Question

you are worried that a solid substance has dissolved in a beaker of water in a lab. what would be a way to separate the substance from the water? (1 point)
pass the solution through a filter to let the dissolved substance separate.
boil the water away, leaving the substance behind in the beaker.
pour the liquid along a rough surface that would catch the solid particles but not the water.
use a magnet to draw out the solid substance from the water.

Explanation:

Step1: Analyze each option

• Option 1: Filtering is for separating insoluble solids from liquids. Since the substance is dissolved (soluble), this won't work.
• Option 2: Boiling water (evaporation) can separate a soluble solid - liquid mixture. The water turns to vapor and the solid remains.
• Option 3: Pouring along a rough surface won't separate a dissolved solid. It might work for insoluble solids (like sand - water), but not for dissolved ones.
• Option 4: Using a magnet is for separating magnetic substances. There's no info that the solid is magnetic.

Answer:

Boil the water away, leaving the substance behind in the beaker.