Part I. True or False 1. Solids, liquids, or gases are composed of atoms or mole

Question

Part I. True or False 1. Solids, liquids, or gases are composed of atoms or molecules 2. An object floats in water if it has an average density more than that of water. 3. Heat is energy that flows from one object to another when there is a difference in temperature between the objects. Calorie is the unit of heat: 1 calorie is the amount of heat required to raise the temperature of 1 cm3 of water by 1 . 4. 5. Heat exchange between two objects in isolated systems: the amount of heat gained by object B is equal to the amount of heat lost by object A

Explanation / Answer

1. TRUE. All matters are composed of atoms and molecules, and as solid liquid and gases are types of matter, the statement holds true for the mas well.

2. False, The object would float if the density is less than water, and would submerge when its density is higher.

3. TRUE. Heat energy is directly associated with the temperature. and only when there is a difference in temperature, the heat energy will flow from one body to another. If both are at same temperature, there will be a equilibrium and no heat exchange would take place.

4.FALSE. Calorie is the heat required to increase the temperature of unit mass (gram) by unit temperature (deg C)

5. TRUE. Since, the system is kept isloated, no amount of heat can be dissipated into the environment. and the heat exchange can be done within the two objects only. Hence, the heat lost by one will be equal to heat accepted by other body.

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