Domanda del libro di testo
How many significant figures are in each of the following measurements? (a) 35.0445 g
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Ch.1 - Chemical Tools: Experimentation & Measurement
McMurry8th EditionChemistryISBN: 9781292336145
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TOC.tableOfContents
- Ch.1 - Chemical Tools: Experimentation & Measurement170
- Ch.2 - Atoms, Molecules & Ions160
- Ch.3 - Mass Relationships in Chemical Reactions169
- Ch.4 - Reactions in Aqueous Solution199
- Ch.5 - Periodicity & Electronic Structure of Atoms102
- Ch.6 - Ionic Compounds: Periodic Trends and Bonding Theory92
- Ch.7 - Covalent Bonding and Electron-Dot Structures61
- Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure59
- Ch.9 - Thermochemistry: Chemical Energy122
- Ch.10 - Gases: Their Properties & Behavior155
- Ch.11 - Liquids & Phase Changes54
- Ch.12 - Solids and Solid-State Materials73
- Ch.13 - Solutions & Their Properties120
- Ch.14 - Chemical Kinetics98
- Ch.15 - Chemical Equilibrium125
- Ch.16 - Aqueous Equilibria: Acids & Bases110
- Ch.17 - Applications of Aqueous Equilibria147
- Ch.18 - Thermodynamics: Entropy, Free Energy & Equilibrium86
- Ch.19 - Electrochemistry154
- Ch.20 - Nuclear Chemistry96
- Ch.21 - Transition Elements and Coordination Chemistry156
- Ch.22 - The Main Group Elements187
- Ch.23 - Organic and Biological Chemistry51
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McMurry 8th EditionCh.1 - Chemical Tools: Experimentation & MeasurementProblema 83
McMurry 8th EditionCh.1 - Chemical Tools: Experimentation & MeasurementProblema 83Capitolo 1, Problema 83
A 20 fluid oz. soda contains 238 Calories. (a) How many kilojoules does the soda contain? (b) For how many hours could the amount of energy in the soda light a 75-watt light bulb? (1 watt = 1 J/s)
Guida verificata passo dopo passo1
Step 1: Convert Calories to kilocalories. Since 1 Calorie (with an uppercase 'C') is equivalent to 1 kilocalorie (kcal), the soda contains 238 kcal.
Step 2: Convert kilocalories to kilojoules. Use the conversion factor: 1 kcal = 4.184 kJ. Multiply 238 kcal by 4.184 kJ/kcal to find the energy in kilojoules.
Step 3: Calculate the total energy in joules. Since 1 kJ = 1000 J, multiply the energy in kilojoules by 1000 to convert it to joules.
Step 4: Determine the energy consumption of a 75-watt light bulb. Since 1 watt = 1 J/s, a 75-watt bulb uses 75 J every second.
Step 5: Calculate the number of hours the light bulb can be powered. Divide the total energy in joules by the energy consumption rate of the bulb (75 J/s) to find the time in seconds, then convert seconds to hours by dividing by 3600 (the number of seconds in an hour).
Concetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Energy Conversion
Energy can be expressed in different units, such as calories and joules. To convert calories to joules, the conversion factor is 1 calorie = 4.184 joules. In this question, understanding how to convert the energy content of the soda from calories to kilojoules (1 kilojoule = 1000 joules) is essential for solving part (a).
Video consigliato:
Percorso guidato
01:56
Conversion Factors
Power and Energy Relationship
Power is defined as the rate at which energy is used or transferred, measured in watts (W), where 1 watt equals 1 joule per second (J/s). To determine how long the energy from the soda can power a light bulb, one must relate the total energy available (in joules) to the power consumption of the bulb. This relationship is crucial for solving part (b) of the question.
Video consigliato:
Percorso guidato
04:42Power and Root Functions Example
Unit Consistency
When performing calculations involving different units, it is vital to ensure that all units are consistent. In this problem, energy must be expressed in joules to match the power of the light bulb in watts. Maintaining unit consistency throughout the calculations will prevent errors and ensure accurate results.
Video consigliato:
Percorso guidato
02:13SI Units
Pratica correlata
Domanda del libro di testo
Which of the following statements uses exact numbers? (a) 1 ft = 12 in.
(b) 1 cal = 4.184 J
(c) The height of Mt. Everest is 29,035 ft.
(d) The world record for the 1-mile run, set by Morocco's Hicham el Guerrouj in July 1999, is 3 minutes, 43.13 seconds
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Domanda del libro di testo
What is the difference in mass between a nickel that weighs 4.8 g and a nickel that weighs 4.8673 g?
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Domanda del libro di testo
Assume that the kinetic energy of a 1400 kg car moving at 115 km/h (Problem 1.78) is converted entirely into heat. How many calories of heat are released, and what amount of water in liters could be heated from 20.0 °C to 50.0 °C by the car's energy? (One calorie raises the temperature of 1 mL of water by 1 °C)
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