Question

A    1.6-g sample of a metal that has the appearance of gold requires 5.8J of...

A    1.6-g sample of a metal that has the appearance of gold requires 5.8J of energy to change it’s temperature from 23C to 41 C. Is the metal pure gold?

B   If 294J of heat is transferred to a 10.0 g sample of silver at 25⁰C, what is the final temperature of the silver?

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Answer #1

(A)

The amount of heat energy (Q) required to change the temperature of a substance of mass m from initial temperature Ti to final temperature Tf is

where C is the specific heat of the substance.

Substituting given values

But the specific heat of gold is 0.129 J/(gC). Therefore, the metal is not pure gold.

(B)

Solving for Tf

The specific heat of silver is C=0.233 J/(gC). Substituting values

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