Scelta multipla
Which of the following is the correct chemical formula for tetraphosphorus heptasulfide?
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3. Chemical Reactions
Naming Molecular Compounds
Scelta multipla
What is the correct name for the compound CoCl_2?
A
Cobalt chloride
B
Cobalt(II) chloride
C
Cobalt(III) chloride
D
Cobalt dichloride
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Identify the metal and its possible oxidation states. Cobalt (Co) can have multiple oxidation states, commonly +2 and +3.
Determine the charge on the chloride ion. Chloride (Cl) has a charge of -1.
Since the formula is CoCl_2, there are two chloride ions, each with a -1 charge, giving a total negative charge of -2.
To balance the charges, cobalt must have a +2 charge, so the oxidation state of cobalt in CoCl_2 is +2.
Name the compound by stating the metal with its oxidation state in Roman numerals followed by the name of the anion. Thus, the correct name is Cobalt(II) chloride.
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