Domanda del libro di testo
(c) Is a graduated cylinder such as that shown in Figure 1.21 likely to afford the accuracy of measurement needed?
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Ch.1 - Introduction: Matter, Energy, and Measurement
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
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Brown 14th EditionCh.1 - Introduction: Matter, Energy, and MeasurementProblema 38a
Brown 14th EditionCh.1 - Introduction: Matter, Energy, and MeasurementProblema 38aCapitolo 1, Problema 38a
(a) After the label fell off a bottle containing a clear liquid believed to be benzene, a chemist measured the density of the liquid to verify its identity. A 25.0-mL portion of the liquid had a mass of 21.95 g. A chemistry handbook lists the density of benzene at 15 °C as 0.8787 g/mL. Is the calculated density in agreement with the tabulated value?
Guida verificata passo dopo passo1
Calculate the density of the liquid using the formula: \( \text{Density} = \frac{\text{Mass}}{\text{Volume}} \).
Substitute the given values into the formula: Mass = 21.95 g and Volume = 25.0 mL.
Perform the division to find the density of the liquid in g/mL.
Compare the calculated density with the tabulated density of benzene, which is 0.8787 g/mL.
Determine if the calculated density is close enough to the tabulated value to confirm the identity of the liquid as benzene.
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Density
Density is defined as the mass of a substance divided by its volume, typically expressed in grams per milliliter (g/mL) for liquids. It is a physical property that can help identify substances, as different materials have characteristic densities. In this case, the density of the liquid is calculated to determine if it matches the known density of benzene.
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Percorso guidato
01:56
Density Concepts
Measurement and Calculation
Accurate measurement is crucial in chemistry, as it directly affects the results of calculations. In this scenario, the chemist measures the mass of the liquid and its volume to compute the density. The formula used is density = mass/volume, where mass is given in grams and volume in milliliters, leading to a calculated density that can be compared to the standard value.
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02:52Units of Radiation Measurement
Comparison with Standard Values
Comparing calculated values with standard or tabulated values is a common practice in chemistry to verify the identity of substances. In this case, the calculated density of the liquid is compared to the known density of benzene at a specific temperature. If the values are close, it suggests that the liquid is likely benzene; significant differences may indicate a different substance.
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01:10Standard Reduction Potentials
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Domanda del libro di testo
(c) A spherical ball of lead has a diameter of 5.0 cm. What is the mass of the sphere if lead has a density of 11.34 g>cm3? (The volume of a sphere is 14>32pr3, where r is the radius.)
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Domanda del libro di testo
If on a certain year, an estimated amount of 4 million metric
tons (1 metric ton = 1000 kg) of nitrous oxide 1N2O2 was
emitted worldwide due to agricultural activities, express this
mass of N2O in grams without exponential notation, using
an appropriate metric prefix.
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Domanda del libro di testo
(d) A cubic piece of metal measures 5.00 cm on each edge. If the metal is nickel, whose density is 8.90 g/cm3, what is the mass of the cube?
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1
rank
Domanda del libro di testo
(b) An experiment requires 45.0 g of ethylene glycol, a liquid whose density is 1.114 g/mL. Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
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Domanda del libro di testo
(b) An experiment requires 15.0 g of cyclohexane, whose density at 25 C is 0.7781 g>mL. What volume of cyclohexane should be used?
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