area
diameter of samples
thickness of samples
time
pH```
26
Q

What is never the correct answer for a variable that must be kept the same?

A

Am*unt - never use this word! It is swearing.

27
Q

Which variable always goes on the bottom of a graph?

A

The independent variable

28
Q

What should you do if the question asks you ‘how many times greater’ is X than Y?

A

Divide the big number by the small number

Divide X by Y

29
Q

How do you calculate the ‘average increase’?

A

total change/ time

30
Q

How do you calculate the average decrease?

A

total change/ time

31
Q

How do you calculate a simple whole number ratio?

A

Divide all of the numbers in the ratio by the same number until they cannot be divided any more.

32
Q

A