Question

which procedure correctly describes materials combining into a homogeneous mixture?
a soil and water are shaken in a container and left to separate into two substances
b 5 ml of cooking oil is added to 15 ml of water
c salt is sprinkled over freshly popped popcorn
d 5 g of salt is added to 100 ml of water

Explanation:

• A homogeneous mixture is a mixture in which the composition is uniform throughout.
• For option A: Soil and water form a heterogeneous mixture (suspension) as they separate into two substances.
• For option B: Cooking oil and water do not mix uniformly (they form a heterogeneous mixture - emulsion) since oil is non - polar and water is polar.
• For option C: Salt sprinkled over popcorn is a heterogeneous mixture as the salt is not uniformly distributed at a microscopic level.
• For option D: When salt (\(NaCl\)) is added to water, it dissolves. The \(Na^{+}\) and \(Cl^{-}\) ions are uniformly distributed throughout the water, forming a homogeneous mixture (solution).

Answer:

D. 5 g of salt is added to 100 mL of water