Terms
What is the variable for heat.
Q (ΔH, ok)
What is the unit for mass?
grams, g
When the temperature changes in a system, which equation do we use?
Q=CmΔT
Cold flows from one item to another.
True or False
False
Water has a high specific heat.
True or False
true
What is the variable for Temperature.
T
What is the unit for temperature?
ºC, Celsius
When ice melts, does it change temperature?
no
When a system gets cold it is called _________
(endothermic or exothermic)
endothermic
Metals have a ______ specific heat.
low
What is the variable for specific heat.
C
What is the unit for heat?
joules, j
kilojoules, KJ
calories, cal
Which equation would you use if the temperature does NOT change?
Q=nΔH
When heat is added to a system it is called ________.
endothermic
You are trying to find the amount of heat needed to raise 35 g of wax at 35 ºC to 45 ºC. Which equation would you use?
Q=CmΔT
What does m stand for?
mass
What are the units for Specific Heat?
j/gºC
cal/gºC
If you are given a substance in grams and have to use the equation q=nΔH, what do you have to do first?
"mole it out"
convert to moles
Water freezing is __________.
(endothermic or exothermic)
exothermic
You are trying to find the amount of heat needed to raise 35 g of wax at 35 ºC to 45 ºC. What information is still needed (missing)?
specific heat of wax
What does n stand for?
moles
What is the unit we use to measure the energy in food? be specific
Calorie
kilocalorie
Rearrange the formula Q=CmΔT to solve for mass.
Q/CΔT
If you are boiling water on the stove, and then turn up the heat, the temperature of the boiling water will increase.
True or False
False
Firewalkers are able to walk across hot coals without burning their feet. How?
DAILY DOUBLE!!
The cells in the feet contain water and water has a high specific heat. That means it will not change temperature very much as long as the walker does not stop.