States of Matter and Gas Laws Part 2

During the phase change between points B & C, what is happening?

• Energy is being added in order to keep the state of matter the same.

• Energy is being added and a phase change from a solid to a liquid is taking place.

• Energy is being added to change the temperature of the solid as it changes to a liquid.

• Energy is not being added and a phase change from a liquid to a gas is taking place

Tags

NGSS.MS-PS1-4

A phase change chart, like the one above, illustrates which following true statements?

• Energy is always being added. That energy can be used to change the temperature or the state of matter or both at the same time.

• Energy is always being added. A given substance can either change its state or change its temperature, but not both at the same time.

• Temperature is always changing while a substance changes from one state/phase to another.

• A given substance can change its state at any temperature it wants.

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NGSS.MS-PS1-4

Which of the changes of state shown in the diagram are endothermic changes?

• Freezing and evaporation

• Freezing and condensation

• Evaporation and melting

• Condensation and melting

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NGSS.MS-PS1-4

Why might a balloon, that is inflated almost to capacity, pop or explode on an extremely warm day?

• The balloon may be faulty.

• It might pop because of the weakening of the balloon by heat.

• The balloon might pop due to the increase in the volume of gas.

• The balloon might pop because the volume will decrease within the balloon.

Tags

NGSS.MS-PS1-4

Which of the following would cause a DECREASE in the density of a sample of a gas inside the baloon?

• putting the balloon in the refrigerator

• taking the balloon outside on a hot day

• shaping the balloon into the shape of a dog

• taking the balloon down to the bottom of the ocean

Tags

NGSS.MS-PS1-4

All summer long, Timothy played basketball in his driveway. Because he was so excited about learning physical science, he left in a hurry to get to school on morning and the ball was left outside. Timothy was so busy studying during the fall, he didn’t get to play basketball. Over winter break, he went out to shoot hoops, but when he tried to dribble the ball, it would not bounce. Which of the following statements explains why his basketball had gone flat?

• In colder temperatures, the gas molecules inside the ball move slower (condense) and exert less pressure on the sides of the ball.

• In colder temperatures, the gas molecules inside the ball move faster (expand) and exert more pressure on the sides of the ball.

• In colder temperatures, the gas molecules inside the ball move slower (condense) and exert more pressure on the sides of the ball.

• In colder temperatures, the gas molecules inside the ball move faster (expand) and exert less pressure on the sides of the ball.

Tags

NGSS.MS-PS1-4

A ping pong ball with a dent in it can be put into a pan of boiling water. After a short amount of time, what will happen to the ping pong ball?

• The ping pong ball heats up and expands.

• The number of gas particles inside the ping pong ball increase causing more pressure

• The gas particles inside speed up due to heat and cause an increase in pressure within the ball.

• Gas particles inside collide with each other less and with the ball more causing the dent to pop out.

Tags

NGSS.MS-PS1-4

Keisha wanted the make a smore for dessert, so she placed a marshmallow in the microwave. The marshmallow expanded. Which of the following correctly describes what happened?

• As the marshmallow was heated, particles moved faster increasing its volume

• As the marshmallow was heated, particles moved faster decreasing its volume

• As the marshmallow was heated, particles moved slower increasing its volume.

• As the marshmallow was heated, particles moved slower decreasing its volume.

Tags

NGSS.MS-PS1-4

In the model, gas is being held in a container. Over time, the container is heated by a flame. The statements below describe what is happening inside the container as time passes between the first picture and the second. Three (3) statements are correct. Identify the incorrect statement.

• An increase in particle energy causes an increase in pressure.

• The change in temperature causes the particles to increase in number.

• As the temperature increases, the kinetic energy of the gas also increases

• A decrease in kinetic energy and pressure causes an increase in the volume of the container

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

How is the pressure of a gas related to its concentration of particles?

• Pressure will expand a gas, enlarging its volume and reducing its density and concentration of particles.

• Pressure will magnify a gas, developing its volume and multiplying its density and concentration of particles

• Pressure will compress a gas, reducing its volume and giving it a greater density and concentration of particles

• Pressure will accelerate a gas, extending its volume and allowing a smaller density and concentration of particles.