Two Experimental Runs Are Performed to Determine the Calorimetric Properties $- 10.0 ^ { \circ } \mathrm { C } .$

question 69

Multiple Choice

Two experimental runs are performed to determine the calorimetric properties of an alcohol which
has a melting point of $- 10.0 ^ { \circ } \mathrm { C } .$ In the first run, a 200-g cube of frozen alcohol, at the melting point,
is added to 300 g of water at $20.0 ^ { \circ } \mathrm { C }$ in a styrofoam container. When thermal equilibrium is
reached, the alcohol-water solution is at a temperature of $5.0 ^ { \circ } \mathrm { C }$ In the second run, an identical
cube of alcohol is added to 500 g of water at $20.0 ^ { \circ } \mathrm { C }$ and the temperature at thermal equilibrium is
$10.0 ^ { \circ } \mathrm { C }$ The specific heat capacity of water is $4190 \mathrm {~J} / \mathrm { kg } \cdot \mathrm { K } .$ Assume no heat is exchanged with the
styrofoam container and the surroundings. What is the heat of fusion of the alcohol?

• A)\(8.7 \times 10 ^ { 4 } \mathrm {~J} / \mathrm { kg }\)
• B) \(7.9 \times 10 ^ { 4 } \mathrm {~J} / \mathrm { kg }\)
• C) \(7.1 \times 10 ^ { 4 } \mathrm {~J} / \mathrm { kg }\)
• D) \(6.3 \times 10 ^ { 4 } \mathrm {~J} / \mathrm { kg }\)
• E) \(5.5 \times 10 ^ { 4 } \mathrm {~J} / \mathrm { kg }\)

Comprehend the asymmetry in brain function and the specialized roles of the left and right hemispheres.

Recognize the impact of genetics and environment on human development and behavior.

Grasp the fundamental concepts of neuroplasticity and its implications for recovery from brain injury.

Understand the structure and function of key brain regions and neural pathways involved in various cognitive functions.

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Definitions:

Cerebral Cortex

The outer layer of the cerebrum, involved in complex brain functions such as thought, memory, and sensory processing.

Effector

A part of the body, such as a muscle or gland, that becomes active in response to nerve impulses.

Integration Center

In physiology, refers to regions within the central nervous system that process and interpret sensory information to formulate a response.

Brachial Plexus

The brachial plexus is a network of nerves that originates from the spinal cord in the neck and travels down the arm, providing motor and sensory functions to the upper limb.