7th Grade-Ch 2 Sec 2 Changes Of State
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Transcript of 7th Grade-Ch 2 Sec 2 Changes Of State
Ch. 2Sec. 2
Changes of State
change of state
description
melting solid liquid
freezing liquid solid
vaporization liquid gas
evaporation • type of vaporization • takes place only on surface of liquid
boiling • type of vaporization• takes place throughout liquid
condensation gas liquid
sublimation solid gas
melting • solid liquid
• thermal energy added particles move faster
melting point• specific temp. @
which substance melts
• melting point of pure water = 0oC
• characteristic property
freezing
• liquid solid
• opposite of melting
vaporization
• liquid gas
• thermal energy added particles move faster
• 2 types:
1. evaporation
2. boiling
boiling
• liquid gas
boiling point
• temp. @ which liquid boils
• used to identify unknown substances
evaporation• liquid gas
condensation
•opposite of vaporization
•when particles in a gas lose enough energy to become a liquid
sublimation• change of state from solid directly gas
dry ice = solid carbon dioxide
# INGREDIENT1-5 Box of rock salt
6-18 Quart of whole milk19-20 Box of vanilla extract21-26 2 lb bag of sugar27-30 Box of gallon size
FREEZER BAGS (30+)31-33 Box of quart size
FREEZER BAGS (30+)
HOMEMADE ICE CREAM
Recipe for homemade ice creamIngredients:• 1 cup of whole milk • 2 tbl. of rock salt or 1/4 cup table salt• 2 tbl. of sugar• 1 tsp. vanilla extract• 2 cups of ice• 2-heavy duty (freezer) quart size ziploc bags• 2-heavy duty (freezer) gallon size ziploc bags
Directions1. Put ice and rock salt into the gallon size ziploc bag. Double bag. 2. Pour the sugar, milk and vanilla into the quart size bag. Double bag.3. Seal the quart size bag. Remove air. 4. Place quart size bag inside the gallon size bag. Seal the bag.
Remove air.5. Shake the bag for about 15 minutes until mixture begins to solidify. 6. Enjoy!