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Background Materials Procedure

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Presentation on theme: "Background Materials Procedure"— Presentation transcript:

1 Background Materials Procedure
Ice Cream Lab Background Materials Procedure

2 Matter What is matter? Anything that has mass and takes up space
What are the three main states (or phases) of matter? Solid, Liquid, and Gas

3 How much energy is present in each state of matter
How much energy is present in each state of matter? (relatively speaking) Less Energy Solid Solids - particles are vibrating in place; not much movement Liquids - particles move around; sliding past each other Gases - particles are moving all over the place; moving in straight lines and bouncing off things Gas More Energy

4 Physical States of Water
WHAT WE CALL IT CHEMICAL COMPOSITION SOLID ICE H2O LIQUID WATER GAS VAPOR So, a change of state is a physical change not a chemical change.

5 Phases of Matter & Relative Energy
We want answers. We want the truth. Gas WAIT - If the energy is changing why isn’t the temperature? L & G 100 Temperature (Deg. C) Liquid S & L Solid Energy Taken Away or Added

6 BECAUSE: The energy is being absorbed or released by the matter as it changes states! No, not from Pennsylvania to West Virginia, from Solids to Liquids and Liquids to Gases and vice versa.

7 So, what does this have to do with ice cream?
When we make ice cream we start with a milk and sugar mix – A LIQUID And we end up with a frozen delight – A SOLID We use ice and salt to make that happen and the ice has to melt.

8 How does the process work?
Water has colligative properties. When an impurity (such as salt) is added to water, the boiling point is elevated and the freezing point is depressed. That is why your parents put salt on an icy sidewalk. The ice will melt because salty ice has a lower freezing point than just ice and hopefully it is not cold enough to keep salty ice frozen.

9 Back to ICE CREAM We have two different phase changes occurring.
Ice melting (Solid to Liquid) Ice cream mix freezing (Liquid to Solid) For these phase changes to occur energy is transferred – from the ice cream mix to the ice.

10 Ice Cream Lab - materials
Ingredients   .5 liters milk 110 ml sugar 2.5 ml vanilla 1.5 liters ice 180 ml salt toppings Hey, wait. My measuring cups are in English Units. Uh-oh, CONVERSIONS

11 Ice Cream Lab – materials in English units
Ingredients   .5 liters milk = .53 quarts ~ 2 cups 110 ml sugar = 3.63 ounces ~ ½ cup 2.5 ml vanilla = .5 teaspoon 1.5 liters ice = 1.6 quarts ~ 6 cups 180 ml salt = 5.94 ounces ~ ¾ cup toppings

12 Ice Cream Lab – more materials
1 gallon size Ziplock bag 1 quart size Ziplock bag measuring cups measuring spoons spoons bowls

13 Procedure Put milk, sugar, and vanilla into quart bag. Squeeze out as much air as possible and close bag securely. Place quart bag in gallon bag. Add ice and salt. Seal large bag. Knead the small bag inside the large bag to expose the mixture to the cold temperatures. You can also roll the bag back and forth on the lab table. Knead for about 10 minutes. Check to see if the mixture is frozen. If not knead longer. When frozen remove smaller bag. Carefully open it, being sure to wipe seal of salt water first. Place in cups, top, enjoy. Answer and turn in analysis questions.

14 OKAY Go for it.

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