Solutions and Mixtures Practice Test

A student mixes $10,\text{mL}$ of hexane ($\text{C}6\text{H}{14}$, nonpolar) with $10,\text{mL}$ of water (polar) in a test tube and shakes the mixture. After standing, two distinct layers are observed. Which statement is correct?

A student adds $1.0,\text{g}$ of calcium carbonate ($\text{CaCO}_3$) to $100,\text{mL}$ of water at room temperature and stirs. A solid remains at the bottom after several minutes. Which statement is most accurate?