Demo lesson
How to behave in science classroom
1. Don't run
2. Do everything carefully and follow instructions
3. Better slow than sorry!
4. Always use safety glasses and safety jackets!
5. Always ask if you don't know what you need to do
6. Clean your classware and table after experiments
7. HAVE FUN!
2. Do everything carefully and follow instructions
3. Better slow than sorry!
4. Always use safety glasses and safety jackets!
5. Always ask if you don't know what you need to do
6. Clean your classware and table after experiments
7. HAVE FUN!
Demo lesson
Experiment 1.
Explanation: When we put burning paper inside of the bottle, air inside heats up. When air is heated it can't no longer fit into the bottle and some of it escapes from the bottle.
When we put egg to top of the glass air cannot move in or out. Because some of the air left from the bottle, pressure inside is smaller than outside. Pressure from outside forces egg inside the bottle. How can you get egg out?
Mythbusters use air pressure in little bit bigger scale
Experiment 2.
Measure 40 ml of cornstarch to beaker. Measure 20 ml of water to another peaker. Mix these two together in big peaker and mix the solution with your hands.
Experiment 3.
Explanation: When we mix baking soda (base) and vinegar (acid), chemical reaction happends. In chemical reaction substances change from one to another. In this reaction carbon dioxide is formed. Carbon dioxide fills the balloon.
Lets try to tie the balloon, so we can compare it to air balloon.
NaHCO3 + CH3COOH= CO2 +H2O + Na+ CH3OO
Baking soda + vinegar = Carbon dioxide + water + Natrium + Acetate
Explanation: When we put burning paper inside of the bottle, air inside heats up. When air is heated it can't no longer fit into the bottle and some of it escapes from the bottle.
When we put egg to top of the glass air cannot move in or out. Because some of the air left from the bottle, pressure inside is smaller than outside. Pressure from outside forces egg inside the bottle. How can you get egg out?
Mythbusters use air pressure in little bit bigger scale
Experiment 2.
Measure 40 ml of cornstarch to beaker. Measure 20 ml of water to another peaker. Mix these two together in big peaker and mix the solution with your hands.
Experiment 3.
Explanation: When we mix baking soda (base) and vinegar (acid), chemical reaction happends. In chemical reaction substances change from one to another. In this reaction carbon dioxide is formed. Carbon dioxide fills the balloon.
Lets try to tie the balloon, so we can compare it to air balloon.
NaHCO3 + CH3COOH= CO2 +H2O + Na+ CH3OO
Baking soda + vinegar = Carbon dioxide + water + Natrium + Acetate