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WorksheetsEnthalpy and Entropy
Total questions: 15
Worksheet time: 11mins
What is the symbol for entropy?
H
G
S
E
Entropy is a measure of
accuracy
precision
the disorder of a system
the attraction of a nucleus for an electron
Which of these reactions shows a DECREASE in entropy?
CaCO3(s) → CaO(s) + CO2(g)
3O2(g) → 2O3(g)
2NH3(g) → 3H2(g) + N2(g)
C6H6(l) → C6H6(g)
Which represents a decrease in entropy?
sublimation of CO2
boiling water
condensation of steam on cold glass
NaCl dissolving in water
What is enthalpy?
.a) Energy stored in the movement of molecules in a substance
b) The opposite of temperature
c) The temperature of a molecule
d) Energy stored in the chemical bonds in a substance
A reaction that gives out energy to the surroundings causes the surroundings ....
a. temperature to drop
temperature to rise
temperature to remain constant
temperature to vary
b. emperature to rise
c. temperature to remain constant
d. temperature to vary
What does all our work, provides all our heat, can be stored to use later, and never, ever goes away?
enthalpy
energy
our best friend
chemical bonds
What is the Law of Conservation of Energy?
Energy is equal to reactants and products
Energy can be created nor destroyed
Energy is used up but it can be replenish
Energy is conserved and preserved
A process where the system absorbs heat from the surroundings.
Exothermic Reaction
Endothermic Reaction
Enthalpy
Entropy
Study the reaction below. Is it exothermic or endothermic?
H2 + Cl2 --> 2 HCl + 1845 kJ
Exothermic Reaction
Endothermic Reaction
How do you calculate the Enthalpy of Reaction?
ΔH = ΔHproducts - ΔHreactants
ΔG = ΔH -TΔS
ΔT = q / mC
E = mc2
The SI unit of energy.
Calorie
calorie
Joules
enthalpy
Exothermic reactions feel ____.
warm
cold
