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Change of Phase and Laws of Thermodynamics Flashcards | StudBud
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Change of Phase and Laws of Thermodynamics
Change of Phase and Laws of Thermodynamics
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A physics Quiz to learn key concepts about change of phase and the Laws of Thermodynamics
Flashcards
22 cards
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Questions
22
Answers
1
Which usually contains more water vapor - warm air or cool air?
Cool Air
Warm air
They are the same.
2
The freezing temperature of a liquid is lowered by
Adding other substances to it
keeping the air warm
3
Water only boils at 100 Celsius.
False
True
4
Evaporation is a cooling process, what warms and what cools?
Air cools and water warms
Water cools and air warms
5
Relative humidity is how much
water vapor is in the air vs. the limit for that temperature
water vapor can be in the air
6
Evaporation is a change of phase...
...from liquid to vapor at the surface of a liquid.
...a vapor to a liquid in a body of water.
7
Why does a dog pant on a hot day?
To cool by evaporation in mouth and bronchials
He likes the way his drool looks on the pavement.
He is hot.
8
Perspiration cools us because...
...the evaporation of perspiration is a cooling process.
The perspiration insulates us against the heat.
9
Why is a pressure cooker even more useful when cooking food in the mountains than at sea level?
It helps add pressure so cooking temperatures increase.
It helps the food stay compact
10
Why will you feel less chilly if you dry off inside the shower instead of stepping out of it?
Shower walls are heated.
Condensation inside the stall counteracts the evaporation
11
Do all the molecules in a liquid have about the same speed, or much different speeds?
Same speed
Much different speeds
12
How many cats does Ms. Bilodeau's family have at home?
4
7
1
3
13
Why does antifreeze or any soluble substance put in water lower its freezing temperature?
It slows down the formation of hexagonal ice structures
It makes it thicker so it takes longer to freeze
14
How can water be made to boil and freeze at the same time?
Drastically reduce the pressure
Apply heat and cold at the same time
15
Does a vapor give off or absorb energy when it turns into a liquid?
Gives off
Absorbs
16
Why does the temperature at which a liquid boils depend on atmospheric pressure?
The pressure squashes the the vapor bubbles
Pressure forces things to boil faster
17
What are the 3 common phases of matter?
Fire, Water, Air
Solid, Liquid, Gas
18
What is regelation?
When melting is caused by pressure
Rules that molecules must follow
19
How can you tell if the rate of evaporation equals the rate of condensation?
Water level in a container or body of water stays the same.
There is fog.
The water level increases
The air is colder
20
Calculate the energy in Joules absorbed by 20g water that warms from 30C to 90C
140 Joules
54,000 Joules
1200 Joules
5014.8 Joules
21
Evaporation is a ...
...cooling process.
...heating process.
...neither a heating or cooling process.
22
Will potatoes cook faster in rapidly boiling water or gently boiling water?
They would cook the same either way.
Rapid boiling
Gently boiling
