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What is the change in internal energy if 20 joules of heat is released from a system and the system does 50 joules of work on the surroundings?
-70 Joules
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What is the change in the internal energy of a system that absorbs 2.500J of heat and that does 7.655J of work on the surroundings is?
The change in internal energy is the sum of heat added to the system and work done by the system on the surroundings. So, the change in internal energy is 2.500J (heat absorbed) - 7.655J (work done), resulting in a change of -5.155J.
How does the energy of a substance change during an exothermic change?
During an exothermic change, energy is released from the substance in the form of heat to the surroundings. This results in a decrease in the internal energy of the substance, leading to a decrease in its temperature.
Which of these processes have the same magnitude of energy change but are opposite in sign?
Endothermic and exothermic reactions have the same magnitude of energy change but are opposite in sign. In an endothermic reaction, energy is absorbed from the surroundings, while in an exothermic reaction, energy is released to the surroundings.
A system gives off 196 kJ of heat to the surroundings and the surroundings do 4.20 x 10?
The surroundings do 4.20 x 10^3 J of work on the system, as work done by the surroundings is considered positive. The change in internal energy of the system is 196 kJ - 4.20 kJ = 191.8 kJ. This change includes the energy flow as heat and work.
What is the difference of the endothermic and exothermic change?
An endothermic change requires heat, and an exothermic change releases heat.
What is the change in the internal energy of a system that absorbs 2.500J of heat and that does 7.655J of work on the surroundings is?
The change in internal energy is the sum of heat added to the system and work done by the system on the surroundings. So, the change in internal energy is 2.500J (heat absorbed) - 7.655J (work done), resulting in a change of -5.155J.
How does the energy of a substance change during an exothermic change?
During an exothermic change, energy is released from the substance in the form of heat to the surroundings. This results in a decrease in the internal energy of the substance, leading to a decrease in its temperature.
What is the relationship between the work done by an expanding gas and the change in its internal energy?
The work done by an expanding gas is directly related to the change in its internal energy. When a gas expands, it does work on its surroundings, which can lead to a change in its internal energy. This change in internal energy is a result of the work done by the gas during the expansion process.
A system gives off 196 kJ of heat to the surroundings and the surroundings do 4.20 x 10 2 kJ of work on the system What is the change in internal energy of the system?
3.0 x10 1 kj A system gives off 196 kJ of heat to the surroundings and the surroundings do 4.20 x 10³ kJ of work on the system. What is the change in internal energy of the system? --- 224 kj
The system adsorbs energy from its surroundings?
The system absorbs energy from its surroundings, increasing its internal energy. This can lead to temperature increases or other forms of energy storage within the system. Adsorption is the process of collecting and retaining molecules on the surface of a material.
What is different between exothermic and endothermic reactions?
If energy is released as a result of a process, an exothermic change has taken place. If a constant input of energy is required to drive a physical or chemical change, the change is described as endothermic.
What type of phase change does a substance absorb energy from its surroundings?
When a substance absorbs energy from its surroundings, it undergoes a phase change known as endothermic. This results in an increase in the substance's internal energy, allowing it to transition from one state to another (e.g., from solid to liquid or from liquid to gas) by absorbing heat from its surroundings.
What is the relationship between adiabatic processes and the change in enthalpy (H)?
In adiabatic processes, there is no heat exchange with the surroundings, so the change in enthalpy (H) is equal to the change in internal energy (U). This means that in adiabatic processes, the change in enthalpy is solely determined by the change in internal energy.
Is in the adiabatic process change in internal energy is equal to change in work done?
In an adiabatic process, where there is no heat exchange with the surroundings, the change in internal energy is equal to the negative of the work done. This relationship is a result of 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.
What is a change in which energy is released called?
A change in which energy is released is called an exothermic reaction. In exothermic reactions, energy is given off in the form of heat to the surroundings. This results in a decrease in the overall energy of the system.
When reactants change to products do the chemicals lose or gain energy?
The formation of bonds causes an energy release, while the breaking of bonds causes an absorption of energy. In a combustion reaction c+o2 --> co2, the reactants have a higher internal energy than the products resulting in a negative internal energy because energy is flowing out of the system to the surroundings. However in co2 ---> c+o2, the reactants have a lower internal energy than the products, so the internal energy of the system is positive as energy is flowing into the system from the surroundings.
Contrast what happens to thermal energy in evaporation and condensation?
In evaporation, the heat is transferred to the substance being evaporated from some heat source or the surroundings. It is released by the substance.
