Multiple Choice
Which common compound found in glass cleaner is primarily responsible for dissolving dirt and grease on a window?
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1. Intro to General Chemistry
Chemical Properties
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Which statement is true about one formula unit of CaBr2?
A
It contains one calcium ion and two bromide ions.
B
It contains two calcium ions and one bromide ion.
C
It contains one calcium atom and one bromine atom.
D
It contains two calcium atoms and two bromine atoms.
Verified step by step guidance1
Understand that a formula unit represents the simplest ratio of ions in an ionic compound, not individual atoms.
Identify the chemical formula given: CaBr2, which indicates one calcium ion (Ca^{2+}) and two bromide ions (Br^{-}).
Recall that calcium typically forms a 2+ charge ion, and bromine forms a 1- charge ion, so the formula balances the charges with one Ca^{2+} and two Br^{-} ions.
Recognize that the formula unit does not represent atoms bonded covalently but rather the ratio of ions in the ionic lattice.
Conclude that one formula unit of CaBr2 contains one calcium ion and two bromide ions.
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