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2.E: Atoms, Molecules, and Ions- Homework
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For Chapter 2 you MUST know:
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The names and symbols for elements 1-36
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Know the polyatomic Ions. You MUST know ammonium (\(\ce{NH4+}\)), acetate ( \(\ce{CH_3COO^-}\)), carbonate ( \(\ce{CO_3^{2-}}\)), hydroxide ( \(\ce{OH^-}\)), nitrate ( \(\ce{NO_3^-}\)), phosphate ( \(\ce{PO_4^{3-}}\)), and sulfate ( \(\ce{SO_4^{2-}}\)).
Turn in your answers for the following questions - show your work
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How many protons, neutrons and electrons are present in one atom of the following:
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1
H
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2
H
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3
H
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79
Br
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81
Br
1
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262
Bh
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What is the Atomic Weight of chlorine given that:
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The exact mass of
35
Cl is 34.9689 and the relative abundance is 75.53%
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The exact mass of
37
Cl is 36.9659 and the relative abundance is 24.47%
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Is this the answer that you expected?
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What is the Atomic Weight of ruthenium given the following information from WebElements, www.webelements.com. Is this the answer that you expected?
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Isotope Abundance Exact Mass
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96
Ru 5.54% 95.907599
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98
Ru 1.87% 97.905287
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99
Ru 12.76% 98.9059389
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100
Ru 12.60% 99.9042192
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101
Ru 17.06% 100.9055819
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102
Ru 31.55% 101.9043485
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104
Ru 18.62% 103.905424
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For the following molecules; write the chemical formula.
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carbon dioxide
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iron (II) chloride
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dinitrogen pentoxide
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iron (III) sulfate
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Name the following compounds.
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KI
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CaF
2
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Cu
2
SO
4
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N
2
O
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LiOH
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Give the chemical formula (or atomic symbol) and charge for the following ions:
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sulfate
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sulfite
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nitrate
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chloride
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nitride
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acetate
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carbonate
The Following Questions are for your practice - Do Not Turn In. They include answers so you can check your work
Atomic Structure and Symbolism
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Write the symbol for each of the following ions:
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the ion with a 1+ charge, atomic number 55, and mass number 133
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the ion with atomic number 15, mass number 31, and a 3− charge
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Answer A
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133
Cs
+
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Answer B
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31
P
3
−
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Give the number of protons, electrons, and neutrons in neutral atoms of each of the following isotopes:
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\(\ce{^7_3Li}\)
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\(\ce{^{125}_{52}Te}\)
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Answer A
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3 protons, 3 electrons, 4 neutrons
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Answer B
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52 protons, 52 electrons, 73 neutrons
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Write the molecular and empirical formulas of the following compounds:
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>
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Answer A
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molecular CO
2
, empirical CO
2
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Answer B
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molecular C
2
H
2
, empirical CH
The Periodic Table
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Using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main-group (representative) element, transition metal, or inner transition metal:
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uranium
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bromine
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gold
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americium
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Answer A
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metal, inner transition metal
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Answer B
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nonmetal, representative element
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Answer C
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metal, transition metal
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Answer D
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metal, inner transition metal
Molecular and Ionic Compounds
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Using the periodic table, predict whether the following chlorides are ionic or covalent: (a) KCl, (b) NCl
3
, (c) ICl, and (d) PCl
5
.
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Answer A
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ionic
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Answer B
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covalent
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Answer C
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covalent
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Answer D
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covalent
Chemical Nomenclature
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Name the following compounds:
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CsCl
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BaO
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K
2
S
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Answer A
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cesium chloride
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Answer B
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barium oxide
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Answer C
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potassium sulfide
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Write the formulas of the following compounds:
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rubidium bromide
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magnesium selenide
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calcium chloride
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Answer A
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RbBr
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Answer B
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MgSe
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Answer C
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CaCl
2
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Write the formulas of the following compounds
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chlorine dioxide
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dinitrogen tetraoxide
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potassium phosphide
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silver(I) sulfide
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Answer A
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ClO
2
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Answer B
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N
2
O
4
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Answer C
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K
3
P
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Answer D
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Ag
2
S
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Each of the following compounds contains a metal that can exhibit more than one ionic charge. Name these compounds:
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Cr
2
O
3
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FeCl
2
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CrO
3
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Answer A
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chromium(III) oxide
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Answer B
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iron(II) chloride
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Answer C
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chromium(VI) oxide