Endothermic Reaction and Specific Heat Capacity Quiz

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What is the device that measures the heat transferred at constant pressure?

Calorimeter

What is the formula for specific heat capacity?

c = q / (m * ΔT)

What is the unit for specific heat capacity?

J/g∙K

According to the law of energy conservation, what is the relationship between the heat given out by the solid and the heat absorbed by the water?

The heat given out by the solid is equal to the heat absorbed by the water. Signup and view all the answers

What is the formula for calculating the change in enthalpy (ΔH)?

ΔH = q / n Signup and view all the answers

What is the unit for the change in enthalpy?

kJ/mol Signup and view all the answers

Define thermodynamics and thermochemistry.

Thermodynamics is the study of energy and its transformations. Thermochemistry is a branch of thermodynamics that deals with the heat involved in chemical and physical changes. Signup and view all the answers

Explain the concept of internal energy in a system.

Internal energy, E, of a system is the sum of the potential and kinetic energies of all the particles present. Signup and view all the answers

What are the system and surroundings in thermodynamics?

The system is the contents of the reaction flask, while the surroundings include everything else. Signup and view all the answers

Describe the law of energy conservation.

When energy is transferred from one object to another, it appears as work and/or heat. Signup and view all the answers

How is heat involved in chemical and physical changes?

When energy is transferred from one object to another, it appears as work and/or heat. Signup and view all the answers

Why is a clear definition of the system and surroundings necessary in energy transfer studies?

A meaningful study of any transfer of energy requires a clear definition of both the system and its surroundings. Signup and view all the answers

Define specific heat capacity. What is the specific heat capacity of copper (Cu) in J/g∙K?

Specific heat capacity is the quantity of heat required to change the temperature of 1 gram of the substance by 1 K. The specific heat capacity of copper (Cu) is 0.387 J/g∙K. Signup and view all the answers

Explain the difference between an endothermic and exothermic process in terms of energy change.

In an endothermic process, energy is absorbed from the surroundings, resulting in a positive change in enthalpy (ΔH). In an exothermic process, energy is released to the surroundings, resulting in a negative change in enthalpy (ΔH). Signup and view all the answers

Calculate the quantity of heat needed to raise the temperature of 150 g of water from 20ºC to 80ºC. The specific heat capacity of water is 4.184 J/g∙K.

The quantity of heat needed is 25,104 J. Signup and view all the answers

Explain the law of energy conservation in the context of heat transfer.

The law of energy conservation states that energy cannot be created or destroyed, only transferred or converted from one form to another. In heat transfer, the total amount of heat lost by the system is equal to the total amount of heat gained by the surroundings. Signup and view all the answers

What is the internal energy of a system, and how is it related to heat and work?

The internal energy of a system is the sum of the kinetic and potential energies of its particles. It is related to heat and work through the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system on its surroundings. Signup and view all the answers

Explain how a coffee-cup calorimeter can be used to measure heat changes in a reaction.

A coffee-cup calorimeter can measure heat changes by using its known heat capacity to determine the heat absorbed or released during a reaction. By monitoring temperature changes in the system, the calorimeter can calculate the heat exchanged based on the specific heat capacity and temperature change. Signup and view all the answers