Phase & Energy Changes

Question 1

What does temperature measure?

Answer 1

average kinetic energy

Question 2

If temperature is changing what else is changing

Answer 2

kinetic energy

Question 3

What is the kelvin conversion formula?

Answer 3

K=C+273 (in ref table T)

Question 4

How does heat flow?

Answer 4

Hot to cold

Question 5

Which formula is used to calculate heat when the temperature changes? What is the value for C for water?

Answer 5

q=mCdeltaT (ref table T)

4.18 (table B)

Question 6

When is q=mHf used? What is the value for Hf?

Answer 6

For melting/freezing. (Ref table T) 334 (table B)

Question 7

What equation is used when a substance is boiling or condensing? What is the value of the constant?

Answer 7

q=mHv (ref table T)

2260 (table B)

Question 8

What happens to the temperature and energy during a phase change?

Answer 8

temperature and kinetic energy stays the same. Potential energy changes.

Question 9

What 3 phase changes are endothermic?

Answer 9

melting, vaporization and sublimation.

Question 10

Is condensation, freezing, and deposition endo or exothermic ?

Answer 10

exothermic

Question 11

What phase has a regular geometric shape?

Answer 11

solid

Question 12

What phase takes the shape and volume of its container?

Answer 12

gas/vapor

Question 13

Where can melting and boiling points be found?

Answer 13

In reference table S

Question 14

What is STP or standard temperature?

Answer 14

273K (ref table A)

Question 15

What is normal boiling point?

Answer 15

When the vapor pressure equals normal/standard atmospheric pressure. (Ref table A- 101.3 kpa or 1.00 atm))

Question 16

When temperature increases, what happens to vapor pressure?

Answer 16

As temperature increases, vapor pressure increases.

Question 17

Which liquid on ref table H has the weakest intermolecular forces?

Answer 17

Propanone: lowest normal boiling point and highest vapor pressure.