WorksheetsGrade 12 midterm Revision
Total questions: 23
Worksheet time: 27mins
What is specific heat?
The amount of heat energy required to raise the temperature of a substance by a certain amount.
The amount of heat energy required to change the state of a substance
The ability of a substance to conduct heat
The measure of how hot a substance is
What is the formula to calculate change in enthalpy?
ΔH = Hfinal - Hinitial
ΔH = Hinitial - Hfinal
ΔH = Hfinal + Hinitial
ΔH = Hfinal x Hinitial
What is a thermochemical equation used for?
To represent energy changes in a chemical reaction.
To calculate the molar mass of a compound.
To determine the rate of a chemical reaction.
To balance chemical equations.
What is the symbol used to represent change in enthalpy?
ΔH
Q
E
H
What is the symbol used to represent standard change in enthalpy?
ΔH
Q
ΔH0
H
What is the law of conservation of energy?
Energy can be both created and destroyed.
Energy can be destroyed but not created.
Energy cannot be created or destroyed, only transferred or transformed.
Energy can be created but not destroyed.
What is the formula to calculate heat transfer?
Q = mcΔT
Q = mc
Q = mv^2
Q = mc^2
What are the two main types of energy?
potential energy and kinetic energy
solar energy and geothermal energy
gravitational energy and wind energy
nuclear energy and electromagnetic energy
A positive ΔH means the reaction is:
complete
at equilibrium
exothermic
endothermic
A negative ΔH means the reaction is:
complete
at equilibrium
exothermic
endothermic
How do you calculate Enthalpy of a reaction?
ΔH = ΔHproducts - ΔHreactants
ΔT = q / mC
ΔG = ΔH -TΔS
E = mc2
In the Image, will the heat (+177.8 KJ) be a product or a reactant?
Product
Reactant
How does energy flow?
It goes from hot to cold
It goes from cold to hot
It transfers without any particular means
It doesn't flow
How does energy change in a reaction?
It changes mass
It increases
It decreases
It transfers
What process is exothermic?
condensation
melting
baking a cake
boiling
The specific heat of copper is 0.39 J/g °C. What is the temperature change when 100 Joules of heat is added to 20 grams?
12.82 °C
24.12°C
351 °C
How many Joules are in 146 calories?
34.9 Joules
0.146 Joules
611 Joules
6111 joules
How many calories are in 125 Joules? (1 cal = 4.18 J)
523
29.9
0.0282
65.7
