Module 4 Practice
- Page ID
- 278644
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Exercise \(\PageIndex{1}\)
Name the compound below. Hint: Is it ionic or covalent? Is the cation predictable or variable?
CuCN
- Hint
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It is ionic. It is variable, so you must determine the charge needed to make a total of zero charge. Roman numeral is needed.
- Answer
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copper (I) cyanide
Exercise \(\PageIndex{1}\)
Name the compound below. Hint: Is it ionic or covalent? Is the cation predictable or variable?
PCl5
- Hint
-
It is covalent. There is no cation. Use prefixes to tell how many of each element are in the formula.
- Answer
-
phosphorus pentachloride
Exercise \(\PageIndex{1}\)
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- Hint
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It is covalent. There is no cation. Use prefixes to tell how many of each element are in the formula.
- Answer
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Exercise \(\PageIndex{1}\)
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- Hint
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It is covalent. There is no cation. Use prefixes to tell how many of each element are in the formula.
- Answer
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Exercise \(\PageIndex{1}\)
K Ca
Rb Sr
Out of the four elements listed above, choose the one that has
j) the largest radius
k) the least ionization energy
l) the most metallic character
- Answer j
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Rb
- Answer k
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Rb
- Answer l
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Rb
Exercise \(\PageIndex{1}\)
The element chlorine is found in nature as a mixture of 35Cl and 37Cl. Given that the average atomic mass of chlorine is 35.45 amu, which isotope is more abundant?
- Answer
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35Cl is more abundant. Since the average mass is closer to 35 amu, you have more of the isotope with a mass of 35 amu than you do of the isotope with a mass of 37 amu.
Exercise \(\PageIndex{1}\)
If there were chemists on another planet, their periodic table might be different because the elements might have different "natural" abundances. If on the other planet, the element sulfur had the following natural abundances, calculate the average atomic mass that the chemists on that planet would use.
68.44 % is 32S with mass of 31.9721 amu
23.24 % is 33S with mass of 32.9715 amu
8.32 % is 34S with mass of 33.9679 amu
- Answer
-
Add up (uncertain digits are underlined):
21.8817amu
7.6626 amu
2.8261 amu
Total is 32.3704 amu which rounds to 32.37 amu
Exercise \(\PageIndex{1}\)
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- Answer
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