lost gained less than the same as endothermic exothermic greater than During the
ID: 1041708 • Letter: L
Question
lost
gained
less than
the same as
endothermic
exothermic
greater than
During the demonstration, 100 g of water at 50?C is mixed with 100 g of water at 20?C. The water at 20?C heat while the water at 50?C heat.
This means that if the 50?C water is viewed as the system, it underwent an process. If the 20?C water is viewed as the system, it underwent an process.
Once the solution reaches equilibrium, the temperature change for the 50?C water is the temperature change for the 20?C water. This is due to the fact that both substances were water and the mass of the 50?C water was the mass of the 20?C water.
In the next part of the demonstration, 20.0 g of copper metal at 200?C is mixed with 100 g of water at 20?C. The copper heat while the water heat.
If the copper is viewed as the system, it has undergone an process. If the water is viewed as the system, it has undergone an process.
Explanation / Answer
In an endothermic process, heat is absorbed /gained by the system while in an exothermic process heat is released / given out / lost by the system. Therefore, the part of the system which loses heat (therby cools down) undergoes an exothermic process and the part of the system which gains heat (therby heats up) undergoes an endothermic process.
During the demonstration, 100 g of water at 50oC is mixed with 100 g of water at 20oC. The water at 20oC gained heat while the water at 50oC lost heat.
This means that if the 50oC water is viewed as the system, it underwent an exothermic process. If the 20oC water is viewed as the system, it underwent an endothermic process.
Once the solution reaches equilibrium, the temperature change for the 50oC water is the same as the temperature change for the 20oC water. This is due to the fact that both substances were water and the mass of the 50oC water was the same as the mass of the 20oC water.
m1cp1deltaT1 = m2cp2deltaT2 ; since m1 = m2 and cp1 = cp2, therefore, deltaT1 = deltaT2
In the next part of the demonstration, 20.0 g of copper metal at 200oC is mixed with 100 g of water at 20oC. The copper lost heat while the water gained heat.
If the copper is viewed as the system, it has undergone an exothermic process. If the water is viewed as the system, it has undergone an endothermic process process.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.