Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition) - Standalone book
12th Edition
ISBN: 9780321908445
Author: Karen C. Timberlake
Publisher: PEARSON
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Textbook Question
Chapter 3.4, Problem 3.25QAP
The energy needed to keep a 75-wattlight bulb burning for 1.0 h is 270 kJ. Calculate the energy required to keep the light bulb burning for 3.0 h in each of the following energy units:
a. joules
b. kilocalories
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Chapter 3 Solutions
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition) - Standalone book
Ch. 3.1 - Classify each of the following as a pure substance...Ch. 3.1 - Classify each of the following as a pure substance...Ch. 3.1 - Prob. 3.3QAPCh. 3.1 - Prob. 3.4QAPCh. 3.1 - Prob. 3.5QAPCh. 3.1 - Prob. 3.6QAPCh. 3.2 - Prob. 3.7QAPCh. 3.2 - Indicate whether each of the following describes a...Ch. 3.2 - Describe each of the following as a physical or...Ch. 3.2 - Describe each of the following as a physical or...
Ch. 3.2 - Prob. 3.11QAPCh. 3.2 - What type of change, physical or chemical, takes...Ch. 3.2 - Describe each property of the element fluorine as...Ch. 3.2 - Describe each property of the element zirconium as...Ch. 3.3 - Prob. 3.15QAPCh. 3.3 - Prob. 3.16QAPCh. 3.3 - Prob. 3.17QAPCh. 3.3 - Calculate the unknown temperature in each of the...Ch. 3.3 - Prob. 3.19QAPCh. 3.3 - a. Water is heated to 145 °F. What is the...Ch. 3.4 - Discuss the changes in the potential and kinetic...Ch. 3.4 - Prob. 3.22QAPCh. 3.4 - Indicate whether each of the following statements...Ch. 3.4 - Prob. 3.24QAPCh. 3.4 - The energy needed to keep a 75-wattlight bulb...Ch. 3.4 - Prob. 3.26QAPCh. 3.5 - Calculate the kilocalories for each of the...Ch. 3.5 - Calculate the kilocalories for each of the...Ch. 3.5 - Using the energy values for foods (see TABLE3.7),...Ch. 3.5 - Using the energy values for foods (see TABLE3.7),...Ch. 3.5 - Prob. 3.31QAPCh. 3.5 - Prob. 3.32QAPCh. 3.6 - If the same amount of heat is supplied to samples...Ch. 3.6 - Substances A and B are the same mass and at the...Ch. 3.6 - Prob. 3.35QAPCh. 3.6 - Prob. 3.36QAPCh. 3.6 - Use the heat equation to calculate the energy, in...Ch. 3.6 - Use the heat equation to calculate the energy, in...Ch. 3.7 - Identify each of the following changes of state as...Ch. 3.7 - Identify each of the following changes of state as...Ch. 3.7 - Calculate the heat change at 0 °C for each of the...Ch. 3.7 - Prob. 3.42QAPCh. 3.7 - Identify each of the following changes of state as...Ch. 3.7 - Identify each of the following changes of state as...Ch. 3.7 - Prob. 3.45QAPCh. 3.7 - 3.50 Calculate the heat change at 100 °C for each...Ch. 3.7 - Prob. 3.47QAPCh. 3.7 - Prob. 3.49QAPCh. 3.7 - Prob. 3.50QAPCh. 3 - Prob. 3.51UTCCh. 3 - Prob. 3.52UTCCh. 3 - Prob. 3.53UTCCh. 3 - Prob. 3.54UTCCh. 3 - Prob. 3.55UTCCh. 3 - Prob. 3.56UTCCh. 3 - Prob. 3.57UTCCh. 3 - Prob. 3.58UTCCh. 3 - Calculate the energy to heat two cubes (gold and...Ch. 3 - Calculate the energy to heat two cubes (silver and...Ch. 3 - Prob. 3.61UTCCh. 3 - Prob. 3.62UTCCh. 3 - Prob. 3.63AQAPCh. 3 - Prob. 3.64AQAPCh. 3 - Prob. 3.65AQAPCh. 3 - Prob. 3.66AQAPCh. 3 - Prob. 3.67AQAPCh. 3 - Prob. 3.68AQAPCh. 3 - Prob. 3.69AQAPCh. 3 - Prob. 3.70AQAPCh. 3 - Prob. 3.71AQAPCh. 3 - Prob. 3.72AQAPCh. 3 - Prob. 3.73AQAPCh. 