Heat Transfer
A boy touches a stove and burns his hand. Which heat transfer process is this?
Conduction
Why do we use metal inside a lightbulb?
Metal is used to conduct electricity because it is a conductor.
When you add heat to a substance what happens to the molecules?
The molecules expand
True or False.
Dark colors absorb heat better.
True
How is heat transferred?
From warm to cool
Describe the process of convection.
Cool air/water sinks
Mark is designing a dog house. Which material would he use if he wanted to keep the dog house as cool as possible?
a. black metal
b. reflective plastic
c. light colored steel
d. dark cement blocks
B reflective plastic
What happens when heat is removed from a substance?
a. it evaporates
b. it condenses
c. it melts
b. it condenses
Why would you use a hot spoon to scoop out ice cream?
The hot spoon will melt the ice cream.
The heat moves from the spoon to the ice cream
How does a hot air balloon float?
(use contract or expand)
Heated air expands inside the balloon. It is lighter than the air so it floats.
Give an example of radiation
Sun, flame, fire
Why would aluminum foil be a good choice to wrap food that needs to be kept cool outside?
a. The properties of foil reflect the temperature of the food back on itself.
b. The shiny surface of foil reflects the heat and and helps keep some heat out.
B. the shiny surface of foil reflects the heat and helps keep some heat out.
I put a glass of cold water in a hot room. After a while the cold water is no longer cold. Why?
a. The heat from air transferred to the water in cup, making it warmer.
b. The heat from air caused the water in the cup to condense making it warmer.
a. The heat from air transferred to the water in cup, making it warmer.
Water is being boiled on the stove. What state of matter is change happening?
liquid to gas
A small ice cube at 0degrees is dropped into a cup of water at 28degrees. When the ice melts, what's the temperature of the water?
a. 0 degrees
b. between 0 degrees and 28 degrees
c. greater than 28 degrees
b. between 0 degrees and 28 degrees
Plastic is a poor conductor. Which object makes use of it?
a. hairbrush
b. cooler
c. bucket
b. cooler
Joe is spreading butter on toast. Which butter would he most likely use?
a. butter on the countertop
b. butter in the fridge