CHEM 110 Homework 2
Which one element forms the backbone of nearly all common polymers? What
other elements are also found in common household polymers?
Which isotope in each pair contains more neutrons?
(a) chlorine-35 or sulfur-33, (b) fluorine-19 or neon-19,
(c) copper-63 or zinc-65, (d) iodine-126 or tellurium-127
Consider the following nuclear symbols. How many protons, neutrons, and
electrons does each element have? What elements do R, T, and X
The element gallium, used in gallium arsenide semiconductors, has an atomic
weight of 69.72 amu. There are only two isotopes of gallium, Ga with a mass of
68.9257 amu and 71Ga with a mass of 70.9249 amu. What are the isotopic
abundances of gallium?
The following table presents the abundances and masses of the isotopes of zinc.
What is the atomic weight of zinc?
Provide the symbol of the following ions, given the number of protons and
electrons in each.
(a) 8 protons, 10 electrons
(b) 20 protons, 18 electrons
(c) 53 protons, 54 electrons
(d) 26 protons, 24 electrons
In what region of the periodic table are you likely to find elements that form
more than one stable ion?
What is the difference between an ionic bond and a covalent bond?
The molecular formula for the ethylene monomer is C2H4. What is its empirical
Of the following elements, which two would you expect to exhibit the greatest
similarity in physical and chemical properties? Cl, P, S, Se, Ti.
Calcium and fluorine combine to produce an ionic calcium fluoride, CaF2. Use
the periodic table to predict at least two other compounds that you would expect
to have structures similar to that of CaF2.
The molecule shown below is responsible for the smell of popcorn. Write the
correct molecular formula for this compound.
The compound shown below forms an amorphous solid (a glass) at room
temperature, and has been used as a medium for storing information
holographically. Write the correct molecular formula for this molecule.
Name each of the following ionic compounds. (a) K2S, (b) CoSO4,
(c) (NH4)3PO4, (d) Ca(ClO)2
Give the formula for each of the following ionic compounds. (a) ammonium
carbonate, (b) calcium iodide, (c) copper(II) bromide, (d) aluminum phosphate,
(e) silver (I) acetate
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