Solids Liquids Gases Plasma

When you bring two drops of water near each other and allow them to touch, they combine immediately and become one drop. This is mainly because:

• Water molecules are made of atoms.

• Water molecules are attracted to each other.

• Water molecules are magnetic.

• Water is a liquid.

Tags

NGSS.MS-PS2-5

If you put food coloring in room temperature water, the coloring spreads throughout the water. The water causes the color to spread mainly because:

• Water molecules are warm.

• Water molecules are in motion.

• Water is more dense than food coloring.

• Food coloring molecules are small.

When a thermometer is heated, the red liquid inside the thermometer moves up. This is mainly because:

• The red liquid is thin.

• The molecules move faster and get a little further apart.

• Hot liquid is lighter.

• The glass of the thermometer gets hot.

Tags

NGSS.MS-PS1-4

When a thermometer is cooled, the red liquid inside moves down. This is mainly because:

• Cold liquids sink.

• The glass of the thermometer gets cold.

• The molecules of the liquid move slower and get a little closer together.

• The red liquid is thick.

Tags

NGSS.MS-PS1-4

An increase in temperature increases molecular motion and increases the distance between atoms and molecules in liquids.

• true

• false

Tags

NGSS.MS-PS1-4

A(n) ____ in the speed of the molecules allows the attractions between molecules to bring them a little closer together.

• increase

• decrease

Tags

NGSS.MS-PS1-4

The molecules of the liquid inside the thermometer increase in speed when the thermometer is ___.

• heated

• cooled

Tags

NGSS.MS-PS1-4

When you heat a sample of gas, what happens to the particles that make up the gas?

• they move faster

• they break apart

• they get smaller

• the become more dense

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Heating a gas completely stops all of its molecular motion.

• true

• false

Tags

NGSS.MS-PS1-4

T/F: Air has mass.

• true

• false

Tags

NGSS.MS-ESS2-5