Mixtures and Solutions Quiz

Which description BEST defines a mixture?

• A single pure substance with a fixed ratio of elements

• Two or more substances physically combined while retaining their properties

• A compound formed by chemical reaction of two substances

• A solvent containing only one solute

The photo of a vegetable salad is classified as a…

• Homogeneous mixture

• Heterogeneous mixture

• Solution

• Colloid

Based on the lesson image, vinegar is best described as a…

• Suspension

• Heterogeneous mixture

• Homogeneous mixture

• Colloid

In the oil + vinegar image, which property explains the separation into layers?

• Oil has the same density as vinegar

• Oil is more dense than vinegar

• Oil is less dense and immiscible with vinegar

• Vinegar chemically reacts with oil

Which is TRUE for all mixtures?

• Components lose their chemical identities

• Components can never be separated

• Components are chemically combined

• Components retain their original properties

Which of the following is a pure substance?

• Milk

• Saltwater

• Sugar (sucrose)

• Lemonade

Which observation MOST strongly indicates a heterogeneous mixture?

• Uniform color throughout

• Visible distinct phases or pieces

• Constant composition in any sample taken

• Cannot be separated by any physical means

Which setup would MOST likely produce a homogeneous mixture?

• Oil stirred into vinegar

• Sugar stirred into hot water

• Sand mixed with water

• Pebbles added to water

A student claims “soda is heterogeneous because bubbles are visible.” The BEST evaluation is:

• Correct; gas makes all mixtures heterogeneous

• Incorrect; dissolved CO₂ and liquid can still be considered homogeneous at the bulk scale

• Correct; any mixture with two phases is a suspension

• Incorrect; soda is a pure substance

Which statement is MOST accurate about immiscible liquids like oil and vinegar?

• They form a stable solution if vigorously shaken

• They remain homogeneous at rest

• They separate due to differences in polarity and density

• They can be separated only by evaporation