Domanda del libro di testo
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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Ch.3 Matter and Energy
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249
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TOC.tableOfContents
- Ch.1 Chemistry in Our Lives19
- Ch.2 Chemistry and Measurements80
- Ch.3 Matter and Energy53
- Ch.4 Atoms and Elements58
- Ch.5 Nuclear Chemistry42
- Ch.6 Ionic and Molecular Compounds57
- Ch.7 Chemical Quantities and Reactions38
- Ch.8 Gases30
- Ch.9 Solutions50
- Ch.10 Acids and Bases and Equilibrium64
- Ch.11 Introduction to Organic Chemistry: Hydrocarbons77
- Ch.12 Alcohols, Thiols, Ethers, Aldehydes, and Ketones82
- Ch.13 Carbohydrates54
- Ch.14 Carboxylic Acids, Esters, Amines, and Amides91
- Ch.15 Lipids61
- Ch.16 Amino Acids, Proteins, and Enzymes84
- Ch.17 Nucleic Acids and Protein Synthesis86
- Ch.18 Metabolic Pathways and ATP Production73
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249Non è quello che usi tu?Cambia libro di testo
Capitolo 3, Problema 46b
Identify each of the following changes of state as melting, freezing, sublimation, or deposition:
a. Dry ice in an ice-cream cart disappears.
Guida verificata passo dopo passo1
Step 1: Understand the process of sublimation. Sublimation is the change of state where a substance transitions directly from a solid to a gas without passing through the liquid phase.
Step 2: Recognize the properties of dry ice. Dry ice is solid carbon dioxide (CO₂), which sublimates at standard atmospheric pressure, meaning it transitions directly from a solid to a gas.
Step 3: Analyze the scenario. The problem states that dry ice 'disappears' in the ice-cream cart. This indicates that the solid dry ice is converting into a gas, as it does not leave behind any liquid residue.
Step 4: Match the observed change of state to the correct term. Since the solid is directly converting to a gas, this process is identified as sublimation.
Step 5: Conclude that the change of state described in the problem is sublimation, based on the properties of dry ice and the definition of sublimation.
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Sublimation
Sublimation is the process where a solid transitions directly into a gas without passing through the liquid state. This occurs when the molecules in the solid gain enough energy to overcome intermolecular forces, allowing them to escape into the air as gas. A common example is dry ice (solid carbon dioxide), which sublimates at room temperature, making it ideal for creating fog effects.
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Percorso guidato
01:23
Endothermic & Exothermic Reactions Example 2
Phase Changes
Phase changes refer to the transformations between different states of matter: solid, liquid, and gas. These changes occur due to variations in temperature and pressure, affecting the energy and arrangement of particles. Understanding these transitions is crucial for identifying processes like melting, freezing, sublimation, and deposition, which describe how substances change from one state to another.
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03:40Physical & Chemical Changes
Dry Ice
Dry ice is the solid form of carbon dioxide (CO2) and is commonly used as a refrigerant. It sublimates at -78.5 degrees Celsius, meaning it changes directly from solid to gas without becoming liquid. This property makes dry ice useful in various applications, including food preservation and theatrical effects, as seen in the example of it disappearing in an ice-cream cart.
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Percorso guidato
01:23Endothermic & Exothermic Reactions Example 2
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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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Domanda del libro di testo
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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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Domanda del libro di testo
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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