Calorimeter Practice Questions
18 free Calorimeter practice questions for the General Science. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
What is the primary purpose of a calorimeter in scientific experiments?
- A To measure heat changes in a chemical or physical process
- B To measure the electrical resistance of a circuit
- C To determine the density of an unknown liquid
- D To measure the pressure changes inside a sealed gas container
Correct answer: To measure heat changes in a chemical or physical process
A calorimeter is an instrument used to measure the amount of heat exchanged during chemical reactions or physical processes. It helps scientists determine energy changes such as heat released or absorbed.
Which principle does calorimetry primarily rely on?
- A Conservation of mass
- B Conservation of momentum
- C Conservation of energy
- D Archimedes' principle
Correct answer: Conservation of energy
Calorimetry is based on the law of conservation of energy. Heat lost by one substance equals the heat gained by another within an isolated system.
Which component in a simple calorimeter is used to measure temperature change?
- A Thermometer
- B Mercury barometer
- C Ammeter
- D Voltmeter
Correct answer: Thermometer
A thermometer is used inside a calorimeter to measure temperature changes in the reacting system. These temperature changes are used to calculate heat transfer.
Which type of calorimeter is commonly used to measure heat of combustion?
- A Bomb calorimeter
- B Ice calorimeter
- C Flow calorimeter
- D Adiabatic calorimeter
Correct answer: Bomb calorimeter
A bomb calorimeter is designed to measure the heat of combustion of substances. The sample is burned in a sealed container surrounded by water, and the temperature rise is recorded.
In calorimetry, the term 'specific heat capacity' refers to:
- A Heat required to raise unit mass by 1°C
- B Total heat energy stored in a system
- C Heat required to melt a unit mass of solid
- D Heat needed to vaporize a substance fully
Correct answer: Heat required to raise unit mass by 1°C
Specific heat capacity is the amount of heat needed to raise the temperature of one unit mass of a substance by one degree Celsius. It is used in calorimetry calculations to determine heat transfer.
Which material is often used to make simple calorimeters because it reduces heat loss?
- A Glass
- B Plastic
- C Polished copper
- D Styrofoam
Correct answer: Styrofoam
Styrofoam is commonly used in simple calorimeters because it provides good thermal insulation. This reduces heat exchange with the surroundings and improves measurement accuracy.
What does a calorimeter measure when studying chemical reactions?
- A Reaction speed
- B Energy changes
- C Pressure changes
- D Color changes
Correct answer: Energy changes
Calorimeters measure the energy changes associated with chemical reactions. By observing temperature changes, scientists can calculate the heat absorbed or released.
Which law states that heat lost by a hot object equals heat gained by a cold object in an isolated system?
- A Newton's law of cooling
- B Law of conservation of energy
- C Zeroth law of thermodynamics
- D Ohm's law of electrical resistance
Correct answer: Law of conservation of energy
The law of conservation of energy states that energy cannot be created or destroyed. In calorimetry, this means heat lost by one substance equals heat gained by another.
Which substance is usually placed around the reaction chamber in a calorimeter to measure temperature change?
- A Oil
- B Water
- C Mercury
- D Alcohol
Correct answer: Water
Water is commonly used in calorimeters because it has a well-known specific heat capacity. Measuring the temperature change of water helps calculate the heat involved in a reaction.
Which calorimeter is specifically designed to minimize heat exchange with the surroundings?
- A Differential calorimeter
- B Adiabatic calorimeter
- C Copper calorimeter
- D Simple calorimeter
Correct answer: Adiabatic calorimeter
An adiabatic calorimeter is designed to prevent heat exchange with the environment. This allows highly accurate measurement of heat produced or absorbed during reactions.
Which type of calorimeter measures heat based on the melting of ice?
- A Bomb calorimeter
- B Ice calorimeter
- C Flow calorimeter
- D Gas calorimeter
Correct answer: Ice calorimeter
An ice calorimeter measures heat by determining how much ice melts during a process. The amount of melted ice corresponds to the heat absorbed.
In the calorimetry formula Q = mcΔT, which quantity is normally taken from a reference table rather than measured during the experiment?
- A Mass of the substance placed inside
- B Rise in temperature of the water sample
- C Final temperature of the mixture
- D Specific heat capacity of the liquid
Correct answer: Specific heat capacity of the liquid
In Q = mcΔT the specific heat capacity c is a fixed property of the material, so it is looked up in a data table. The mass is weighed on a balance and the temperatures are read from a thermometer while the experiment runs.
Which field commonly uses calorimeters to study food energy content?
- A Marine biology
- B Observational astronomy
- C Structural geology
- D Nutrition science
Correct answer: Nutrition science
Nutrition science uses calorimeters to measure the energy content of food. The heat released when food burns indicates the number of calories it provides.
What does the symbol 'Q' represent in calorimetry equations?
- A Temperature
- B Mass
- C Density
- D Heat energy
Correct answer: Heat energy
In calorimetry equations, Q represents heat energy transferred during a process. It can be calculated using mass, specific heat capacity, and temperature change.
A bomb calorimeter is most commonly used to measure which quantity of a fuel sample?
- A Ignition temperature
- B Rate of burning
- C Vapor pressure
- D Heat of combustion
Correct answer: Heat of combustion
A bomb calorimeter burns a weighed fuel sample in excess oxygen inside a sealed steel vessel and records the temperature rise of the surrounding water. That temperature rise gives the heat of combustion of the fuel.
Which instrument inside a calorimeter ensures the mixture remains uniform during measurement?
- A Stirrer
- B Barometer
- C Manometer
- D Pipette
Correct answer: Stirrer
A stirrer keeps the liquid in the calorimeter evenly mixed. This ensures that temperature measurements accurately represent the entire system.
Which unit is commonly used to express heat energy in calorimetry?
- A Newton
- B Tesla
- C Watt
- D Joule
Correct answer: Joule
Heat energy is commonly measured in joules in the SI system. Calorimetry experiments often calculate heat transfer in joules using temperature change and specific heat capacity.
Why is a lid often placed on a calorimeter during experiments?
- A To raise the pressure inside the vessel
- B To speed up the chemical reaction
- C To prevent heat loss and evaporation
- D To measure the mass of the contents
Correct answer: To prevent heat loss and evaporation
A lid helps prevent heat exchange with the environment and reduces evaporation. This improves the accuracy of heat measurements in calorimetry experiments.