WorksheetsCalorimetry - OCR GCE Chemistry A-Level
Total questions: 21
Worksheet time: 38mins
In Q = mcΔT, what does 'Q' stand for?
Energy transferred from the surroundings
Energy transferred to the surroundings
The enthalpy change of reaction
The enthalpy change of the surroundings
In Q = mcΔT, what does 'm' stand for?
The mass of reactant used
The moles of reactant used
The mass of liquid in the calorimeter
The moles of solution in the calorimeter
In Q = mcΔT, what does are the typical units of m?
metres
mm
kg
g
In Q = mcΔT, what is c?
the specific heat capacity of the liquid in the calorimeter
the specific heat capacity of the products
the specific heat capacity of the reactants
the specific heat capacity of the calorimeter
What is the specific heat capacity of water in Jmol-1K-1?
8.31
8.314
4.183
4.18
What is the density of water in gcm-3?
0.100
18
1.00
100
If a reaction heats up some aqueous copper sulfate, what assumption do we make about the solution?
It has a specific heat capacity of zero, and a density of 1 gcm-3
It has a specific heat capacity of 4.18 Jg-1K-1, and a density of 1 gcm-3
It has a specific heat capacity of zero, and a density of 4.18 gcm-3
It has a specific heat capacity of zero, and a density of 4.18 gcm-3
In Q = mcΔT, what are the units of ΔT?
oC
K. Using oC will give the incorrect answer
K, although using oC will give the correct numerical answer
Joules
If ΔH = -Q/n, what is n?
The moles of product in the balanced chemical equation, as written
The moles of reactant in the balanced chemical equation, as written
The moles of whatever has stoichiometry of '1' in the equation, as written
The total moles of reactants used in the reaction
A chemist is caluclating ΔH = -Q/n for the enthalpy change of combustion of propane.
What 'n' should be used?
The moles of water formed through the combustion reaction
The moles of oxygen needed for full combustion
The moles of carbon dioxide formed
The moles of propane burned
A chemist is calculating ΔH = -Q/n for the enthalpy change of neutralisation of the reaction between sulfuric acid and sodium hydroxide
What value for 'n' should be used?
What 'n' should be used?
The moles of water formed through the neutralisation reaction
The moles of acid
The moles of alkali
The total moles of salt formed
A chemist studies the endothermic enthalpy change when solid ammonium nitrate is dissolved in water.
What is the most appropriate for 'm' in 'Q = mcΔT'?
The mass of ammonium nitrate used
The mass of water in the calorimeter
The mass of the solution formed
The mass of the calorimeter
A chemist studies the enthalpy change of combustion of propan-1-ol.
Tick all features of a suitable calorimeter
Made from copper
Made from polystyrene
Has a lid
Contains water
Contains propan-1-ol
A chemist studies the enthalpy change of reaction for the reaction of zinc with copper sulfate:
Zn(s) + CuSO4(aq) -> ZnSO4(aq) + Cu(s)
Tick all features of a suitable calorimeter
Made from copper
Made from polystyrene
Has a lid
Contains water only
A chemist studies the enthalpy change of combustion of propan-1-ol.
The calculated enthalpy of combustion is less exothermic than expected.
What are possible reasons for this?
Complete combustion
Incomplete combustion
Heat loss to the laboratory
The spirit burner was only extinguished 30secs after it was removed.
Some water was spilled when filling the calorimeter.
-1350 kJ mol-1
-1850 kJ mol-1
-1750 kJ mol-1
-1650 kJ mol-1
Write your answer to 3sf in kJmol-1
(a)
-222 kJmol-1
-212 kJmol-1
-202 kJmol-1
-242 kJmol-1
-262 kJmol-1
Write your answer in kJmol-1 to 2sf
(a)
Write your answer in kJmol-1 to 3sf
(a)
Write your answer in kJmol-1 to 3sf
(a)
