How much heat, in calories, is given off when 1.25 grams of silver is cooled from 100.0°c to 80.0°c? (the specific heat of silver is 0.057 cal/g°c)
1.43 cal
0.0713 cal
5.70 cal
7.13 cal

The correct answer is 1.43 cal.

Explanation:

The expression of heat in terms of mass and temperature is as follows;

Here, Q is the heat, m is the mass of the object and is the change in temperature.

It is given in the problem that 1.25 grams of silver is cooled from 100.0°C to 80.0°C.

Calculate the change in temperature.

Calculate the heat in calories.

Put m= 1.25 grams,  and c=0.057 cal/g°C.

Q= 1.43 cal

Therefore, the amount of heat is  1.43 cal.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

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