Solids, Liquids and Gases

What are the best examples of an "amorphous solid"?

• butter, candle wax, jam, glass, rubber, plastics, coal

• salt, sugar, and snow

• gemstones, igneous rocks, sedimentary rocks, and metamorphic rocks

• diamonds, ice, and copper

The particles of amorphous solids, like plastics, are arranged...

• far apart from each other

• in no regular pattern

• in regular, repeating patterns

• so that the particles slide by each other

Which type of solids melt at a specific temperature?

• amorphous

• crystalline

• vibrating

• viscosity

Tags

NGSS.MS-PS1-4

What is surface tension?

• a resistance to flowing

• when water molecules are vibrating in place

• an inward force, or pull, among the molecules in a liquid that brings the molecules on the surface closer.

  This allows insects like water striders to walk on the surface of a pond.

If atmospheric pressure above water is great, meaning there is a lot of it - and therefore, many particles above the water pressing down on it, what is true about boiling water?

• water will boil at a higher temperature and the temperature will remain constant (it won't change) while it boils

• water will boil at a lower temperature and the temperature will increase as it boils

• water will boil at a lower temperature and the temperature will remain constant (it won't change) while it boils

• water will boil at a higher temperature and the temperature will increase as it boils

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What property of gas allows a large volume of it to be put into a smaller tank?

• they can be changed to liquids

• they can be changed to solids

• they can be compressed

• they can be inflated

What point on the graph represents where a change of state has been completed?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-4

What do lines AB and CD represent?

• a change of state

• a solid

• a liquid

• a gas

Tags

NGSS.MS-PS1-4

The horizontal portions of the graph represent particles that are __________ in thermal energy. Therefore, the particles are moving more rapidly.

Tags

NGSS.MS-PS1-4

What are the best two examples of sublimation?

• Clothing is hung outside on a day when the temperature is below the freezing point of water. The clothes dry, even though they freeze first.

• An ice cube melts on the floor, then it evaporates.

• Bromine is a reddish-brown, liquid element. In a closed container, a reddish brown gas exists above the surface of the bromine.

• Dry ice changes directly to carbon dioxide gas.

Tags

NGSS.MS-PS1-4