A Mixture of Salt and Ice Is Used to Chill

question 10

Multiple Choice

A mixture of salt and ice is used to chill the contents of old-fashioned, hand-operated ice cream makers. What is the melting point of a mixture of 1.00 lb of sodium chloride and 16.00 lb of ice if exactly half the ice melts? Assume ideal behavior and that all the sodium chloride dissolves in the melted ice water. K_f (water) = 1.86°C/m

• A) -8°C
• B) -11°C
• C) -12°C
• D) -21°C
• E) -15°C

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Definitions:

Formal Operational

The last phase of Piaget's cognitive development theory, marked by the capacity for abstract, logical, and systematic thought.

Development

The process of growth or progression through a sequence of physical, psychological, and emotional changes that occur in human beings from birth to the end of life.

Maturing Early

The phenomenon where an individual reaches physical and sexual maturity sooner than the average for their age group.

Myelin

A fatty substance that surrounds and insulates the axons of many neurons, enhancing the speed of electrical transmission between neurons.