Expansion and Contraction

Particles in a _____________ are tightly packed together.

• solid
• liquid
• gas
• plasma

When objects absorb heat, the particles...

• gain energy and vibrate at fixed position.
• gain energy and increase in size.
• gain energy and move slower.
• gain energy and move faster.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When objects contract upon cooling...

• volume increases and density increases.
• volume increases and density decreases.
• volume decreases and density decreases.
• volume decreases and density increases.

Tags

NGSS.MS-PS1-4

The liquid in the thermometer rises when it is placed in the hot water because ___________. 

• it gains heat from the hot water and expands.
• loses heat from the hot water and contracts. 
• the surrounding air is too warm. 
• the liquid is boiling. 

Tags

NGSS.MS-PS1-4

Why do balloons get bigger and sometimes burst when they get hot?

• The balloon melts.

• The gas in the balloon expands because the gas particles are moving faster as they heat up.

• The gas in the balloon contracts because the gas particles are moving faster as they heat up.

• The heat makes a hole in the balloon.

Tags

NGSS.MS-PS1-4

Why do balloons get smaller when they get cold?

• The balloon freezes.

• The balloon gets a hole in it.

• The air pressure outside the balloon causes the balloon to shrink.

• The gas in the balloon contracts because the gas particles slow down when they get cold.

Tags

NGSS.MS-PS1-4

The small gaps between tracks of train enable the tracks to ______________ and preventing any damage.

• contract

• expand

• longer

• shorter

Tags

NGSS.MS-PS3-4