Spaces in Matter: Demonstration

Pop Can, Chocolate Bar and Baking Soda/Candle: Demonstration

Name: ______

Date: ______

Purpose: To view and experience chemical and physical changes.

Pop Can

Hypothesis: (What do you think will happen to a pop can filled halfway with boiling water when it is placed upside down in a pan of cold water?) ______

Materials:

Procedure:

1. Pull your chair around the table so that you can see. Ensure that you are at least 2 meters away.

2.Your teacher will pour water into an empty pop can (about halfway).

3.The pop can will be held over the burner until the water boils.

4.As you are waiting, discuss what you think is going to happen.

5.Once the water is boiling, the teacher will quickly turn it upside down and place it into the pan of cold water (be careful, water may splatter).

Observations:

Describe what happened and draw a picture.

______

______

______

______

______

______

______

______

______

______

______

Question:

Was this a physical change or a chemical change? How do you know?

______

______

Chocolate Bar

Hypothesis: (What will happen when chocolate is heated?) ______
Materials:

Procedure:

1. Pull your chair around the table so that you can see. Ensure that you are at least 2 meters away.

2.Your teacher will heat the Hershey bar in the saucepan.

3.Once it is melted you may be able to taste the chocolate.

4.Continue heating the chocolate.

5.Once is it burnt, you may be able to taste the chocolate.

Observation: (write down everything you observe with each of your five senses)

______

______

Questions:

Was the melted chocolate a physical change or a chemical change? How do you know?

______

Was the burnt chocolate a physical or a chemical change? How do you know?

______

What other substances could we do this same demonstration with?

______

Baking Soda, Vinegar and a Candle

Hypothesis: (What will happen when we try to light a candle after the reaction between vinegar and baking soda?) ______
Materials:

Procedure:

1. Pull your chair around the table so that you can see. Ensure that you are at least 2 meters away.

2.Place the candle inside a bowl. Sprinkle five tablespoons of baking soda around the candle.

3. Next light the candle and spoon vinegar down the side of the bowl. The mixture will bubble. Stop spooning in vinegar once the mixture reaches halfway up the candle. The candle will go out.

4. Try to relight it – observes what happens

5. Wait 2 minutes and try to relight – what happens now?

.

Observations:

Describe what happened and draw a picture.

______

______

______

______

______

______

______

______

Describe what happens when you try to relight the candle:

______

Describe what occurs after 2 minutes when you try to relight:

______

Question:

Was this a physical change or a chemical change? How do you know?

______

______

Why would the candle not relight?

______

______