Unit 7 - Properties of Matter (L4-7) Test Review

A student observed a precipitate form during a chemical reaction. Which of the following did the student most likely observe?

• Bubbles of gas floated to the top of a solution.

• The color of a liquid changed when a solid was added to it.

• Steam rose from a flask when a powder was added to a liquid.

• A solid sank to the bottom of a container when two liquids were mixed.

Tags

NGSS.MS-PS1-2

The fuel butane (C₄H₁₀) reacts with oxygen (O₂) to form water (H₂O) and carbon dioxide (CO₂). Which of the following best describes the carbon atoms involved in this reaction?

• The number of carbon atoms does not change.

• Three carbon atoms are formed in the reaction

• Three carbon atoms are destroyed in the reaction.

• The arrangement of carbon atoms does not change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When coal is burned, sulfur is released into the air, where it reacts with oxygen to produce sulfur dioxide and sulfur trioxide. Which of the following is true of this process?

• The identity of each reactant remains the same.

• Sulfur dioxide and sulfur trioxide are the reactants in this change.

• The products have different chemical properties than those of the reactants.

• The products contain more sulfur atoms and fewer oxygen atoms than the reactants.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In photosynthesis, water (H₂O) and carbon dioxide (CO₂) react to form oxygen (O₂) and glucose (C₆H₁₂O₆). The following table shows the reactants and products of photosynthesis.

Reactants → Products

6 H₂O + 6 CO₂ → 6 O₂ + ? C₆H₁₂O₆

What number should replace the question mark to show the number of C₆H₁₂O₆ (glucose) molecules in a balanced chemical equation?

• 1

• 2

• 6

• 12

Tags

NGSS.MS-PS1-5

NGSS.MS-LS1-6

Which of the following occurrences indicates that a chemical reaction has taken place?

• An odor is produced by burning a sugar cube.

• A puddle is produced by melting an ice cube.

• A loud noise is produced by crushing a can.

• A shard of glass is produced by breaking a bottle.

Tags

NGSS.MS-PS1-2

Which reason explains why gas bubbles are released when a carbonated beverage is opened?

• Decreasing the pressure increases the rate of solution.

• The solubility of a gas in a liquid decreases with decreased pressure.

• Exposing a liquid to air causes it to become a saturated solution.

• The solvent changes from a liquid to a gas when the beverage is opened.

How is a dilute solution different from a concentrated solution?

• The dilute solution has a liquid solvent.

• The dilute solution is at a lower temperature.

• The dilute solution has a smaller total volume.

• The dilute solution has less solute per volume of solvent.

Saltwater is an example of a solution. Compared to the salt, which term best describes the water in the solution?

• solute

• solvent

• mixture

• suspension

Sugar in jar A is added to water in jar B, as shown in the diagram below. Which statement is true about the substance in Jar C?

• The substance is a homogeneous mixture.

• The sugar remains separate from the water.

• The particles in the substance will scatter light.

• The substance can no longer be separated by physical means.

Tags

NGSS.MS-PS1-2

Which of the following will slow the rate at which sugar dissolves in water?

• cooling the water

• crushing the sugar

• increasing the amount of sugar

• stirring the sugar into the water

Tags

NGSS.MS-PS1-4