Domanda del libro di testo
Answer the following questions. (c) A certain type of wood has a density of 0.40 g/cm3. What is the mass of 1.0 cord of this wood in kg, where 1 cord is 128 cubic feet of wood?
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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 110
McMurry 8th EditionCh.1 - Chemical Tools: Experimentation & MeasurementProblema 110Capitolo 1, Problema 110
Lignum vitae is a hard, durable, and extremely dense wood used to make ship bearings. A sphere of this wood with a diameter of 7.60 cm has a mass of 313 g. (a) What is the density of the lignum vitae sphere? (b) Will the sphere float or sink in water? (c) Will the sphere float or sink in chloroform? (The density of chloroform is 1.48 g/mL.)
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b>(a) Calculate the density of the lignum vitae sphere:
1. Use the formula for the volume of a sphere: \( V = \frac{4}{3} \pi r^3 \), where \( r \) is the radius of the sphere.
2. Convert the diameter to radius by dividing by 2: \( r = \frac{7.60 \text{ cm}}{2} \).
3. Substitute the radius into the volume formula to find the volume in cubic centimeters (cm³).
4. Use the density formula: \( \text{Density} = \frac{\text{mass}}{\text{volume}} \), where the mass is given as 313 g.
b>(b) Determine if the sphere will float or sink in water:
1. Recall that the density of water is approximately 1.00 g/mL (or 1.00 g/cm³).
2. Compare the density of the lignum vitae sphere to the density of water.
3. If the density of the sphere is greater than that of water, it will sink; if less, it will float.
b>(c) Determine if the sphere will float or sink in chloroform:
1. Use the given density of chloroform: 1.48 g/mL.
2. Compare the density of the lignum vitae sphere to the density of chloroform.
3. If the density of the sphere is greater than that of chloroform, it will sink; if less, it will float.
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Density
Density is defined as mass per unit volume, typically expressed in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³). It is a crucial property that helps determine whether an object will float or sink in a fluid. The formula for density is D = m/V, where D is density, m is mass, and V is volume. Understanding how to calculate density is essential for solving the problem regarding the lignum vitae sphere.
Video consigliato:
Percorso guidato
01:56
Density Concepts
Buoyancy
Buoyancy refers to the ability of an object to float in a fluid, which is determined by the relationship between the object's density and the density of the fluid. An object will float if its density is less than that of the fluid and sink if its density is greater. This principle is governed by Archimedes' principle, which states that the upward buoyant force on an object is equal to the weight of the fluid displaced by the object. Understanding buoyancy is key to answering whether the sphere will float or sink in water and chloroform.
Volume of a Sphere
The volume of a sphere can be calculated using the formula V = (4/3)πr³, where r is the radius of the sphere. This calculation is necessary to determine the volume of the lignum vitae sphere, which is essential for calculating its density. Knowing how to derive the volume from the diameter is important for solving part (a) of the question, as it directly impacts the density calculation.
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Percorso guidato
02:35Constant-Volume Calorimetry
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