Open Question
Why do some laboratory procedures involving oxygen-sensitive reactants or products call for using water that has been boiled and then cooled?
14. Solutions
Types of Aqueous Solutions
Multiple Choice
Which of the following substances forms a homogeneous mixture when mixed with water?
A
NaCl
B
Oil
C
Sand
D
Fe filings
Verified step by step guidance1
Understand the concept of a homogeneous mixture: it is a mixture where the composition is uniform throughout, meaning the substances are completely dissolved or evenly distributed at the molecular level.
Consider the nature of each substance when mixed with water: NaCl (table salt) is an ionic compound that dissolves readily in water, forming a uniform aqueous solution.
Oil is nonpolar and does not mix well with polar water molecules, so it forms a separate layer, resulting in a heterogeneous mixture.
Sand is a solid particulate that does not dissolve in water and will settle at the bottom, creating a heterogeneous mixture.
Fe filings (iron particles) are solid metals that do not dissolve in water and will also settle or remain suspended, leading to a heterogeneous mixture.
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