The correct option is C. A calorimeter is an isolated system. In isolated systems there is no exchange whatsoever with the surrounding. In an isolated system, an endothermic reaction results in a decrease in the temperature of the system. This is in contrast to the effect of an endothermic reaction in an open system. The heat of reaction remains a positive quantity.
Answer:
Hertz (I guess you can say love HERTZ)
Explanation:
The hertz (image: Hz) is the determined unit of recurrence in the International System of Units (SI) and is characterized as one cycle for every second. It is named after Heinrich Rudolf Hertz, the principal individual to give definitive evidence of the presence of electromagnetic waves.
Answer:
the solid materials will disappear after mixing with a liquid material
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Conduction
Explanation:
Stirring a pot with a metal spoon thereby making the spoon hot in the hand is a mode of heat transfer called conduction.
Heat is form of energy that causes differences in temperature between two bodies.
- There are three modes of heat transfer which are conduction, convection and radiation.
- Radiation is a form of heat transfer that does not involve a material medium.
- Convection is heat transfer in fluids that involves movement of the materials of the medium.
- Conduction is a mode of heat transfer in solids that involves movement of the materials of the medium.
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Answer 1
Correct Option: <span>A) The water received more energy than the alcohol.
Reason:
In the present case, the heating rate of both water and alcohol was same. So same amount of heat was supplied, at any given point of time. However, water took more time to reach the temperature of 50 oC. This clearly depicts that, more amount of heat was supplied to water, as compared to alcohol, to reach the desired temperature. It also suggest that, w</span>ater
takes longer to change its temperature than the alcohol<span>
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Answer 2:
Correct option: </span> For the same temperature change, water requires more energy<span>
Reason:
In the present case, time required for water to achieved the same temperature as that of alcohol, at a constant heating rate, was more. This suggest that f</span>or the same temperature change, water requires more energy. This can be attributed to the fact that, hydrogen bonding in water is more stronger than that in alcohol. Due to this, more amount of energy is required to overcome hydrogen-bonding in water.