A. if 0.96 kg of iron at 120°c is added to 0.75 kg of water at 20°c, what will be the final temperature of the system?

b. by touching the side of a beaker, a student concludes that an endothermic change is taking place inside it. write 2 - 3 sentences explaining how the student came to that conclusion and comparing the energy o the products of an endothermic reaction with the energy of the reactants.

c. as a substance freezes, its temperature does not change. how does the potential energy of the molecules of the substance change as a result of the heat released? what type of energy must decrease in order for the temperature to decrease?

PART A)

Heat released by iron = heat gain by water

now we have

PART B)

When endothermic changes takes place in the system then system absorbs the energy from its surrounding and keeps on cooling down

Due to this the observer will feel the cool down of the surface temperature and conclude that it is an endothermic reaction

PART C)

When a substance freezes its temperature do not change but if we will check the potential energy of molecules we can conclude that the system released its energy which is known as latent heat.

This will lead to the increase in its potential energy

And due to this decrease in latent heat the substance will freeze

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg

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