1. Dry Ice Lab
8th Grade Science

2. DO NOW MONDAY OCTOBER 31st
Answer the following:
What is dry ice made of?
What is the phase change that happens as dry ice changes from a SOLID TO A GAS as it warms to room temperature?
Would this change in state be a physical or a chemical change?
DO NOW MONDAY OCTOBER 31st

3. Number your paper from 1-3.
Quick Learning Check

4. Matter can be described by physical and chemical properties
Matter can be described by physical and chemical properties. Which of the following contains ONLY physical properties?
Iron rusts in air. Iron is a dark metallic color. Iron can be magnetized.
Rubies are red. Rubies are hard gemstones. Rubies grow in a hexagonal shape≥
Silver corrodes. Silver is shiny. Silver is a metal.
Calcium chloride reacts with sodium bromide. Calcium chloride is a liquid.

5. 2. Which of the following are chemical properties of matter?
Changes in the state of matter.
Changes in shape and color.
Changes that changes the identity of a substance.
Changes that do NOT change the identity of a substance.

6. 3. Which of the following signs does NOT indicate that a chemical change has happened?
Changes in the state of matter
Changes in color or odor
Bubbling or fizzing
Producing heat or getting cold

7. PLAN DO Compare and contrast physical and chemical changes.
Observe physical and chemical changes of matter.
Measure temperature changes associated with these changes.

8. On your paper, write your observations of Fred before and during the demonstration.
Was the demonstration you observed a physical or a chemical change? EXPLAIN how you know.
Fred the Angry Pumpkin

9. CAUTION!!!!!
Dry ice should be handled with EXTREME CAUTION!!!
Always wear gloves!!!
Dry Ice Lab

10. Teacher Demo: Candle Write on your paper:
Predict what will happen when I place a candle in the bottom of 1 Liter beaker with a piece of dry ice beside it.
Teacher Demo: Candle

11. Dry ice is solid (every cold) carbon dioxide (CO2).
It is more dense than air.
When the carbon dioxide warms and turns to a gas, it stays at the bottom of the beaker with the flame.
This “crowds out” the oxygen so that the flame dies because there is no oxygen to keep it burning.
Fire extinguishers use CO2.
Teacher Demo Answer

12. Lab Today: 2 Activities Activity 1 Activity 2
Fill a 250 mL beaker ½ full with warm water.
Record its initial temp.
Wearing gloves, place 1 piece of dry ice into the beaker.
Record the temp. every minute for 5 minutes.
Graph your data. (Time – x axis and Temp-y axis) Don’t forget a good graph TALKS!!
Fill a 250 mL beaker with warm water and add some liquid soap.
Wearing gloves, add dry ice to the beaker.
Observe and record how the bubbles look.
Add 3 drops of food coloring.
Record the color of the water and the color of the CO2.
Lab Today: 2 Activities

13. Outside Demo: Plastic Bottle
Write on your paper:
Predict what you think will happen when we put dry ice into a closed plastic bottle with a small amount of water in it.
Let’s go see!!!
Outside Demo: Plastic Bottle

14. Use the time remaining in class to complete the Conclusion Questions.
If you do not finish them, then they are homework.
Conclusions