A Machine Part Consists of 0

question 36

Multiple Choice

A machine part consists of 0.10 kg of iron (of specific heat 470 J/kg ∙ K ) and 0.16 kg of copper (of specific heat 390 J/kg ∙ K) .How much heat must be added to the gear to raise its temperature from 18°C to 53°C?

• A)910 J
• B)3800 J
• C)4000 J
• D)4400 J

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Definitions:

Oxidation

Oxidation is a chemical reaction involving the loss of electrons by an atom, molecule, or ion.

Oxidation Number

A number assigned to an element in chemical combination which represents the number of electrons lost or gained by an atom of that element in the compound.

Compound

A substance made up of atoms of two or more different elements chemically bonded together.

Oxidation Number

A number that represents the total number of electrons an atom either gains or loses in order to form a chemical bond with another atom.