Calorimetry
Chemistry ⇒ Thermochemistry and Energetics
Calorimetry starts at 10 and continues till grade 12.
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A reaction in a calorimeter causes the temperature of the solution to drop. Is the reaction endothermic or exothermic?
A solution releases 500 J of heat to the surroundings. What is the sign of q for the system?
Describe how you would determine the specific heat capacity of an unknown metal using a calorimeter.
Describe the main sources of error in a calorimetry experiment.
A 10 g sample of a substance absorbs 250 J of heat, causing its temperature to rise by 5°C. Calculate its specific heat capacity.
A 200 g sample of water is cooled from 80°C to 30°C. Calculate the amount of heat lost by the water. (Specific heat capacity of water = 4.18 J/g°C)
A 25 g sample of a metal at 80°C is placed in 50 g of water at 20°C. The final temperature is 22°C. If the specific heat capacity of water is 4.18 J/g°C, calculate the specific heat capacity of the metal.
A 50 g metal block at 100°C is placed in 100 g of water at 25°C. The final temperature is 30°C. If the specific heat capacity of the metal is 0.4 J/g°C, calculate the heat lost by the metal.
A calorimeter is best described as: (1) A device to measure pressure (2) A device to measure heat changes (3) A device to measure mass (4) A device to measure volume
In a coffee cup calorimeter, which of the following is assumed to be constant? (1) Pressure (2) Volume (3) Temperature (4) Mass
Which of the following best describes the function of a stirrer in a calorimeter? (1) To increase the reaction rate (2) To ensure uniform temperature (3) To prevent evaporation (4) To add reactants
Which of the following equations is used to calculate the heat change in a calorimetry experiment? (1) q = m × c × ΔT (2) q = P × V (3) q = n × R × T (4) q = m × v × ΔP
The amount of heat required to raise the temperature of 1 gram of a substance by 1°C is called its __________.
The heat capacity of a calorimeter is also known as its __________.
The heat change in a reaction at constant pressure is called __________ change.
The heat change measured in a bomb calorimeter corresponds to the change in __________.
True or False: In an exothermic reaction, the temperature of the surroundings increases.
True or False: In calorimetry, the system is always the chemical reaction or physical process being studied.
True or False: The bomb calorimeter is used to measure the enthalpy change at constant pressure.
True or False: The heat absorbed by the calorimeter itself must be considered in accurate calorimetry experiments.
