Vocab
Heat/Cool Curves
LOL diagrams
Equations
100
What is the difference between an exothermic and endothermic reaction?
Exo= heat exits
Endo= heat enters
100
Which line segment best represents a gas heating?
E-F
100
what is the purpose of an arrow in an LOL diagram?
To show if/how much energy is flowing in or out of the system
100
Use the back of your periodic table for equations/constants. INCLUDE UNITS
How much energy is released when I heat 30g of water in a microwave from 20 degrees to 80 degrees?
Q=mcAT
Q= (30)(4.18)(80-20)
Q= 7,524 J
200
What is the difference between heat and temperature?
Heat= transfer of energy
Temp= measure of energy/movement energy.
200
I place a bowl of soup in the microwave for 2 minutes . Which line segment best describes this scenario?
C-D
200
What is the difference between ETh and EPH on an LOL diagram? Describe them
ETh = Thermal energy=temp
EPH = Phase energy= spacing of particles
200
Use the back of your periodic table for equations/constants. INCLUDE UNITS
How much energy is released when I boil 500g of water?
Q=Hm
Q= (500)(2260)
Q=1,130,000J
300
List the units we use for Q, m, c, and T in order for this unit
J, g, J/goC, oC
300
What line segment represents melting?
B-C
300
Draw an LOL for hot cooked macaroni sitting on a table over time.
LOL before: ETH 4, EPH 1
Arrow out: Macaroni -2
LOL after: ETH 2, EPH 1
300
Use the back of your periodic table for equations/constants. INCLUDE UNITS
What is the energy released when I freeze 15g of water into ice at 0 deg?
Q=Hm
Q= (-334)(15)
Q= -5010 J
400
Explain what specific heat is.
Specific heat: the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree.
400
List all the line segments Where Phase energy is increasing
B-C
AND
D-E
400
Draw an LOL for Water Vapor condensing on a cold window.
LOL before: ETH 1, EPH 4
Arrow out water: -2
LOL after: ETH 1, EPH 2
400
Use the back of your periodic table for equations/constants. INCLUDE UNITS
What is the total energy required to heat 45g water from 50 to 100 degrees and then boil it completely?
Q= (45)(4.18)(100-50) -->9,405J
Q=(2260)(45) --> 101,700J
Qtotal= 111,105
500
1.When do you use heat of fusion?
2.When do you use heat of vaporization?
(List ALL times)
Hf= melting/-freezing
Hv= boiling/-condensing
500
Draw and label all the blanks to this cooling curve
500
Draw an LOL for the complete process of Ice melting then warming up to room temp.
LOL before: ETH 1, EPH 1
Middle: ETH 1, EPH 2
LOL end: ETH 2, EPH 2.
500
Use the back of your periodic table for equations/constants. INCLUDE UNITS
What is the energy content of a peanut given the following: A 3g peanut is burned in a calorimeter with 150g water at 20 degrees. After burning, the temperature increases to 55 degrees and the mass of the peanut is now 1.5g.
Qwater=mcAT
Q=(150)(4.18)(55-20) -->21,945 J
Energy content= J/g = 21,945 J/1.5g
=14,630 J/g