Mastering Chemistry with Pearson eText -- Standalone Access Card -- for Introductory Chemistry (6th Edition)
6th Edition
ISBN: 9780134565927
Author: Nivaldo J. Tro
Publisher: PEARSON
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Chapter 12, Problem 37E
Interpretation Introduction
Interpretation:
When acetone and water poured on hand, the substance which produce a cooling effect after evaporation is to be identified and explained with a suitable reason.
Concept Introduction:
In evaporation or vaporization, a substance is converted from liquid state into a gaseous state. Liquids that evaporate easily are volatile, whereas those that do not vaporize easily are non-volatile.
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4. What is the heat of vaporization, in calories per gram, for water at 20°C?
There are three sets of sketches below, showing the same pure molecular compound (water, molecular formula H2O) at three different temperatures. The
sketches are drawn as if a sample of water were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct.
Use the slider to choose the correct sketch in each set. You may need the following information:
melting point of H₂O: 0.0 °C
boiling point of H₂O: 100.0 °C
B
C
(Choose one) (Choose one) (Choose one)
1 2 3 4
3 4
5
1
2
3
4
5
1
I
|
35. °C
269. °C
-22.°C
There are three sets of sketches below, showing the same pure molecular compound (water, molecular formula H₂O) at three different temperatures. The
sketches are drawn as if a sample of water were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct.
Use the slider to choose the correct sketch in each set. You may need the following information:
melting point of H₂O: 0.0 °C
boiling point of H₂O: 100.0 °C
A
(Choose one) (Choose one)
188. °C
B
5
35. °C
4 5
(Choose one)
-25. °℃
Chapter 12 Solutions
Mastering Chemistry with Pearson eText -- Standalone Access Card -- for Introductory Chemistry (6th Edition)
Ch. 12 - The first diagram shown here represents liquid...Ch. 12 - Prob. 2SAQCh. 12 - Prob. 3SAQCh. 12 - How many 20.0-g ice cubes are required to absorb...Ch. 12 - Prob. 5SAQCh. 12 - Prob. 6SAQCh. 12 - Prob. 7SAQCh. 12 - Prob. 8SAQCh. 12 - Prob. 9SAQCh. 12 - Prob. 10SAQ
Ch. 12 - Prob. 1ECh. 12 - Prob. 2ECh. 12 - What determines whether a substance is a solid,...Ch. 12 - 4. What are the properties of liquids? Explain the...Ch. 12 - 5. What are the properties of solids? Explain the...Ch. 12 - Prob. 6ECh. 12 - Prob. 7ECh. 12 - Prob. 8ECh. 12 - Prob. 9ECh. 12 - Why does a glass of water evaporate more slowly in...Ch. 12 - Prob. 11ECh. 12 - Prob. 12ECh. 12 - 13. Acetone evaporates more quickly than water at...Ch. 12 - Prob. 14ECh. 12 - Prob. 15ECh. 12 - Prob. 16ECh. 12 - 17. Explain why a steam burn from gaseous water at...Ch. 12 - Prob. 18ECh. 12 - Prob. 19ECh. 12 - Prob. 20ECh. 12 - Is the melting of ice endothermic or exothermic?...Ch. 12 - 22. Is the boiling of water endothermic or...Ch. 12 - Prob. 23ECh. 12 - Prob. 24ECh. 12 - 25. What is hydrogen bonding? How can you tell...Ch. 12 - Prob. 26ECh. 12 - Prob. 27ECh. 12 - Prob. 28ECh. 12 - Prob. 29ECh. 12 - Prob. 30ECh. 12 - Prob. 31ECh. 12 - 32. What is an atomic solid? What are the...Ch. 12 - Prob. 33ECh. 12 - Prob. 34ECh. 12 - Prob. 35ECh. 12 - Two samples of pure water of equal volume are put...Ch. 12 - Prob. 37ECh. 12 - Spilling water over your skin on a hot day will...Ch. 12 - Prob. 39ECh. 12 - Water is put into a beaker and heated with a...Ch. 12 - 41. Which causes a more severe burn: spilling 0.50...Ch. 12 - 42. The nightly winter temperature drop in a...Ch. 12 - Prob. 43ECh. 12 - Prob. 44ECh. 12 - 45. An ice chest is filled with 3.5 kg of ice at...Ch. 12 - Why does 50 g of water initially at 0 C warm more...Ch. 12 - In Denver, Colorado, water boils at 95. C....Ch. 12 - Prob. 48ECh. 12 - 49. How much heat is required to vaporize 33.8 g...Ch. 12 - How much heat is required to vaporize 43.9 g of...Ch. 12 - How much heat does your body lose when 2.8 g of...Ch. 12 - How much heat does your body lose when 4.86 g of...Ch. 12 - How much heat is emitted when 4.25 g of water...Ch. 12 - Prob. 54ECh. 12 - 55. The human body obtains 835 kJ of energy from a...Ch. 12 - 56. The human body obtains 1078 kJ from a candy...Ch. 12 - How much heat is required to melt 37.4 g of ice at...Ch. 12 - 58. How much heat is required to melt 23.9 g of...Ch. 12 - How much energy is released when 34.2 g of water...Ch. 12 - How much energy is released when 2.55 kg of...Ch. 12 - 61. How much heat is required to convert 2.55 g of...Ch. 12 - 62. How much heat is required to convert 5.88 g of...Ch. 12 - Prob. 63ECh. 12 - Prob. 64ECh. 12 - 65. What kinds of intermolecular forces are...Ch. 12 - Prob. 66ECh. 12 - Prob. 67ECh. 12 - What kinds of intermolecular forces are present in...Ch. 12 - Which substance has the highest boiling point?...Ch. 12 - Prob. 70ECh. 12 - One of these two substances is a liquid at room...Ch. 12 - Prob. 72ECh. 12 - 73. A flask containing a mixture of and is...Ch. 12 - 74. Explain why is a liquid at room temperature...Ch. 12 - Are CH3CH2CH2CH2CH3 and H2O miscible?Ch. 12 - Prob. 76ECh. 12 - Prob. 77ECh. 12 - 78. Determine whether a homogeneous solution forms...Ch. 12 - 79. Identify each solid as molecular, ionic, or...Ch. 