Question
Two systems in contact are in thermal equilibrium. This means that ____.
- They are at equal pressures
- They are at the same temperature
- They have the same number of moles
- They are of the same volume
Hint:
Thermal equilibrium is the state of a system in which all parts are at the same temperature.
The correct answer is: They are at the same temperature
Heat is the flow of energy from a high temperature to a low temperature. When these temperatures balance out, heat stops flowing, then the system (or set of systems) is said to be in thermal equilibrium. Thermal equilibrium also implies that there's no matter flowing into or out of the system.
Related Questions to study
Work is done on or by the particles of a gas system by _____.
Work is done on or by the particles of a gas system by _____.
_____ is a visible transfer of energy into or out of a system.
_____ is a visible transfer of energy into or out of a system.
The volume of the system does not change. Such a system is called ____.
The volume of the system does not change. Such a system is called ____.
The temperature of the system does not change. Such a system is called ________.
The temperature of the system does not change. Such a system is called ________.
A pot of water is heated, what happens at a molecular level?
A pot of water is heated, what happens at a molecular level?
743 J = ____ cal
743 J = ____ cal
847 cal = ___ kcal
847 cal = ___ kcal
625 cal = ____ J
Energy is the ability to do work which is measured in different units. Calorie and Joule are the units of energy which are proportionate to each other. This implies any change in the value of calories will change its equivalent value in joules. The relation between calorie and joule can be numerically written as : 1 calorie = 4.2 joules approx.
Hence, 625 cal= (625* 4.2)= 2,615 joules.
625 cal = ____ J
Energy is the ability to do work which is measured in different units. Calorie and Joule are the units of energy which are proportionate to each other. This implies any change in the value of calories will change its equivalent value in joules. The relation between calorie and joule can be numerically written as : 1 calorie = 4.2 joules approx.
Hence, 625 cal= (625* 4.2)= 2,615 joules.
25 kcal = ____cal
The kilo calorie is a measurement unit of energy. The symbol of kilo calorie is kcal.The kilocalorie is used in measuring the heating, calorific value or metabolizing foods. It equals to 1000 calories, or approximately 4.2 kilojoules. Therefore, 1 kcal= 1000 cal.
so, 25 kcal= (25*1000)= 25000 cal.
25 kcal = ____cal
The kilo calorie is a measurement unit of energy. The symbol of kilo calorie is kcal.The kilocalorie is used in measuring the heating, calorific value or metabolizing foods. It equals to 1000 calories, or approximately 4.2 kilojoules. Therefore, 1 kcal= 1000 cal.
so, 25 kcal= (25*1000)= 25000 cal.
When sufficient heat is supplied to an ice cube
When heat is applied to an ice molecule, the solid phase changes to the liquid phase and thus the ice is melted into water after applying heat. Heating a substance makes the molecules move faster and thus the heat energy breaks the hydrogen bonds that hold the molecules in the ice together thus resulting in melting of ice.
When sufficient heat is supplied to an ice cube
When heat is applied to an ice molecule, the solid phase changes to the liquid phase and thus the ice is melted into water after applying heat. Heating a substance makes the molecules move faster and thus the heat energy breaks the hydrogen bonds that hold the molecules in the ice together thus resulting in melting of ice.
Match the following:
| State | Flow of heat | ||
| a |  |
i | To the hand |
| b |  |
ii | From the hand |
| c |  |
iii | None |
Match the following:
| State | Flow of heat | ||
| a | |
i | To the hand |
| b | |
ii | From the hand |
| c | |
iii | None |
