States of Matter

Thermal energy is transferred away from a sample of water vapor (steam). Which of these best describes the change of state that occurs?

• condensation from point A to point B

• vaporization from point A to point B

• condensation from point B to point C

Tags

NGSS.MS-PS1-4

A pot containing water is warmed on a stove top. What is true about the number of water particles in the pot after the water has been warmed?

• There are fewer water particles after warming since some of the water particles turned into air.

• There are more water particles after warming since some have split to become gaseous particles.

• The number of water particles is the same after warming, including the liquid and gaseous particles.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Which statement describes the particles in a gas?

• Gas particles are spaced far apart and move around freely.

• Gas particles are tightly packed together and move past each other freely.

• Gas particles are spaced far apart and move around slowly.

Dry ice is the common name for frozen CO2. As the temperature warms the frozen CO₂ becomes CO₂ gas without entering a liquid form.

Circle the picture that correctly models the change in state of CO₂ that occurs.

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Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A scientist is studying a volcano. She claims that the lava that comes out of the volcano is a liquid. She wants to make an argument to support her claim. What question should she ask to help her collect evidence for her argument?

• Does the lava have a definite volume and particles that are very far apart?

• Does the lava have a definite volume and does it flow freely?

• Is the lava made of particles that move around?

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Liquid copper is removed from a smelting furnace and left to cool until it undergoes a change of state. Which pair of diagrams illustrate the liquid copper particles during the change in state that occurs?

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Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Igloos are buildings that are made of packed snow. Which statement describes the particles that make up the igloo?

• The particles in the snow have some kinetic energy, but the particles only move around in place.

• The particles in the snow melt easily because they have more kinetic energy than liquid water.

• The particles in the snow have no kinetic energy.

Tags

NGSS.MS-PS1-4

Ice is melted on a hot plate, describe the thermal energy flow over the course of a few minutes. Why is there a period of time when the ice does not rise in temperature?

• When ice reaches its boiling point, thermal energy caused bubbles to form and the temperature does not rise.

• When ice reaches its melting point, thermal energy does not increase temperature because it is being used to create a change of state from solid to liquid.

• When ice reaches its melting point, thermal energy flows away until the ice melts.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Gas has what volume and shape?

• volume- definite

  shape- definite

• volume- definite

  shape- not definite

• volume- not definite

  shape- not definite

• volume- not definite

  shape- definite

Tags

NGSS.MS-PS1-4

A liquid is placed in an area with lower temperature. Thermal energy will __________. For the particles in the liquid, the kinetic energy and the motion will __________. The liquid will change state only if __________.

• Increase in the liquid, decrease, the liquid is warmed

• Increase in the surroundings, decrease, enough thermal energy is added or moved

• Not change, stay the same, the surroundings are warmed

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4