Module 4 Practice

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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

It is ionic.  It is variable, so you must determine the charge needed to make a total of zero charge. Roman numeral is needed.

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.

phosphorus pentachloride

Exercise $$\PageIndex{1}$$

Hint

It is covalent.  There is no cation.  Use prefixes to tell how many of each element are in the formula.

Add texts here. Do not delete this text first.

Exercise $$\PageIndex{1}$$

Hint

It is covalent.  There is no cation.  Use prefixes to tell how many of each element are in the formula.

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Exercise $$\PageIndex{1}$$

K                Ca

Rb              Sr

Out of the four elements listed above, choose the one that has

k)  the least ionization energy

l)  the most metallic character

Rb

Rb

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?

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

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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