Question

1 multiple choice 1 point
a homogeneous mixture was formed consisting of ethanol being dissolved in isopropyl alcohol. which substance represents the solute of the solution?
both of these
ethanol
isopropyl alcohol
neither of these
clear my selection
2 multiple choice 1 point
which of the following compounds could be classified as a precipitate?
cach₃coo
ca₃(po₄)₂
cacl₂
ca(oh)₂
clear my selection

Explanation:

Question 1

In a solution, the solute is the substance dissolved, and the solvent is the dissolving medium. Here, ethanol is dissolved in isopropyl alcohol, so ethanol is the solute.

Precipitates are insoluble (or sparingly soluble) in water. Calcium phosphate ($\ce{Ca3(PO4)2}$) is insoluble, while calcium acetate ($\ce{Ca(CH3COO)2}$), calcium chloride ($\ce{CaCl2}$), and calcium hydroxide ($\ce{Ca(OH)2}$ - slightly soluble but more soluble than $\ce{Ca3(PO4)2}$ in typical cases) are more soluble. So $\ce{Ca3(PO4)2}$ is a precipitate.

Answer:

B. ethanol

Question 2