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Bella

Problem Solving terms

QuestionAnswer
What is a control experiment? A standard for comparison proving that XXX (independent variable) is responsible for the YYYY (result)
How do you increase Reliability Repeat the experiment and calculate an average
How do you increase Validity Ensure that variable are kept constant TTCMVP
Why do you repeat experiments To increase Reliability
Why do you calculate percentage change in mass To eliminate any variation in starting mass
Why do you calculate dry mass To eliminate any variation in water content
Why do you leave the experiment for 10 minutes before starting? To allow time for......1. diffusion to take place, 2. enzyme to breakdown the substrate, 3. inhibitor to have its effect, 4. solutions to reach correct temperature, 5. pressures to stabilise
Why do you calculate average results? To increase Reliability
How do you set up a control Use the exact same apparatus in the exact same way but replace XX with water/dead cells/different enzyme etc
How do you calculate percentage change? change/original x 100
If you earn £80 in 4 hours what is your average earning per hour? £20 per hour
Should you always include units with numbers? YES
How do you calculate a percentage (portion/total )X 100
How do you calculate a ratio Identify the numbers and write them in the correct order, then find a number that they both divide by until the numbers cannot be further simplified.
Calculate the DIFFERENCE between.... means subtract the numbers
By how many TIMES is X greater than Y? Divide the big number by the wee number
What is the "independent variable" in an experiment? It is the one you CHANGE and is plotted on the X axis
What is the "dependent variable" in an experiment? It is the one you MEASURE and is plotted on the Y axis
In a table of results, where do you find the "independent variable"? The first column of the table, and it is plotted on the X axis.
Created by: nscobie
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