Question

which of the following lists two examples of mixtures?
a salad dressing; sugar
b air; gelatin
c lemonade; water
d salt water; salt

Explanation:

Step1: Recall mixture definition

A mixture is a combination of two or more substances where each retains its properties. Pure substances (elements/compounds) aren't mixtures.

Step2: Analyze Option a

Salad dressing is a mixture (oil, vinegar, etc.). Sugar is a pure compound (sucrose), not a mixture. Eliminate a.

Step3: Analyze Option b

Air is a mixture (gases like \(N_2\), \(O_2\), etc.). Gelatin is a mixture (protein, water, etc.). Both are mixtures.

Step4: Analyze Option c

Lemonade is a mixture (water, lemon juice, sugar). Water is a pure compound (\(H_2O\)), not a mixture. Eliminate c.

Step5: Analyze Option d

Salt water is a mixture (water, \(NaCl\)). Salt (\(NaCl\)) is a pure compound, not a mixture. Eliminate d.

Answer:

b. air; gelatin