An 920-G Piece of Iron at 100°C Is Dropped into a Calorimeter

question 54

Multiple Choice

An 920-g piece of iron at 100°C is dropped into a calorimeter of negligible heat capacity containing 50 g of ice at 0°C and 92 g of water,also at 0°C.What is the final temperature of the system? The specific heat of iron is 448 J/kg ∙ K,that of water is 4186 J/kg ∙ K,and the latent heat of fusion of water is 33.5 × 10⁴ J/kg.

• A)0°C
• B)11°C
• C)14°C
• D)24°C
• E)32°C

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Definitions:

Genetic Drift

A mechanism of evolution that involves random changes in the frequency of alleles within a population over time.

McDonald-Kreitman Test

A method used in molecular evolution to compare the ratio of non-synonymous to synonymous substitutions in a gene between species, assessing natural selection.

Homologous Gene

Genetic sequences that are shared by different species and have been inherited from a common ancestor.