Chemistry: (2) First Three Notesheets
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What is heat?
The energy transferred between objects due to temp difference
If energy is (-) heat is _____________
If energy is (+) heat is _____________
given off, taken in
energy needed to change 1g of a substance to 1 degress Celsius
energy is __________ or ______________ during a phase change
given off or taken in
Do phase changes change the temp of a substance?
No, the temp changes AFTER a phase change
phase changes happen when _____________ ____________ are broken or formed
stronger __________ ____________ cause higher ______________ points
interparticle attractions; melting
happens below boiling point. only particles at surface change to gas
pressure caused by vaporized particles
as temperature _____________, vapor pressure _________________.
When does boiling happen?
When vapor pressure of liquid equals atmospheric pressure
Normal boiling point
when atmospheric pressure equals 1 atm
What are two cooling processes?
How does sweating make you cooler?
The particles with the highest KE evaporate, leaving cooler particles behind.
At absolute zero what happens to particles?
They stop moving. No Kinetic Energy
At the liquid state, are particles touching?
Same temperature= same __________ ___________
Same temperature = same kinetic energy of particles
How do you find the boiling point of a substance?
Find the temperature at which vapor pressure id the same as atmospheric pressure
In heat transfer, which way does heat always go?
From the higher temp object to the lower one
If a pot has been boiling for 20 minutes is it less hot, hotter or the same as when it first started to boil?
The same. As soon as water gets above its boiling point it will turn to gas
What is in between atoms?
nothing, not even air
What is in a bubble?
Bubbles are just an invisible form of water
What are four different types of models?
- 1) analyzing with computers
- 2) mental
- 3) mathematic
- 4) buildings/drawings
What is the difference between tempertaure and heat?
- heat is a transfer of energy due to temperature difference
- temperature is how fast particles are moving and how much kinetic energy a substance has
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