WorksheetsWhat Is Thermo Chemistry Lesson
Total questions: 21
Worksheet time: 27mins
What are chemical reactions that absorb energy?
endothermic
fast
slow
exothermic
What is the study of heat changes that accompany chemical reactions and phase changes?
energy
chemistry
work
thermochemistry
What is the formula for calculating heat?
q = mcΔT
H = ΔH x moles
H = ΔH x grams
products - reactants
Convert 42 kJ into joules
0.042 J
175.73 J
42000 J
10.04 J
What are the two main types of energy?
endothermic and exothermic
spontaneous and nonspontaneous
potential and kinetic
entropy and enthalpy
Consider the reaction: 2 H2O + energy --> 2H2 + O2
exothermic because releasing energy
exothermic because absorbing energy
endothermic because absorbing energy
endothermic because releasing energy
A 500g piece of aluminum has a temperature of 7°C. What is the heat energy produced? Specific heat of Aluminum is 0.900 J/gºC.
3000 J
3000 g
3150 J
3150 g
What does temperature measure?
heat
average kinetic energy
space
time
How much heat does an aluminum block absorb if 10.00 grams is heated from 25.0oC to 50.0oC? *Specific heat of aluminum is 0.900 J/goC
450 J
-450 J
225 J
-225 J
A 24.0 gram sample of copper was heated from 25.0oC to 500.0oC, 4378 J of heat were absorbed, what is the specific heat of copper?
0.384 J/g°C
49909200 J/g°C
2.60 J/g°C
8.77 J/g°C
The specific heat of platinum is 0.133 J/g°C. How much heat is released when a 10 g piece of platinum cools from 100°C to 50°C?
66.5 J
665 J
0.0266 J
0.665 J
The temperature of an unknown piece of metal with a mass of 30.00 g changes from 25.0°C to 35.0°C when the metal absorbs 350.0 J of energy. What is the specific heat of the metal?
1.17 J/g°C
-1.17 J/g°C
0.857 J/g°C
-0.857 J/g°C
Releasing heat into the surroundings occurs during an ___________________ reaction.
Exothermic
Endothermic
Kinetic Energy
Thermal Energy
A sample of iron receives 50 J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?
25g
30g
20g
50g
If 238 J of heat is absorbed by a sample of metal with a mass of 40.7 g, and it raises the temperature from 20.0°C to 32.4°C, what is the specific heat capacity of the metal?
2.34 J/g°C
0.472 J/g°C
6.13 J/g°C
0.163 J/g°C
