HUMMMMMMMMMMM
Name: _________________________ 1 2 3 4 5 6 7 8 9
1. You wake up in the middle of the night craving a glass of cold milk. You
sneak down to the refrigerator and open the door. Still asleep, you
stare at the contents of the refrigerator until you notice that your
bare feet are getting uncomfortable. Are they (COLD or HOT)
Explain? _____________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
2. You are installing a new heating unit in your house. You need to decide
the most energy efficient location for the heating vents-near the
ceiling or near the floor? Explain. ___________________________
____________________________________________________
____________________________________________________
__________________________________________________
____________________________________________________
3. On a very hot day, you enter a food market to buy an ice cream bar.
You walk down the ice cream aisle and, lifting the lid you reach over
the waist high horizontal freezer to pick up your ice cream. You notice
that the other freezers are upright and have doors. Which freezer
design is better for keeping cold air in? WHY?__________________
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
4. Your friend returns from a surfing trip at the ocean. She tells you
that she was treading water in the ocean for a long time waiting for
the right wave. She can’t remember ever being able to tread water
that long in a swimming pool. Can you give her any scientific reasons
involving density to explain why she floated better in the ocean?
____________________________________________________
____________________________________________________
____________________________________________________
5. Imagine you live on a tropical island surrounded by salt water. You dig
a well to find drinking water, but you find the well produces salty
water as well as fresh water. Where in the well would you expect to
find salty water? Fresh water? Explain_______________________
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
6. Your vacation includes a fishing trip to Crystal Bay where fresh river
water meets the ocean water. You are fishing for a type of fish that
lives in salt water. Would you put your fishing line in deep or shallow
water? Explain. ________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
7. As you read through the menu in the ice cream store you begin to
chuckle as you think about “Root Beer Floats” and “Root Beer Sinks”
Explain what makes ice cream float in Root Beer? (This one is tricky)
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
8. You are hot and tired from your basketball game, and a friend offers
you a glass of ice water. As you drink it, you notice the ice cubes
always float to the top and get in the way as you try to gulp the water.
Why do ice cubes float? Be specific _________________________
____________________________________________________
____________________________________________________
____________________________________________________
HUMMMMMMMMMMM
Name: Key 1 2 3 4 5 6 7 8 9
1. You wake up in the middle of the night craving a glass of cold milk. You
sneak down to the refrigerator and open the door. Still asleep, you
stare at the contents of the refrigerator until you notice that your
bare feet are getting uncomfortable. Are they (COLD or HOT)
Explain? The dense cold air is falling out of the fridge on your feet
2. You are installing a new heating unit in your house. You need to decide
the most energy efficient location for the heating vents-near the
ceiling or near the floor? Explain. Near the floor hot air rises so it will
warm you on the way up. If you put them on the ceiling the heat would
stay up there
3. On a very hot day, you enter a food market to buy an ice cream bar.
You walk down the ice cream aisle and, lifting the lid you reach over
the waist high horizontal freezer to pick up your ice cream. You notice
that the other freezers are upright and have doors. Which freezer
design is better for keeping cold air in? WHY? Horizontal cold air can
not fall out of them. The dense air is trapped
4. Your friend returns from a surfing trip at the ocean. She tells you
that she was treading water in the ocean for a long time waiting for
the right wave. She can’t remember ever being able to tread water
that long in a swimming pool. Can you give her any scientific reasons
involving density to explain why she floated better in the ocean?
Salt water is more dense than fresh because it has more stuff in it
(salt)
5. Imagine you live on a tropical island surrounded by salt water. You dig
a well to find drinking water, but you find the well produces salty
water as well as fresh water. Where in the well would you expect to
find salty water? Fresh water? Explain Fresh water on top of the
salty water (they should not mix) fresh water is LESS dense salt
water is more dense
6. Your vacation includes a fishing trip to Crystal Bay where fresh river
water meets the ocean water. You are fishing for a type of fish that
lives in salt water. Would you put your fishing line in deep or shallow
water? Explain. Deep water salt is more dense than fresh so the salt
will be on the bottom with a layer of fresh on top of it
7. As you read through the menu in the ice cream store you begin to
chuckle as you think about “Root Beer Floats” and “Root Beer Sinks”
Explain what makes ice cream float in Root Beer? (This one is tricky)
The carbon dioxide bubbles grab a hold of the ice cream lifting it up
8. You are hot and tired from your basketball game, and a friend offers
you a glass of ice water. As you drink it, you notice the ice cubes
always float to the top and get in the way as you try to gulp the water.
Why do ice cubes float? Be specific Ice molecules have a greater
volume than water (but the same mass) so Ice is less dense it floats