3 - Calculate each of the following temperatures in...Ch. 3 - What is 15 °F in degrees Celsius and in kelvins?...Ch. 3 - Prob. 3.76AQAPCh. 3 - Prob. 3.77AQAPCh. 3 - Prob. 3.78AQAPCh. 3 - Prob. 3.79AQAPCh. 3 - On a hot sunny day, you get out of the swimming...Ch. 3 - Prob. 3.81AQAPCh. 3 - Prob. 3.82AQAPCh. 3 - A 0.50-g sample of vegetable oil is placed in a...Ch. 3 - A 1.3-g sample of rice is placed in a calorimeter....Ch. 3 - Prob. 3.85AQAPCh. 3 - Prob. 3.86AQAPCh. 3 - The melting point of dibromomethane is 53 °C and...Ch. 3 - Prob. 3.88AQAPCh. 3 - Prob. 3.89CQCh. 3 - A 45-g piece of ice at 0.0 °C is added to a sample...Ch. 3 - Prob. 3.91CQCh. 3 - Prob. 3.92CQCh. 3 - Prob. 3.93CQCh. 3 - A 115-g sample of steam at 100 °C is emitted from...Ch. 3 - Prob. 1CICh. 3 - Prob. 2CICh. 3 - Answer the following for water samples A and B...Ch. 3 - Prob. 4CICh. 3 - Prob. 5CICh. 3 - Prob. 6CI
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- 9.15 Carry out the following conversions of energy units: (a) 14.3 Btu Into calories, (b) 1.4105 cal into joules, (c) 31.6 mJ into Btuarrow_forwardThe initial temperature of a 344-g sample of iron is 18.2 C. If the sample absorbs 2.25 kJ of energy as heat, what is its final temperature?arrow_forwardHydrogen is an ideal fuel in many respects; for example, the product of its combustion, water, is nonpolluting. The heat given off in burning hydrogen to gaseous water is 5.16 104 Btu per pound. What is this heat energy in joules per gram? (1 Btu = 252 cal; see also Table 1.4.)arrow_forward
- 9.30 For the example of shallow water and sandy beaches, which material has a larger heat capacity or specific heat? How does a hot day at the beach provide evidence for your answer?arrow_forwardSmall amounts of oxygen gas can be prepared in the laboratory by decomposing potassium chlorate with heat. A by-product of the decomposition is potassium chloride. When one mole of potassium chlorate decomposes, 44.7 kJ are evolved. (a) Write a balanced thermochemical equation for the decomposition of one mole of potassium chlorate. (b) Is the reaction exothermic? (c) Draw an energy diagram showing the path of this reaction. (Figure 8.6 is an example of such an energy diagram.) (d) What is H when 3.00 g of potassium chlorate decompose? (e) How many grams of potassium chlorate need to be decomposed to liberate fifteen kilojoules of heat?arrow_forwardA system releases 125 kJ of heal while 104 kJ of work is done on it. Calculate E.arrow_forward
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- Which is the least expensive source of energy in kilojoules per dollar: a box of breakfast cereal that weighs 32 ounces and costs $4.23, or a liter of isooctane (density, 0.69 19 g/mL) that costs $0.45? Compare the nutritional value of the cereal with the heat produced by combustion of the isooctane under standard conditions. A 1.0-ounce serving of the cereal provides 130 Calories.arrow_forwardAn iron skillet weighing 1.63 kg is heated on a stove to 178C. Suppose the skillet is cooled to room temperature, 21C. How much heat energy (in joules) must be removed to affect this cooling? The specific heat of iron is 0.449 J/(gC).arrow_forwardOne beaker contains 156 g of water at 22 C, and a second beaker contains 85.2 g of water at 95 C. The water in the two beakers is mixed. What is the final water temperature?arrow_forward
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