Lab #3 Oct 18th, Heating and cooling

Thank you Jennifer for putting together this lab!!!

Schedule - same as last time, let me know if you can't make it!
If we are running short, teachers can help out!

Please do not hesitate to come even if your name is not below 
- we love drop-ins!!!

email me - musicalmom@cebridge.net to get on the list.

Popcorn will be an entire class activity - make popcorn in front of class, then pass it out, they eat while watching popcorn movie - then split into 2 groups for remaining stations.
Meghan Goodman 8:00
Station 1. Jack _____
Station 2. Amanda______


Kelly Johnson 8:00
Station 1. Pilar_______
Station 2._Christina & Vivian __

Cheryl Kennedy 9:00
Station 1. _Morton (Ross)_ Melissa_____  
Station 2. _Mandy & Mom (Logan)________  


Emily Duerringer  9:00
Station 1. _Teresa (Sophia)_____ Amanda ___
Station 2._Jack (Morgan)_______
   
Teresa Welch - 10:00-11:00
(this is the big class, so we'll need lots of volunteers!! Last time each station was split into two groups, that seemed to work well if there are enough volunteers to do that again!)
Station 1. _Kelly & Steve ______
Station 1._Jennifer (Chloe)& Emily (Audrey)______

Station 2._Anneliese(Jason)
Station 2._Tina ___

**New this time*** - Teachers will do the intro before we get there, so we can jump straight into the stations - this will give all of us more time at the stations (less rushed) and the teachers will make sure the kids are learning what they are supposed to be learning ;)

Intro: By teachers
Heating and cooling can change matter.
Heat an ice cube - get water, water to steam etc.
Heat air - the air expands.
Have you ever cooked food with your mom in the kitchen?  What happens when we heat food up?  Pasta noodles get soft, etc.
Entire Class: Why does popcorn pop?

Supplies needed:

• Popcorn kernels
  Popcorn popper (2) (I have one to use)
  Vegetable oil
  Salt
  Napkins

Explanation:   

Each kernel of popcorn contains a small drop of water stored inside a circle of soft starch. Popcorn needs between 13.5-14% moisture to pop.  The soft starch is surrounded by the kernel's hard outer surface.

As the kernel heats up, the water begins to expand.  Around 212 degrees the water turns into steam and changes the starch inside each kernel into a super-hot gelatinous goop.  The kernel continues to heat to about 347 degrees.  The pressure inside the grain will reach 135 pounds per square inch before finally bursting the hull open.

As it explodes, steam inside the kernel is released.  The soft starch inside the popcorn becomes inflated and spills out, cooling immediately and forming into the odd shape we know and love.  A kernel will swell 40-50 times its original size!

Kids get to eat the popcorn after it pops!  

Talking points to be shared with the students:

• ·   When matter is heated it expands.
  ·   Heating the popcorn kernel causes the water inside to expand.
  ·  The water expands until it gets so big it explodes.

http://app.discoveryeducation.com/search?Ntt=popcorn&N=18340

(If a login and password is needed to view the short movie, the login is csmixon and password is calista.)

*Use the computers in the classrooms to show the above video

 
Lab stations
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Station #1: Making it rain

Supplies needed:

• Glass jar
  Plate
  Hot water
  Ice cubes

Activity: 

1. Fill the jar with about two inches of very hot water.  Cover the jar with the plate.   
2. Wait 2-3 minutes before the next step.   
3. Place ice cubes on the plate. 

 

Explanation:  The air inside the jar becomes warmer as it mixes with some of the hot water.  This forms water vapor, which is a gas, or air mixed with water molecules.  When the molecules warm, they rise in the jar, just like they do in the atmosphere.  When the plate cools from the ice cubes, the warm water vapor bumps into it and cools off.  When the water vapor cools, it turns back into tiny drops of water, called condensation.  This is what makes rain.

Talking points to be shared with the students:

·   When water is heated, water vapor is created (change from a liquid to a gas)

·   When the water vapor (gas) meets cold, tiny drops of water are formed.

·  Rain happens when warm air rises through the atmosphere and meets cold air.

http://www.weatherwizkids.com/experiments-make-rain.htm

 

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Station #2: Warm Air needs more room


Supplies needed:

• Balloon
• Empty glass bottle (with mouth small enough for balloon to fit over)
• Pan with hot water

Activity:

1. Stretch the balloon over the mouth of the bottle. 
2. Place the bottle in the warm water (not boiling). 
3. The balloon will begin to inflate as the air inside the balloon warms and expands. Molecules in the warm air begin to move faster and further apart from each other, making the balloon stretch. 
4. The amount of air has stayed the same, but it has expanded and now takes up more space.

Talking points to be shared with students:

· Warm air expands
· Molecules in the warm air move very fast and far apart from each other, taking up more space than when they were cold and stayed close together.

http://www.sciencekids.co.nz/experiments/heavyair.html