1. Study the diagram carefully. When block A is lowered into the displacement can, 50 cubic cm of water flows from the can into the measuring cylinder.
When block B is lowered into the can, with block A still in the can, the level of water in the measuring cylinder increased to 120 cubic cm.
(a) What can be concluded about the volume of block B compared to block A?
(b) State one property of a solid that can be shown from the experiment.
(c) Block A was removed from the displacement can and heated evenly over a flame for five minutes.
The volume of block A after heating was 52 cubic cm. Explain why.
2. The capacity of jar A and B is 200 cubic cm each. Each jar contains 200 cubic cm of air.
Jenny conducted an experiment and connected a pump to each jar as shown in the diagram.
She pumped another 100 cubic cm of air into jar A. Both jars were then placed on a mass balance.
(a) State one observation she would make when 100 cubic cm of air is pumped into jar A.
(b) What is the volume of the air in jar A in the end?
(c) State two properties of air that are shown in the experiment above.
3. Faith observed the growth of a seed as shown. She then recorded the mass of the seed from stage W to stage Z.
(a) From the results, the mass of the growing seed increased from stage W to stage Z. Explain why.
(b) Look at stage Z. Name the part labeled V.
(c) Faith removed the part labeled V. Will the young plant continue to grow? Explain your answer.
4. Sheila puts a balsam plant each into Flask X and Flask Y.
She removed only the roots of the balsam plant in Flask X.
Both flasks were then left in the open at the same location and the volume of water in each flask was measured and recorded over five days.
The graphs show the changes in the volume of water in both flasks over a period of five days.
(a) Study the two graphs shown. Which graph best represents the change in volume of water in Flask X and Flask Y over a period of five days?
Label X and Y in the two boxes.
(b) Give a reason for your answer in (a).
5. Then Sheila set up another experiment in a dark room.
She counted the number of gas bubbles released by a water plant per minute when the beaker was placed at different distances away from the lamp.
Her results were in a table.
(a) Predict the likely number of gas bubbles released per minute when the distance between the beaker and lamp is 20cm.
(b) What is the relationship between the distance the beaker and the lamp and the number of gas bubbles released per minute?