QUESTION 1: A 200g sample of unknown, silvery metal at 48.9C is dropped into a c

Question

QUESTION 1:
A 200g sample of unknown, silvery metal at 48.9C is dropped into a calorimeter containing 230g of 17.0C water.

If the equilibrium temperature is 20.0?C, which material is the unknown likely to be?

QUESTION 2:

A mercury thermometer contains 1.95mL of liquid mercury at 0 ?C.

Part A

How much heat must it absorb in order to reach 85?C?

Express your answer to two significant figures and include the appropriate units.

Q= ?J

Explanation / Answer

Let specific heat of unknown metal by c:

SHC for water = 4187 J/KgC

Heat capacity of calorimeter is considered to be negligible.

Then:
0.200 x c x (48.9 - 20) = 0.23 x 4187 x (20 -17)
5.78 c = 2889.03
c = 499.832
Answer D. Steel

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