Unit 6 Review

Which of the following is made up of atoms?

• solids

• gas

• liquids

• matter

• heat and energy

The principle that states "Matter is made up of minute bits called atoms that are in constant motion"

• The Particle Theory of Matter

• The Kinetic Theory of Matter

• The Theory of Particle Motion

• The Atomic Theory of Matter

What is between the air particles inside a syringe?

• matter

• more air

• space

• atoms

Which of the following describes the particles of gas inside a sealed container?

• The particles are packed closely together.

• The particles are spread far apart.

• Almost all particles are on top of the container.

• Almost all particles are at the bottom of the container.

• All the particles are spread evenly throughout the container.

Mercury with a melting/freezing point of -39oC is placed inside a freezer with a constant temperature of -35oC. What will happen to the mercury?

• The mercury will not freeze because the freezer is warmer than the freezing point.

• The mercury will freeze because the freezer is warmer than the freezing point.

• The mercury will not freeze because the freezer is colder than the freezing point.

• The mercury will freeze because the freezer is colder than the freezing point.

When a substance changes from a liquid to a solid. Which of the following is true?

• The particles change shape.

• The particles have more kinetic energy

• The substance is freezing.

• The particles have less kinetic energy.

• The particles are held more strongly to one another.

Using the time temperature graph, at what temperature will the substance (not water) begin to boil?

• 10°C

• 40°C

• 80°C

• 110°C

Sugar can melt and sugar can dissolve. Choose each statement that explains what happens at the particle level when melting or dissolving occurs.

• Sugar melts when kinetic energy increases enough for the particles to move past one another.

• Sugar dissolves when its particles get soft enough to turn into liquid.

• Sugar melts when a liquid breaks particles away from the solid substance.

• Sugar dissolves when a liquid breaks particles away from the solid substance.

• Sugar dissolves when its particles are heated until the bonds holding them together as a solid break.

During the BC portion of the graph, the average kinetic energy of the molecules of the substance -

• increases

• decreases

• remains the same

• cannot be determined

A student was investigating air in a closed syringe. He compressed the air by pushing the plunger in as far as he could and then let go. The plunger returned to its original position. Why did the plunger return to its original position?

• The air particles outside the syringe pulled the plunger up.

• The air particles inside the syringe pushed the plunger up.

• More air particles rushed into the syringe and pushed the plunger up.

• The air pushed the plunger up when it tried to get out.