Problem Solving terms
Help!
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| What is a control experiment? | A standard for comparison proving that XXX (independent variable) is responsible for the YYYY (result)
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| How do you increase Reliability | Repeat the experiment and calculate an average
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| How do you increase Validity | Ensure that variable are kept constant TTCMVP
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| Why do you repeat experiments | To increase Reliability
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| Why do you calculate percentage change in mass | To eliminate any variation in starting mass
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| Why do you calculate dry mass | To eliminate any variation in water content
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| 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
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| Why do you calculate average results? | To increase Reliability
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| 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
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| How do you calculate percentage change? | change/original x 100
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| If you earn £80 in 4 hours what is your average earning per hour? | £20 per hour
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| Should you always include units with numbers? | YES
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| How do you calculate a percentage | (portion/total )X 100
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| 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.
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| Calculate the DIFFERENCE between.... | means subtract the numbers
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| By how many TIMES is X greater than Y? | Divide the big number by the wee number
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| What is the "independent variable" in an experiment? | It is the one you CHANGE and is plotted on the X axis
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| What is the "dependent variable" in an experiment? | It is the one you MEASURE and is plotted on the Y axis
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| 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.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
nscobie
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