Chapter 15 - Temperature, Heat, & Expansion Flashcards
What produces Warmth/Heat?
Atoms and molecules that have KE produce warmth/heat.
What is Temperature?
Temperature is the average kinetic energy.
What is the relationship between temperature & expansion vs. contraction?
Increased temperature means expansion.
Decreased temperature means contraction.
At what temperature does water Freeze?
Water freezes at 0 degrees C.
(32 degrees F).
At what temperature does water Boil?
Water boils at 100 degrees C.
(212 degrees F).
What is Absolute Zero?
Absolute zero is 0 Kelvins & -273 degrees C.
Does matter contain Heat?
NO! Matter contains internal energy, NOT heat.
What is Heat?
Heat is the energy transferred from one object to another because of a temperature difference.
In what direction does Energy/Heat travel?
Energy/heat always travels from the warmer object to the cooler object.
What is Internal Energy?
Internal energy is the grand total of all the energies inside a substance.
What are the units for Heat?
Convert to each.
Joules (J) OR calories (c).
1 calorie = 4.19 Joules.
What is Specific Heat Capacity?
Specific heat capacity is the amount of heat required to change the temperature of a unit mass off the substance by 1 degree C.
What is the relationship between high/low specific heat capacity & warming speed?
Low specific heat capacity = warm quickly.
High specific heat capacity = warm slowly.
Is the High Specific Heat Capacity of Water higher or lower than most materials? Why?
It is higher because it has strong hydrogen bonds.
Why do materials contract when they are cooled?
Molecules “jiggle” slower and take up less space.
