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Chemistry: The Molecular Science

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter1: The Nature Of Chemistry

Section: Chapter Questions

Problem 101QRT

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Question

A hypothetical metal has a theoretical density of 11.89 g/cm3. This metal adopts a cubic crystal structure with an edge length of 0.387 nm and atomic radius of
0.137 nm. Find the atomic weight of this metal in g/mol. NA = 6.022 x 1023 atoms/mol. Express your answer in two decimal places only. Do not put the units.

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Some hypothetical metal has a simple cubic crystal structure. If its atomic weight is 68.73 g/mol and the atomic radius in atomic radius is 0.153 nm, calculate its theoretical density in g/cm3. NA = 6.022 x 1023 atoms/mol. Express your answer in two decimal places only. Do not put the units.
Some hypothetical metal has simple cubic crystal structure. If its atomic weight is 68.21 g/mol and the atomic radius in atomic radius is 0.101 nm, calculate its theoretical density in g/cm3. = 6.022 x 1023 atoms/mo. Express NA your answer in two decimal places only. Do not put the units.
Some hypothetical metal has simple cubic crystal structure. If its atomic weight is 61.25 g/mol and the atomic radius in atomic radius is 0.174 nm, calculate its theoretical density in g/cm3. NA = 6.022 x 1023 atoms/mol.
A mole of a newly discovered crystalline substance weighs 14.56 grams and displaces 2.3 mL of water. What is the density of the crystal? Find the atomic radius and density of each atom if it is a simple cubic cell? BCC? FCC? HCP? *Use 4 decimal places
PbO2(s)+HCl(aq)→Cl2(g)+PbCl2(aq)+H2O(l)PbO2(s)+HCl(aq)→Cl2(g)+PbCl2(aq)+H2O(l) Express your answer as a chemical equation. Identify all of the phases in your answer. Balance each chemical equation.
A white substance melts at 70 degrees Celsius. As a solid or in aqueous form it does not conduct electricity and can be easily crushed . What type of solid is this substance likely to be ? Justify your answer .
Observe granules of sugar, salt, and pepper under a magnifying glass. Can you see the difference between the sugar and salt granules? Can you see the different angles? Are there angles in the pepper? Does it look crystalline? Which of the substances appears to be made of crystals? What did you use to help you decide which are crystals, and which are not? Defend your answer with evidence from your observation.
In Parts 1 and 2, you noticed some patterns about what kind of substances conduct electricity when dissolved in water, and also how melting points are related. Let's test this pattern by applying it to other substances. Consider the following substances: • Potassium Chloride: KCI • Octadecanol: C18 H380 • Dimethyl Sulfoxide: C2 H6OS • Lithium Bromide: LiBr 1. Based on the patterns you saw in the previous sections, which of those substances do you think will conduct electricity when dissolved in water? Select all that apply: Lithium Bromide Dimethyl Sulfoxide Octadecanol Potassium Chloride
Calculate the number of atoms in 264. µg of cadmium. Be sure your answer has the correct number of significant figures. Note: Reference the SI prefixes and Fundamental constants table for additional information. Cd atoms 0 x10 X
The noble gas argon was discovered by Sir Walter Ramsay and John William Strutt in England in 1895. Through this discovery, they made highly accurate measurements of gas densities. Their experimentally determined densities are: Oxygen 1.42952 g/L Nitrogen 1.25718 g/L Air 1.29327 g/L 1) To determine the density of atmospheric nitrogen, Strutt removed the oxygen, water, carbon dioxide, and argon from air and then filled an evacuated glass tube with the remaining gas. He determined that a mass of 0.20389 g of nitrogen has a density of 1.25718 g/L under standard conditions of temperature and pressure. What is the volume of the glass tube in cm3?
What is the boiling point of water at an elevation of 1.15x10^4 ft? Use three significant figures.
Calculate the radius in nanometers of a metallic atom given that it has a BCC structure and a density of 12.81 g/cm3 and an atomic weight of 110.9 g/mol. NA = 6.022 x 1023 atoms/mol. Express your answer in three decimal places only. Do not put the units. Add your answer

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