17 Questions
What is the internal energy of a substance composed of?
Total kinetic energy and total potential energy
How does the temperature of a body change when heat is imparted to it?
Temperature rises
What happens to the average kinetic energy of molecules in a substance when it is cooled?
Decreases
Why does heat flow from a body at higher temperature to a body at lower temperature when in contact?
To maintain equilibrium
How is heat defined in terms of the substance's energy?
Total internal energy
What is the unit of measurement for heat?
Joule
What happens to the temperature of a substance when there is a rise in the average kinetic energy of its molecules?
The temperature increases
In terms of specific heat capacities, what effect does different materials having different values have when heating them?
It requires more heat for materials with lower specific heat capacities
What major effect does heat have when changing the state of a substance?
Heat mainly produces a change of state in the substance
At what temperature does water exist as a solid?
0°C
What occurs when steam at 100°C condenses into water at 100°C?
The process is reversible
What is the common unit of heat mentioned in the text?
Calorie
What is the relationship between calories and Joules?
1 cal = 4.2 J
What happens to the average kinetic energy of molecules when a substance changes its state at a constant temperature?
It remains the same
What are molecules composed of?
Tiny particles called molecules
Which state of matter has the least potential energy and the greatest kinetic energy?
Gas
What happens to the motion of molecules when a substance absorbs heat and its temperature rises?
Molecular motion speeds up
Explore concepts related to heat, temperature, and changes in states of matter. Learn about the relationship between Joules and calories, the average kinetic energy of molecules, and the effects of heat on substances at a constant temperature.
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