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Ch.3 Matter and Energy
Timberlake - Chemistry: An Introduction to General, Organic, and Biological Chemistry 14th Edition
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249Not the one you use?Change textbook
All textbooksTimberlake 14th EditionCh.3 Matter and EnergyProblem 46a
Chapter 3, Problem 46a

Identify each of the following changes of state as melting, freezing, sublimation, or deposition:
b. Snow on the ground turns to liquid water.

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Identify the initial state of the substance: In this case, snow is in the solid state (ice).
Identify the final state of the substance: The snow turns into liquid water, so the final state is liquid.
Determine the process that describes the change from solid to liquid: The transition from a solid to a liquid is called melting.
Recall that melting occurs when a substance absorbs heat energy, causing its particles to overcome the rigid structure of the solid and move more freely as a liquid.
Conclude that the change of state described in the problem is melting.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Melting

Melting is the process where a solid turns into a liquid due to an increase in temperature. This occurs when the particles in a solid gain enough energy to overcome the forces holding them together, allowing them to move freely as a liquid. In the context of the question, snow, which is solid ice, melts into liquid water as it warms.
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Freezing

Freezing is the reverse process of melting, where a liquid turns into a solid as its temperature decreases. During freezing, the particles in a liquid lose energy and come together to form a solid structure. This concept is important to understand the phase changes of water, but it is not applicable to the scenario described in the question.
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Phase Change

A phase change refers to the transition of a substance from one state of matter to another, such as solid, liquid, or gas. These changes are driven by temperature and pressure variations, affecting the energy and arrangement of particles. In the question, the transition of snow (solid) to water (liquid) exemplifies a phase change, specifically melting.
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Related Practice
Textbook Question

Identify each of the following changes of state as melting, freezing, sublimation, or deposition:

c. Heat is removed from 125 g of liquid water at 0 °C.

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Textbook Question

Identify each of the following changes of state as melting, freezing, sublimation, or deposition:

d. Frost (ice) forms on the walls of a freezer unit of a refrigerator.

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Textbook Question

Identify each of the following changes of state as melting, freezing, sublimation, or deposition:

a. Dry ice in an ice-cream cart disappears.

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Textbook Question

Using the energy values for foods (see TABLE 3.7), determine each of the following (round off the answer for each food type to the tens place):

a. the total kilojoules in two tablespoons of crunchy peanut butter that contains 6 g of carbohydrate, 16 g of fat, and 7 g of protein

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Textbook Question

For dinner, Charles had one cup of clam chowder, which contains 16 g of carbohydrate, 12 g of fat, and 9 g of protein. How much energy, in kilocalories and kilojoules, is in the clam chowder? (Round off the answer for each food type to the tens place.)

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Textbook Question

A patient receives 3.2 L of intravenous (IV) glucose solution. If 100. mL of the solution contains 5.0 g of glucose (carbohydrate), how many kilocalories did the patient obtain from the glucose solution?

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