Science
Chemistry HW

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homework for chemistry class do it all the 15 questions.

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CHEM 110 Homework 2 1 Which one element forms the backbone of nearly all common polymers? What other elements are also found in common household polymers? 2 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 3 Consider the following nuclear symbols. How many protons, neutrons, and electrons does each element have? What elements do R, T, and X represent? (a) 4 30 14 R (b) 89 39T (c) 133 55 X The element gallium, used in gallium arsenide semiconductors, has an atomic 69 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? 5 The following table presents the abundances and masses of the isotopes of zinc. What is the atomic weight of zinc? 6 Provide the symbol of the following ions, given the number of protons and electrons in each. 7 (a) 8 protons, 10 electrons ANS (b) 20 protons, 18 electrons ANS (c) 53 protons, 54 electrons ANS (d) 26 protons, 24 electrons ANS In what region of the periodic table are you likely to find elements that form more than one stable ion? 8 What is the difference between an ionic bond and a covalent bond? 9 The molecular formula for the ethylene monomer is C2H4. What is its empirical formula? 10 Of the following elements, which two would you expect to exhibit the greatest similarity in physical and chemical properties? Cl, P, S, Se, Ti. Explain your choice. 11 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. 12 The molecule shown below is responsible for the smell of popcorn. Write the correct molecular formula for this compound. 13 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. 14 Name each of the following ionic compounds. (a) K2S, (b) CoSO4, (c) (NH4)3PO4, (d) Ca(ClO)2 15 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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CHEM 110 Homework 2

1

Which one element forms the backbone of nearly all common polymers? What
other elements are also found in common household polymers?
Answer: Carbon is the element that is important in production of all common
polymers. Apart from it, the other common elements are: Hydrogen, Oxygen,
Chlorine, Sulfur, Nitrogen etc.

2

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

Answer: (a) chlorine-35 (18 neutrons) (b) fluorine-19 (10 neutrons)
(c) zinc-65 (35 neutrons) (d) tellurium-127 (75 neutrons)

3

Consider the following nuclear symbols. How many protons, neutrons, and
electrons does each element have? What elements do R, T, and X
represent? (a)

30
14 R

(b)

89
39T

(c)

133
55 X

Answer:
Protons

Neutrons

El...

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