Required practical review
Osmosis - Investigate the effect of a range of concentrations of salt or sugar solutions on the mass of plant tissue.
In this investigation, what type of variable is the concentration of salt or sugar solution? *
1 point
In this investigation, the temperature of the solution would be an example of what type of variable? *
1 point
Using a mass-balance with a resolution of 2 d.p will ensure the results are... *
1 point
Enzymes - Investigate the effect of pH on the rate of reaction of amylase enzyme.
In this investigation, what type of variable would the rate of reaction be? *
1 point
Controlling the temperature of the reaction would help ensure the results are... *
1 point
If two different groups repeated the experiment but using different equipment to each other, and obtained the same results, the results are... *
1 point
Photosynthesis - Investigate the effect of light intensity on the rate of photosynthesis using an aquatic organism such as pondweed.
This investigation is repeated three times by the same group using the same equipment and the rate of photosynthesis is compared for a specific light intensity. If the repeats are close to the mean value, the results are... (Tick all that apply)
1 point
Force and extension - Investigate the relationship between force and extension for a spring.
In this investigation, masses are added to the spring to increase the force. The student conducting the experiment has not accounted for the force caused by the mass holder. This means there will be a.. *
1 point
In order to obtain more precise readings, the following type of error needs to be low... *
1 point
A ruler is used to measure the extension of the spring, but is positioned incorrectly. Which of the following statements is true.
1 point
Rates of reaction - Investigate how changes in concentration affect the rates of reactions by a method involving measuring the volume of a gas produced and a method involving a change in colour or turbidity.
In this investigation, the rate of reaction is higher if the volume of gas produced is higher *
1 point
In this experiment a student starts the timer before the reaction actually starts. This will cause... *
1 point
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