12 - Prob. 80ECh. 12 - Identify each solid as molecular, ionic, or...Ch. 12 - Identify each solid as molecular, ionic, or...Ch. 12 - 83. Which solid has the highest melting point?...Ch. 12 - 84. Which solid has the highest melting point?...Ch. 12 - 85. For each pair of solids, determine which solid...Ch. 12 - For each pair of solids, determine which solid has...Ch. 12 - 87. List these substances in order of increasing...Ch. 12 - 88. List these substances in order of decreasing...Ch. 12 - 89. Ice actually has negative caloric content. How...Ch. 12 - Prob. 90ECh. 12 - An 8.5-g ice cube is placed into 255 g of water....Ch. 12 - A 14.7-g ice cube is placed into 324 g of water....Ch. 12 - 93. How much ice in grams would have to melt to...Ch. 12 - Prob. 94ECh. 12 - Prob. 95ECh. 12 - Prob. 96ECh. 12 - Draw a Lewis structure for each molecule and...Ch. 12 - Draw a Lewis structure for each molecule and...Ch. 12 - 99. The melting point of ionic solids depends on...Ch. 12 - Draw ionic Lewis structures for KF and CaO. Use...Ch. 12 - Prob. 101ECh. 12 - Prob. 102ECh. 12 - An ice cube at 0.00 C with a mass of 23.5 g is...Ch. 12 - Prob. 104ECh. 12 - Prob. 105ECh. 12 - Prob. 106ECh. 12 - Prob. 107ECh. 12 - Prob. 108ECh. 12 - Prob. 109QGWCh. 12 - Prob. 110QGWCh. 12 - Prob. 111QGWCh. 12 - Prob. 112QGWCh. 12 - Prob. 113DIA
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- The enthalpy of vaporization of water is larger than its enthalpy of fusion. Explain why.arrow_forwardWill a closed container of water at 70 C or an open container of water at the same temperature cool faster on a cold winter day? Explain why.arrow_forwardWhat is U when 1.00 mol of liquid water vaporizes at 100C? The heat of vaporization, Hvap, of water at 100C is 40.66 kJ/mol.arrow_forward
- Why are steam burns so much worse than water burns even if the H2O is at the same temperature for both phases? Hint: Consider the heat of vaporization of water.arrow_forwardExplain why evaporation leads to cooling of the liquid.arrow_forwardAre changes in state physical or chemical changes? Explain. What type of forces must be overcome to melt or vaporize a substance (are these forces intramolecular or intermolecular)? Define the molar heat of fusion and molar heat of vaporization. Why is the molar heat of vaporization of water so much larger than its molar heat of fusion? Why does the boiling point of a liquid vary with altitude?arrow_forward
- In the northern United States, summer cottages are usually closed up for the winter. When doing so, the owners winterize the plumbing by putting antifreeze in the toilet tanks, for example. Will adding 525 g of HOCH2CH2OH to 3.00 kg of water ensure that the water will not freeze at 25 C?arrow_forwardSpilling room-temperature water over your skin on a hot day cools you down. Spilling room-temperature vegetable oil over your skin on a hot day does not. Explain the difference.arrow_forward(a) Consider a substance where the intermolecular forces hold the molecules in fixed rigid positions. What is the process called when enough heat has been added to the substance so that the molecules begin to flow? (b) Consider a substance where the intermolecular forces hold the molecules in close contact with each other, but the molecules can flow. What is the process called when enough heat has been added to the substance so that the molecules escape each other? (c) Consider a substance where the intermolecular forces hold the molecules in fixed rigid positions. What is the process called when enough heat has been added to the substance so that the molecules can escape each other?arrow_forward
- 4. Container A has 30 grams of water at 85 deg. C. Container B has 25 grams of water at 25 deg C. What is the final temperature when these two solutions are mixed? How much energy would exchange with the surroundings when this new solution (from part a) is fully vaporized?arrow_forward22) Evaporation of sweat requires energy and thus take excess heat away from the body. Some of the water that you drink may eventually be converted into sweat and evaporate. If you drink a 20-ounce bottle of water (590g) that had been in the refrigerator at 3.8 °C, how much heat is needed to convert all of that water into sweat and then to vapor? (Note: Your body temperature is 36.6 °C. For the purpose of solving this problem, assume that the therm properties of sweat are the same as for water. Us, liquid water = 4.184 J/g °C Cs, steam= 1.84 J/g °C C3, ice = 2.09 /g °C AHvap = 40.67 kJ/mol at 36.6 °C. %3D A Hus = 6.01 kJ/mol A) 1420 kJ B) 81 kJ C) 1150 kJ 23) Based on the graph shown below, choose the correct statement about sublimation? Gas Liquid sublimation Solid A) Sublimation is a phase transition from solid to gas B) According to Hess Law, AHsub can be calculated as sum of AHvap and AHUS C) Both A and B are correctarrow_forward. A cooling bath is prepared in a laboratory by mixingchunks of solid CO2 with ethanol. CO2(s) sublimes at-78.5°C to CO2(g). Ethanol freezes at -114.5°C andboils at 178.4°C. State the temperature of this coolingbath and describe what will be seen when it is preparedunder ordinary laboratory conditions.arrow_forward
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