Variables
What does Q stand for?
Heat
This is the formula that includes heat, specific heat, mass, and temperature change
Q=mcΔT
A 100 g sample of a sample is heated from 20°C to 25°C. The specific heat of the sample is 4.0 J/g·°C. Calculate the heat absorbed, q.
2000 J
What is the change in temperature of an object whose initial temperature is 40 °C and reaches a final temperature of 65 °C?
15 °C
What is the title of this song?
Rock it, don't stop it
Everybody get on the floor
Crank the party up
We about to get it on (c'mon)
1,2 Step
How do you calculate ΔT?
Final temperature - Initial Temperature
A sample absorbs 4,000 J of heat. Its temperature increases by 5°C. The substance has a specific heat of 4.0 J/g·°C. Calculate the mass of the sample.
200 g
A 300 g metal sample warms from 10°C to 20°C. The metal’s specific heat is 2.0 J/g·°C. Calculate the heat absorbed, q.
6,000 J
A 100 g sample of water absorbs 2,000 J of heat. The specific heat of water is 4.0 J/g·°C. Calculate the change in temperature (ΔT).
Answer: 5°C
q=mcΔT
2000=100*4*ΔT
2000=400*ΔT
2000/400=400/400 * ΔT
5=ΔT
(ΔT = q ÷ mc = 2000 ÷ (100 × 4.0))
Who is the artist of this song?
That's where I'm gonna wait for you
I'll be looking out, night and day
Took my heart to the limit, and this is where I'll stay
I can't go any further than this
I want you so bad, it's my only wish
Black Eyed Peas
What is the unit for mass?
grams
A metal absorbs 4500 J of heat and warms by 15°C. The metal’s specific heat is 3.0 J/g·°C. Calculate the mass of the metal.
100 g
How much heat must be absorbed by 400 grams of water to raise its temperature by 25°C? (The specific heat of water is 4.18 J/g°C.)
41800 J
A 200 g metal sample at 20°C absorbs 4,000 J of heat. The metal’s specific heat is 2.0 J/g·°C. Calculate the final temperature of the metal.
30°C
q=mc(Tfinal-Tinitial)
4000=200*2*(Tfinal-20)
4000=400*(Tfinal-20)
4000/400=400/400*(Tfinal-20)
10=Tfinal-20
30=Tfinal
What movie is this song from?
I remember daddy told me
"Fairy tales can't come true
You gotta make 'em happen
It all depends on you"
Princess and the Frog
What does c stand for?
A 300 g sample absorbs 6,000 J of heat. Its temperature changes by 10°C. Calculate the specific heat of the substance.
2 J/g·°C
A 500 g substance absorbs heat as its temperature increases from 18°C to 30°C. Its specific heat is 2.0 J/g·°C. Calculate the heat absorbed, q.
12000 J
A 250 g substance absorbs 5,000 J of heat and ends at 30°C. Its specific heat is 2.0 J/g·°C. Calculate the initial temperature of the substance.
20°C
q=mc(Tfinal-Tinitial)
5000=250*2*(30-Tfinal)
5000=500*(30-Tfinal)
5000/500=500/500*(30-Tfinal)
10=30-Tfinal
10-30=-Tfinal
-20=-Tfinal
20 = Tfinal
Fill in the blank
Gotta change my answering machine
Now that I'm alone
'Cause right now it says that we can't come to the phone
And I know it makes no sense, 'cause you walked out the door
But it's the only way__________________________
I hear your voice anymore
What is the unit for specific heat?
J/g℃
A 400 g solid absorbs 32,000 J of heat while its temperature increases from 20°C to 40°C. Calculate the specific heat of the solid.
4 J/g·°C
A 400 g solid is heated from 15°C to 35°C. The solid has a specific heat of 2.5 J/g·°C. Calculate the heat absorbed, q.
20,000 J
A 400 g solid releases 8,000 J of heat as it cools. The solid’s specific heat is 2.0 J/g·°C. Its final temperature is 25°C. Calculate the initial temperature of the solid.
35°C
20°C
q=mc(Tfinal-Tinitial)
8000=400*2*(25-Tfinal)
8000=800*(25-Tfinal)
8000/800=800/800*(25-Tfinal)
10=25-Tfinal
10-25=-Tfinal
15= Tfinal
Fill in the blank
If I could escape (escape)
And recreate a place that's my own world (own world)
And I could be your favorite girl (forever), perfectly together
And tell me, boy, now wouldn't that be sweet? (Sweet escape)
If I could be sweet (be sweet)
I know I've been a real bad girl (I'll try to change)
I didn't mean for you to get hurt (whatsoever)
We can make it better
And tell me, boy, now,_________________________
wouldn't that be sweet?