객관식
Which type of chemicals commonly react with both water and oxygen when they enter water systems, often leading to corrosion or pollution?
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1. Intro to General Chemistry
Chemical Properties
객관식
Which of the following species would you least expect to find in an aqueous solution of CaCl_2?
A
CaCl_2 (s)
B
Ca^{2+}
C
H_2O
D
Cl^{-}
검증된 단계별 안내1
Step 1: Understand the nature of CaCl_2 in water. Calcium chloride (CaCl_2) is an ionic compound that typically dissociates completely in aqueous solution into its ions.
Step 2: Write the dissociation equation for CaCl_2 in water: \(\mathrm{CaCl_2 (s) \rightarrow Ca^{2+} (aq) + 2Cl^{-} (aq)}\).
Step 3: Recognize that in an aqueous solution, the solid form of CaCl_2 (s) is not expected to remain because it dissolves to form ions.
Step 4: Identify the species present in the solution: \(\mathrm{Ca^{2+}}\) ions, \(\mathrm{Cl^{-}}\) ions, and water molecules (\(\mathrm{H_2O}\)).
Step 5: Conclude that the species least expected to be found in the aqueous solution is the undissolved solid CaCl_2 (s), since it dissolves completely under normal conditions.
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