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- 1. Multiple Choice
What is an INDEPENDANT variable?
The variable that is changed by the investigator
A variable that changes and is measured
A variable that should be kept constant so as to not affect the result of the dependant variable
- 2. Multiple Choice
What is a DEPENDANT variable?
The variable that is changed by the investigator
A variable that changes and is measured
A variable that should be kept constant so as to not affect the result of the dependant variable
- 3. Multiple Choice
What is a CONTROL variable?
The variable that is changed by the investigator
A variable that changes and is measured
A variable that should be kept constant so as to not affect the result of the dependant variable
- 4. Multiple Choice
How can you make an experiment more RELIABLE?
Do it 3 times and then take an average.
Use the same type of sample.
Exclude anomalies from data.
Use appropriate apparatus
- 5. Multiple Choice
How can you make an experiment VALID?
Do it 3 times and then take an average.
Use the same type of sample.
Use the same volume of solution.
Use appropriate apparatus
- 6. Multiple Choice
How can you make an experiment more ACCURATE?
Do it 3 times and then take an average.
Use the same type of sample.
Use the same volume of solution.
Use appropriate apparatus
- 7. Multiple Choice
How many decimal places should you answer with?
1 decimal place even if the rest of the table is a whole number
A whole number even if the rest of the table is to 1 decimal number.
If the rest of the table is to 1 decimal place then you should answer with 1 decimal place even if your answer is a whole number.
If the rest of the table is a whole number, then you should answer with 1 decimal place even if your answer is a whole number.
- 8. Multiple Choice
What is the test for Starch?
Add a few drops of Iodine Solution, gently shake, it should turn from brown/orange to blue/black
Add a few drops of Biuret Reagent, gently shake, it should turn from blue to mauve/purple
Add 2cm³ Benedict's Reagent, heat/boil, it should turn from blue to green to yellow to orange to red
The emulsion test: Add 2cm³ of ethanol to the unknown solution, gently shake, pour into equal volume of distilled water. If present a milky-white emulsion is formed.
- 9. Multiple Choice
What is the test for Reducing Sugars?
Add a few drops of Iodine Solution, gently shake, it should turn from brown/orange to blue/black
Add a few drops of Biuret Reagent, gently shake, it should turn from blue to mauve/purple
Add 2cm³ Benedict's Reagent, heat/boil, it should turn from blue to green to yellow to orange to red
The emulsion test: Add 2cm³ of ethanol to the unknown solution, gently shake, pour into equal volume of distilled water. If present a milky-white emulsion is formed.
- 10. Multiple Choice
What is the test for Fat (Lipids)?
Add a few drops of Iodine Solution, gently shake, it should turn from brown/orange to blue/black
Add a few drops of Biuret Reagent, gently shake, it should turn from blue to mauve/purple
Add 2cm³ Benedict's Reagent, heat/boil, it should turn from blue to green to yellow to orange to red
The emulsion test: Add 2cm³ of ethanol to the unknown solution, gently shake, pour into equal volume of distilled water. If present a milky-white emulsion is formed.
- 11. Match
Match the following tests
What is the test for Oxygen?
A glowing splint is held above a glass tube. When the stopcock is opened, the gas rushes out, and ignites the glowing splint
What is the test for Carbon Dioxide?
Bubble the test gas through limewater (calcium hydroxide solution). It turns limewater cloudy white.
What is the test for water?
Cobalt chloride paper. From blue to pink
- 12. Multiple Choice
What is the test for Vitamin C?
Add drops of DCPIP to the solution slowly.
Add methylene blue solution.
Add Iodine solution.
Add ascorbic acids solution.
- 13. Multiple Choice
Magnification Equation
Magnification = Measured / Actual
Magnification = Actual / Measured
- 14. Multiple Choice
In an experiment to look at the effect of temperature on the number of bubbles of oxygen produced by a plant, what is the independent variable?
number of bubbles of oxygen produced
temperature
type of plant
- 15. Multiple Choice
In an experiment to look at the effect of temperature on the number of bubbles of oxygen produced by a plant, what is the dependent variable?
number of bubbles of oxygen produced
temperature
type of plant
- 16. Multiple Choice
In an experiment to look at the effect of temperature on the number of bubbles of oxygen produced by a plant, which of the following is not a suitable control variable:
light intensity
volume of water
type of plant
size of plant
- 17. Multiple Choice
If you move a lamp closer to a plant, what two variables would increase?
light intensity
temperature
size of plant
- 18. Multiple Choice
If you use a potometer, you are measuring the rate of which process?
transpiration
photosynthesis
osmosis
- 19. Multiple Choice
What process occurs in a plants cells to create oxygen bubbles?
Oxidation
Transpiration
Photosynthesis
Osmosis
- 20. Reorder
Reorder the following steps on how should you design an experiment?
Find the variable which is to be changed (from the question) and mention how you are going to change it
List all variables that you have to keep constant throughout the experiment
Mention how long your experiment will last
Say how you will measure experiments' results
Say 'repeat experiment to get more reliable results and minimise error
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