Particles in Motion

The movement of particles from an area of higher concentration (more particles) to an area of lower concentration. The particles spread out.

• Dissolving

• Diffusion

• Density

• Thermal Expansion

In which image has diffusion completed ?

• 1

• 2

• 3

Adding energy to water causes the water particles to...

• speed up

• slow down

Tags

NGSS.MS-PS1-4

Kinetic energy is what type of energy?

• chemical

• electric

• motion

• sound

A student stirred a teaspoon of sugar into hot tea and another into cold tea. The sugar in the hot tea dissolved faster. Why?

• Hot tea liquid particles have more KE and collide more often.

• Hot tea liquid particles have more KE and collide less

• Cold tea particles have more KE and collide more

• it does not matter if something is hot or cold

Tags

NGSS.MS-PS1-4

A student drew a representation of the atoms of a solid. The illustration shows closely packed atoms vibrating, but remaining in the same relative positions.

Which of the following changes must the student make to the illustration to accurately represent the same substance in the liquid phase?

• The illustration should show increased movement of the atoms.

• Each individual atom should be larger.

• There should be very wide spaces between the atoms.

• The shape of each atom must reflect the shape of the container.

Tags

NGSS.MS-PS1-4

Particles that decrease in kinetic energy _____.

• move faster and have more collisions

• move slower and have more collisions

• move slower and take up more space

• move slower and have fewer collisions

At higher temperatures, the particles have more __________ energy, so __________ more frequently.

• kinetic; collide

• potential; expand

• chemical; react

• thermal; dissolve

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Not all particles in a substance move at the same ________, some are faster, some are slower.

• speed

• direction

• energy

• fast

Tags

NGSS.MS-PS1-4

As the kinetic energy of the particles increased, the _____ of the particles ________

• speed; decreased

• speed: increased

• space; decreased

• space; increased

Tags

NGSS.MS-PS3-1