Equations
Phase Changes
Temperature
Heat Transfer
Other
100
m stands for ________ and is measured in ______
mass, g, kg
100
To melt something, energy must be
added
100
Which way is the energy moving if something feels cold?
Out of your hand
100
Warm air flowing out of a room to the outside (which is cold) is...
convection
100
Describe how molecules move in a liquid
flow past each other, fill bottom of container
200
Q stands for _______ and is measured in ________
Heat, J or kJ
200
To condense something, energy must be
removed
200

What is the melting and boiling point of water in Celsius and Fahrenheit?

0 & 100 C, 32 & 212 F

200

Give an example of thermal equilibrium through conduction.

Direct contact

200
Density is defined as
mass/volume
300
L stands for _______ and is measured in ________
Latent heat constant, J/g or kJ/kg
300
While something is boiling, the temperature...
stays constant
300

How does heat spread out?

Hot molecules bump in to cold molecules and transfer their energy so it spreads out

300
What is the specific heat of water and why is it important for life?
High- helps earth stay warm at night (oceans)
300
How can you compare the density of two different objects?
Floating in water Calculate
400

Solve Q = mL for m=?

Q/L

400

The temperature stays constant during a phase change because

energy is absorbed for the phase change, not to change temperature, breaking the bonds

400

What temperatures are best for snowmaking and why?

Below 30 degrees F, so water freezes faster/better

400
Do living things reach thermal equilibrium? Why or why not?
No- need to keep ourselves warm to be alive!
400
Relate snowmaking to thermal equilibrium.
Water is shot into the air, and because has more heat than the air, heat goes into the air to try to achieve thermal equilibrium and water freezes
500

Latent heat vaporization is used for which phase changes?

Boiling, condensing

500
During a phase change, the graph of heat added vs. temperature is
flat
500

Why do conductive solids "feel" colder or hotter?

Heat travels faster through them, so is transferred to or away from your hand more quickly

500

Give an example of convection

Something flowing over something else and transferring energy (convection oven, stream/river, wind)

500

If a cube has a mass of 100 grams and each side is 10 cm, what is the density?

0.1 g/cubic centimeters

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