S8P1B

Robert leaves a chocolate bar in his car while attending school all day. When he goes to his car in the afternoon, the bar has changed into a gooey liquid. Which statement BEST explains what happened to Robert's chocolate bar?

• The energy from the sun caused the chocolate to melt.

• The chocolate in the bar spread out due to entropy loss.

• The energy holding the solid bar together was lost over time and it became liquid.

• The liquid was the original state of the chocolate and over time it returned to this state.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How is the temperature of a gas related to the kinetic energy of its particles?

• As the temperature extends, the kinetic energy of the particles decreases.

• As the temperature increases, the kinetic energy of the particles increases.

• As the temperature decreases, the kinetic energy of the particles increases.

• As the temperature intensifies, the kinetic energy of the particles decreases.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which is the MOST accurate statement about the heating curve and energy?

• As time elapses, the substances turns into plasma and has the highest kinetic energy.

• Although the temperature increases, there is no information about energy change.

• Moving from C to A the temperature decreases but the kinetic energy increases

• Moving from A to C the temperature and the kinetic energy increases.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Consider this graph showing temperature over time. What would happen in this situation? The temperature decreases from 25°C to 15°C, the material _______ heat and its kinetic energy _________ as the material freezes to become a solid.

• absorbs, is divided

• releases, decreases

• remains the same, increases

• multiplies its, does not change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

If heat is absorbed by ice, what phase change occurs?

• gas to solid

• liquid to gas

• liquid to solid

• solid to liquid

Tags

NGSS.MS-PS1-4

While Ms. Brown's science class is studying changes in particle motion during phase changes, they add a few pieces of dry ice to a flask and cover it with a balloon. After a few minutes they observed the balloon starting to inflate. Predict what will happen if they put the flask with the inflated balloon onto a hot plate and raise its temperature from room temperature to 40 °C

• The balloon inflates further.

• No change occurs

• The balloon will deflate.

• The dry ice precipitates.

Tags

NGSS.MS-PS1-4

When a substance such as ice melts, its temperature increases. Describe what happens to the arrangement of the water molecules as the temperature increases.

• Water molecules separate into hydrogen and oxygen atoms.

• Water molecules become less orderly and they spread apart.

• The kinetic energy of the water molecules decreases proportionally to the temperature change.

• Water molecules lose all contact with one another and intermolecular forces are non-existent.

Tags

NGSS.MS-PS1-4

The molecule arrangement of ice, water and steam are very different. _______ has the most ordered arrangement, ______ has the next most orderly arrangement, and ___________ has the least orderly arrangement of molecules.

• ice, water, steam

• steam, water, ice

• water, steam, ice

• water, ice, steam

Tags

NGSS.MS-PS1-4

In which picture(s) will you find a state of matter that has particles who have more energy than liquid water?

• B and C

• A, B, and C

• B, C, and D

• All of them

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Consider the cooling curve above. The substance is changing state from a gas to a liquid to a solid. As the temperature changes we also know that

• there is a decrease in molecular attraction and kinetic energy.

• there is a decrease in kinetic energy and the molecules get closer together

• kinetic energy increases while potential energy decreases during the phase changes.

• although the molecules get closer together, there is no real change in the energy of the molecules.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4