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WorksheetsThermochem
Total questions: 20
Worksheet time: 20mins
when using thermo formulas, mass should always be in
grams
pounds
temperature
joules
You have a hot cup of coffee sitting on a table. If the cup is the system is it an endothermic or exothermic heat exchange?
Endothermic
exothermic
The units for q are
J
J/ goC
kilograms
kj/mol
What are the units for specific heat capacity?
goCJ
joules
g
joules/gram
We use the MC Δ T formula whenever there is a....
temperature change
phase change
always
mass given
When would we use the MHv equation?
boiling/condensing
melting/freezing
temperature change
any phase change
If you have 5.73 grams of water boiling into a gas, how much energy is being lost?
about 13,000 J
about 2,000 J
about 24 J
about 0.003 J
When would we use the MHf equation
melting/freezing
boiling/condensing
temperature change
any phase change
You have a hot cup of coffee sitting on a table. If the cup is the system is it a positive or negative energy change?
positive
negative
A negative Q value means...
it was exothermic
it was endothermic
energy left and entered the system
it was reactive
A sample of 56 g of ice melts when sitting at room temperature. How much energy did it absorb?
18,704 J
126,560 J
0.167 J
56 degrees celcuis
If a sample of 5.2 g of water (c=4.18) loses 7,923 J of energy, what was the change in temperature?
364.5 Co
-364.5 Co
11,000 Co
32 Co
If your hand is holding an ice cube, what is the direction of heat travel?
from the hand to the ice
from the ice to the hand
we can't tell with the information given
Calculate ΔT when a substance goes from 10*C to 75*C
-65*C
75*C
10*C
65*C
Calculate A 50g sample is heated with 500 joules of energy and has a 10*C temperature change. Calculate it’s specific heat.
1 j/g*C
250000 j/g*C
500 j/g*C
10 j/g*C
4180 j of heat energy are added to change the temperature of water by 10*C. How many grams of water are being heated? cwater=4.18 j/g*C
4.18 j/g*C
10000g
174724g
100g
What heat energy is required to raise the temperature of a 1g sample of mercury (cHg=.16 j/g*C) by 100*C?
16j
.0016j
16000j
625 j
When two samples of similar mass are subjected to the same heat energy, the sample with the SMALLER specific heat will have a _________ temperature change.
SMALLER
LARGER
EQUAL
If you have a gram of iron next to 56 g of iron, which will have the greatest heat capacity?
56 g sample
1 g sample
we can't tell with the information given
A substance that is more difficult to heat up will have a _____ heat capacity.
higher
lower
