Question

name: ________________________ teacher: ________ q1 chemistry: u1l7 unit 1 review date: ______________ 3. ** which statement correctly describes a mixture? a. a mixture can consist of a single element b. a mixture must have a uniform composition. c. a mixture can be separated by physical means. d. a mixture is always homogeneous.

Explanation:

• Option a: A mixture is a combination of two or more substances (elements or compounds), so it can't consist of a single element. Eliminate a.
• Option b: Mixtures can be heterogeneous (non - uniform composition, like a salad) or homogeneous (uniform composition, like salt water). So a mixture doesn't have to have a uniform composition. Eliminate b.
• Option c: Mixtures are made of substances that retain their individual properties, so they can be separated by physical means (e.g., filtering a mixture of sand and water, or evaporating salt water to get salt). This is correct.
• Option d: Mixtures can be heterogeneous (e.g., a mixture of oil and water) or homogeneous. So a mixture is not always homogeneous. Eliminate d.

Answer:

c. A mixture can be separated by physical means.