SPS5. Phases of Matter

You have a mysterious substance in a closed container. You observe that it takes the shape of its container. When the lid is removed, the substance remains in the container. What state of matter is it and why is it NOT the other two states of matter?

• It is a Gas: takes shape of container.

  Liquid: would flow away.

  Solid: does not take shape of container.

• It is a solid: would remain in container.

  Liquid would flow out of container.

  Gas would escape when lid removed.

• It is aLiquid: takes shape of container

  Solid: does not take shape of container.

  Gas: would escape from container.

• It is both a liquid and a gas as they both take shape of container.

  Not a solid becaue a solid would retain its shape.

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SPS5a

Why would plasma be an effective cleaning agent for the maintenance of airplane jet engines?

• Plasma produces intense heat, which melts and removes dirt and debris from the jet engine components without damaging the metal

• Plasma is composed of charged particles that can effectively break down and remove carbon deposits and other contaminants while being gentle on engine surfaces.

• Plasma generates strong electrical currents that physically dislodge particles from engine components.

• Plasma behaves like a pressurized gas, flushing contaminants from hard-to-reach areas within the engine

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SPS5a

Two glass bulbs each having a volume of exactly 1L are connected by a valve.  The left bulb contains a sample of nitrogen gas at a pressure of 101.325 kPa (kiloPascal), the right bulb has been emptied of gas and the pressure in the right bulb is 0 kPa.

Which statement provides the BEST explanation for what happens when the valve between the bulbs is opened?

• The gas will expand into the empty bulb. Expansion of the gas will increase the gas pressure and increase the gas temperature.

• The gas will expand into the empty bulb. Expansion of the gas will increase the gas pressure and decrease the gas temperature.

• The volume available for the gas will double. Doubling the volume will cause the pressure to decrease.

• The volume available for the gas will double. Doubling the volume will increases the amount of gas to keep the pressure constant.

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SPS5b

A scubua diver fills his tank with compressed air. The tank becomes warmer. Which argument explains why this occurs.

• Compressing the air reduces its volume, forcing the molecules closer together, which increases their kinetic energy and generates heat.

• Compressing the air introduces friction between the air molecules, which generates heat as the molecules rub against each other.

• Compressing the air causes the molecules to lose energy and transfer heat to the tank walls, warming the tank.

• Compressing the air allows heat from the environment to be absorbed into the tank during the compression process.

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SPS5b

If air is heated inside the syringe, what can you expect to occur?

• The plunger will move deeper into the syringe.

• The plunger will move further out of the syringe.

• The syringe will take in additional air and increase pressure.

• The pressure of the air inside the syringe will remain the same.

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SPS5b

Boyle's law describes the relationship between the pressure and volume of gases. There is an inverse relatniship between pressure and volume as temperature remains the same. As pressure increases, what happens to volume?

• Increases

• Decreases

• Stays the Same

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SPS5b

Charles's Law describes the relationship between temperature and volume of gases as pressure reamins constant. There is a direct relationship between temperature and volume. If temerature increase, what happens to the volume?

• increases

• decreases

• stays the same

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SPS5b

A balloon filled with helium is heated until the temperature doubles. What happens to pressure?

• The pressure remains constant because the balloon expands to accommodate the increased temperature.

• The pressure doubles because the temperature doubles, assuming the volume remains constant.

• The pressure is reduced because heating decreases the density of helium gas inside the balloon.

• The pressure stays the same because helium is an inert gas and is unaffected by temperature changes