Matter and Change Test Review

A sheet of paper is torn into several small pieces. Which type of change has happened to the paper?

• Physical change only
• Chemical change only
• Physical change and chemical change
• A change in appearance that is neither a physical nor chemical change

A chemist mixes liquid Substance X and solid Substance Y in a beaker, then stirs the mixture vigorously. Which observation or measurement would provide the strongest evidence that the two substances have undergone a physical change, but not a chemical change?

• Bubbles appear and rise throughout the mixture.
• The mixture produces a new solid substance that has a different color than Substance Y.
• The mixture can be separated into two substances, one with the same melting point as Substance X and the other with the same melting point as Substance Y.
• The mixture changes into a single substance that has a melting point between the melting points of Substances X and Y.

A science student wants to use distillation to separate a mixture of two substances in the liquid state. For the student to be successful, which property should be significantly different between the two liquids?

• Freezing point
• Boiling point
• Ability to react with oxygen
• Ability to dissolve a solid substance, such as table sugar

To model a liquid, a student places marbles in a sealed, transparent box. Each marble represents a particle of the liquid, and the box represents the container. Which action of the student would most improve the model?

• Shake the box vigorously so that the marbles move randomly throughout the box.
• Shake the box gently so that the marbles move past one another, but remain at the bottom of the box.
• Each of these actions would be an equal improvement.

A student is measuring the properties of a sample of ethanol. Which is an extensive property of the sample?

• Mass
• Color
• Temperature
• Boiling point

A student has clear, colorless liquids in two different beakers. What investigation could the student perform to determine which beaker contains water and which beaker contains a mixture of sugar and water?

• Measure the mass of both beakers to determine that the mixture is in the beaker with greater mass.
• Stir the contents of both beakers and observe carefully to see which beaker contains particles of sugar.
• Expose both beakers to a burner flame and observe the combustion of sugar in the beaker containing the mixture.
• Heat the liquids so that the water evaporates and observe precipitation of sugar in the beaker containing the mixture.

Why do all samples of a given substance have the same intensive properties?

• All the samples have the same mass or volume.
• All the samples have the same chemical composition.
• All the samples have the same temperature.
• All of the above

What are the three main states of matter?

• Atomic, molecular, ionic
• Mixture, solution, pure substance
• Solid, gel, powder
• Solid, liquid, gas

In which two groups are mixtures classified?

• Heterogeneous and homogeneous
• Solid and liquid
• Elements and compounds

A few spoonfuls of sugar crystals are mixed thoroughly until dissolved into water. Classify this mixture.

• A heterogeneous mixture of a solid and a liquid
• A homogeneous mixture of a solid and a liquid
• A homogeneous mixture of solids
• A heterogeneous mixture of liquids