Molecular Motion

Molecular Motion

• The motion of atoms in an object, also is determined by the temperature

• when water in the form of ice, rain, sleet, hail, or snow, falls to Earth

• a liquid(water) turns to gas(vapor)

• smallest unit of matter

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Why does liquid water take the shape of its container, but solid ice does not?

• Because the molecules of liquid water are softer than the molecules of solid ice

• Because the molecules of liquid water are smaller than the molecules of solid ice

• Because the molecules of liquid water are moving but the molecules of solid ice are not

• Because the molecules of liquid water easily move past one another but the molecules of solid ice cannot

Tags

NGSS.MS-PS1-4

How do molecules of hot air differ from molecules of cold air?

• the molecules of hot air move faster than the molecules of cold air

• the molecules of hot air move slower than the molecules of cold air

• the molecules always move at the same speed

• it is not possible to say anything about the speed of molecules

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

In which state of matter are the molecules furthest apart and therefore the least dense?

• Solid

• Liquid

• Gas

• Salad

A cup of hot tea was left on the counter in an air-conditioned room for several hours. What happens to the molecules of the liquid in the cup?

• The size of the molecules decreases

• The space between the molecules decreases

• The motion of the molecules increases

• The number of molecules decreases

Tags

NGSS.MS-PS1-4

At higher temperatures

• particles in an object have less energy

• particles in an object move faster

• a gas contracts

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A gas

• has a definite shape but no definite volume

• has a definite volume but no definite shape

• has fast-moving particles

Tags

NGSS.5-PS1-1

NGSS.5-PS1-3

Particles of a liquid

• are tightly packed together and stay in a fixed position.

• are free to move around one another but still touch.

Tags

NGSS.MS-PS1-4

The temperature of a substance increases as___.

• the substance expands

• the average kinetic energy of its particles increases

• the substance's volume increases

• the substance's mass increases

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Why can people on one side of a room smell the scent of an air freshener sprayed on the opposite side of the room?

• The molecules of air freshener have thermally expanded

• The air pressure where the freshener was sprayed is greater than in the rest of the room

• The molecules of air freshener spread out until they are evenly distributed throughout the room

• The molecules of air freshener are amorphous