Multiple Choice
Which of the following is a common location where chlorofluorocarbons (CFCs) can be found?
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1. Intro to General Chemistry
Chemical Properties
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Which of the following statements best describes what the chemical formula CaCl2 reveals about the compound it represents?
A
It contains two calcium ions and one chloride ion.
B
It is composed of two calcium atoms and two chlorine atoms.
C
It is a covalent compound formed by calcium and chlorine sharing electrons.
D
It contains one calcium ion and two chloride ions.
Verified step by step guidance1
Identify the elements present in the chemical formula CaCl2: calcium (Ca) and chlorine (Cl).
Understand that the subscript '2' after Cl indicates there are two chlorine atoms (or ions) for every one calcium atom (or ion).
Recognize that calcium is a metal and chlorine is a nonmetal, so CaCl2 is an ionic compound formed by the transfer of electrons, not sharing (which would indicate a covalent bond).
Interpret the formula CaCl2 as containing one calcium ion (Ca^{2+}) and two chloride ions (Cl^{-}), reflecting the ionic charges that balance to make a neutral compound.
Conclude that the formula reveals the ratio of ions in the compound: one calcium ion combined with two chloride ions.
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