In an Experiment to Measure the Thermal Conductivity of a Certain

question 43

Multiple Choice

In an experiment to measure the thermal conductivity of a certain material,a slab of material 10.0 mm thick separates a steam chamber from a block of ice with a square cross-section with dimensions 8.00 cm × 8.00 cm.After 5.00 min of running the experiment,64.0 g of ice have melted.What is the thermal conductivity of this material? The latent heat of fusion of water is 33.5 × 10⁴ J/kg,the latent heat of vaporization of water is 2.256 × 10⁶ J/kg,and both the ice and water are under 1.00 atm of pressure.

• A)0.130 W/m ∙ K
• B)0.250 W/m ∙ K
• C)0.440 W/m ∙ K
• D)0.620 W/m ∙ K
• E)1.12 W/m ∙ K

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Definitions:

Taq Polymerase

An enzyme derived from the bacterium Thermus aquaticus, used in PCR to amplify DNA sequences.

DNA Sequences

The order of nucleotides in a strand of DNA, which determines the genetic information carried by that DNA.

Gene Targeting

A genetic technique that uses homologous recombination to change an endogenous gene's sequence to study gene function or create specific animal models for human disease.

Knock-Out Gene

A gene that has been deliberately inactivated or deleted through genetic engineering to study its function by observing the resulting phenotype.