[sci] Summer Workshop Worksheet

23 – 25 June 04

Summer Science Workshops Pouring Water Materials and Apparatus Large plastic bottle

1

Stop Watch

1

Procedures 1. Fill the large plastic bottle with water fully. 2. Try to think of the fastest way to pour the water out. 3. Each student pours the water out and time is taken by the stop watch.

Questions 1. Describe your method. _____________________________________________________________________________ _____________________________________________________________________________ 2. What is the best way to pour the water within the shortest time? Explain briefly. _____________________________________________________________________________ _____________________________________________________________________________

Inflate a Balloon using Vinegar & Baking Soda Materials and Apparatus Conical Flask 1 Balloon Funnel 1 Spatula Vinegar Baking Soda / Calcium Carbonate

1 1

Procedures 1. Pour vinegar into the flask about half-full. 2. Using the funnel and spatula to fill the uninflated balloon with baking soda. 3. Carefully stretch the neck of the balloon over the neck of the flask. Make sure that no baking soda falls in. 4. Make the baking soda falls into the vinegar by upending the balloon.

Questions 1. What are your observations when the baking soda is added to the conical flask? _____________________________________________________________________________ _____________________________________________________________________________ 2. Explain your observations _____________________________________________________________________________ -1-

23 – 25 June 04

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Grow Crystal from a Saturated Solution Materials and Apparatus Bunsen burner 1 Copper (II) sulphate powder 1 Copper (II) sulphate crystal 1 Cardboard 1

Beaker Spatula Thread Sellotape

1 1

Procedures 1. Fill the beaker of about 50 cm3 of water. 2. Add a spatula of copper (II) sulphate to the water and stir it with a glass rod until all the copper (II) sulphate dissolves in water. Add another spatula of copper (II) sulphate to the water and stir it again. The step is repeated until the copper (II) sulphate cannot dissolve further. 3. Light the Bunsen burner. Heat the beaker of water for about 3 minutes. 4. Turn off the Bunsen burner and continue to add copper (II) sulphate to the hot water and stir until no more can be dissolved. 5. Take a large and well-shaped crystal. Using a thread and a piece of cardboard to hang it and immerse it into the saturated solution.

Questions 1. What is the colour of the saturated copper (II) sulphate solution? _____________________________________________________________________________ 2. Copper (II) sulphate has a solubility of 20 g in 100cm 3 of water at 00C. At 200C, it has a solubility of 32 g in 100cm3 of water. If 50cm3 of saturated copper (II) sulphate solution at 200C is cooled to 00C, what is the weight of the copper (II) sulphate crystals formed? _____________________________________________________________________________ _____________________________________________________________________________

The Amazing Bottom Checker Materials and Apparatus A set of checkers Procedures 1. Build a stack of checkers. 2. Give a hard and quick strike onto the bottom checker. 3. Try to give a hard and quick strike onto the middle checker this time.

Questions 1. What is your observation after you have given a hard and quick strike to the stack of the checkers? _____________________________________________________________________________ -2-

23 – 25 June 04

2. Which way is easier? Strike onto the bottom or the middle? _____________________________________________________________________________ 3. What is the theory behind? _____________________________________________________________________________ _____________________________________________________________________________

The Turtle and the Hare Materials and Apparatus Plastic Bottles

2

Long wooden plank

2

Procedures 1. Fill one of the plastic bottles half full of water. 2. Leave the second bottle empty. 3. Make the wooden plank as a ramp. 4. Place the two bottles side by side at the top of a ramp. 5. Watch carefully as they roll down the slope.

Questions 1. Before the start of the experiment, guess which bottle will go the furthest before stopping. _____________________________________________________________________________ 2. What is the result in the end? _____________________________________________________________________________ _____________________________________________________________________________ 3. Explain your observation. _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________

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23 – 25 June 04

Deep-sea Diver Materials and Apparatus Plastic Bottle with lid Plastic Pen Cap Large Beaker

1 1 1

Paper Clips Plasticine

8

Procedures 1. Attach a lump of plasticine to the end of a plastic pen cap. 2. Adjust the amount of plasticine until the top just floats above the water surface in the beaker. 3. Use paper clips to make a hook and weights. 4. Attach the hook to the plasticine 5. Put weights into the full bottle of water. 6. Put the ‘diver’ into the bottle and screw on the lid. 7. Squeeze the bottle with both hands and observe.

Questions 1. What happens to the diver after you have squeezed the bottle? _____________________________________________________________________________ _____________________________________________________________________________ 2. What happens to the diver after you have released the bottle? _____________________________________________________________________________ _____________________________________________________________________________ 3. Explain what happens when you squeeze or release the bottle. _____________________________________________________________________________ _____________________________________________________________________________ Can you use the ‘diver’ to hook the clips?

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23 – 25 June 04

Summer Science Workshop Red Cabbage Litmus Paper Materials and Apparatus Red Cabbage 紅椰菜 / 波菜 / rose petal Large Beaker Scissors

Filter Paper Forceps

1 1

1 1

Procedures 1. Cut the red cabbage / 波菜 / rose petal into small pieces. 2. Place the sliced cabbage into the beaker. 3. Pour water to half full of the beaker. 4. Light the Bunsen burner and boil for 15 minutes. 5. Cut the filter paper into several strips. 6. Let the red cabbage / 波菜 / rose petal juice cool. 6. Soak the filter paper strips in the cabbage juice for 1 minute. 7. Let the soaked filter paper strips dry.

Test for Acid and Base 1. Record your results in the following tables. Liquids / Solutions Colour of the Litmus Paper

Acidity and Alkalinity Most acidic

Less Acidic / Most Alkaline

Liquids / Solutions

Colour of the Litmus Paper Made of ____________

Acidity and Alkalinity Most acidic

Less Acidic / Most Alkaline

2. Any differences among different types of litmus paper? If so, state your observation. _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________

The ‘come-back’ can -5-

23 – 25 June 04

Materials and Apparatus Plastic Can Short Pencil Thread

1 2 1 roll

Rubber Band Bolt Cap Scissors

1 2 1

Procedures 1. Collect a plastic can. 2. Drill a hole in the middle of the lid and the bottom. (Ask an adult to help you with this.) 3. Pass a piece of rubber band through the hole in the bottom of the can and tie a pencil at the bottom as shown. 4. Using a piece of thread/sellotape, tie the bolt caps in the middle of the rubber band. 5. Pass the other end of the rubber band through the hole in the lid of the can and tie another pencil on the lid as shown. 6. Close the lid and roll the can on a table or the floor.

Questions 1. What happens after you roll the can? _____________________________________________________________________________ _____________________________________________________________________________ 2. What happens to the rubber band when the can is rolled? _____________________________________________________________________________ _____________________________________________________________________________ 3. Write down the energy change in this activity. _____________________________________________________________________________ _____________________________________________________________________________

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