Chemical vs Physical Changes Movies
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Baking a cake
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Challenge Questions
Scenario One
While Dad was cooking breakfast the other day, Mum was baking my favourite chocolate cake. Mum measured out the correct amount of bi carb soda, and placed this in a measuring cup. At the same time, Dad was trying to measure out 1⁄4 cup of vinegar for the eggs he was poaching. He accidentally poured the vinegar into the measuring cup with Mum’s bi carb soda! What do you think happened?
While Dad was cooking breakfast the other day, Mum was baking my favourite chocolate cake. Mum measured out the correct amount of bi carb soda, and placed this in a measuring cup. At the same time, Dad was trying to measure out 1⁄4 cup of vinegar for the eggs he was poaching. He accidentally poured the vinegar into the measuring cup with Mum’s bi carb soda! What do you think happened?
Investigation 1
- 1. Use the funnel provided to put 1 tablespoon of bicarbonate soda into the balloon.
- 2. Take an empty plastic bottle and use the funnel to put half a cup of vinegar into the bottle using the measuring cup.
- 3. Carefully stretch the balloon opening over the bottle. Don’t let the bicarbonate soda spill into the vinegar until the balloon is firmly stretched over the bottle’s neck.
- Wait until all group members are watching, then lift the balloon to let the bicarbonate of soda fall into the bottle.
Scenario 2
Later in the morning, Mum wanted to ice her cake with chocolate. She grabbed a clean bowl and threw in some chocolate pieces. She placed the bowl over a pot with boiling water, switched off the hotplate, and left the kitchen. What on earth was going on?
Later in the morning, Mum wanted to ice her cake with chocolate. She grabbed a clean bowl and threw in some chocolate pieces. She placed the bowl over a pot with boiling water, switched off the hotplate, and left the kitchen. What on earth was going on?
Investigation 2
1. Break off 4 pieces of chocolate and place into the smaller beaker.
1. Break off 4 pieces of chocolate and place into the smaller beaker.
- 2. Boil the kettle. Be careful with the hot water and steam.
- 3. Half fill the larger beaker with hot water.
- 4. Place the smaller beaker into the larger one
- 5. Watch and wait.
- 6. After 4 minutes, remove the smaller beaker and carefully drain the water from the larger beaker.
Scenario 3
I noticed that Mum had left cream on the counter in a little glass jar overnight. I picked up the jar and swished it around. The cream covered the edges of the jar. As I was doing this, Mum walked in. “Don’t touch that – I’m going to make butter a bit later”. How do you think you could turn cream into butter?
I noticed that Mum had left cream on the counter in a little glass jar overnight. I picked up the jar and swished it around. The cream covered the edges of the jar. As I was doing this, Mum walked in. “Don’t touch that – I’m going to make butter a bit later”. How do you think you could turn cream into butter?
Investigation 3
- 1. Half fill a glass jar with the cream provided.
- 2. Add 1/8 teaspoon of salt.
- 3. Tighten the lid as firmly as you can.
- 4. Within your group, take turns shaking the jar. You will need to shake in one direction (ie. Up and down) for three full minutes.
- 5. Set the timer, and shake for one minute each.
- 6. Open the jar. You will find butter has formed.
Scenario 4
Towards the evening, I was lounging on the sofa. “Hey,” called my Dad. “Come and check this out.” I wandered over to the kitchen table. Dad had a plate of milk. He had dropped three different food colourings along one edge. As I stood beside him, Dad added a drop of detergent to the opposite edge. Wow! Do you know what happened?
Towards the evening, I was lounging on the sofa. “Hey,” called my Dad. “Come and check this out.” I wandered over to the kitchen table. Dad had a plate of milk. He had dropped three different food colourings along one edge. As I stood beside him, Dad added a drop of detergent to the opposite edge. Wow! Do you know what happened?
Investigation 3
- 1. Take a plastic plate and gently pour milk into it (approximately 1 cm deep).
- 2. Using the syringes provided, drop food 3ml of each food colouring into the milk. Drop these to one side of the plate (see diagram).
- 3. Use the measurements on each syringe to accurately drop 3ml.
- 4. On the opposite side of the plate, drop a tiny bit of detergent into the milk.
- 5. Watch and record what happens.