Water

What is the melting point of ice?

• 0 °C
• 100 °C
• 50 °C
• 30 °C

What is the boiling point of water?

• 0 °C
• 100 °C
• 50 °C
• 30 °C

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

More than ____________ of the Earth's surface is covered by water.

• 80%

• 90%

• 97%

• 70%

Tags

NGSS.MS-ESS2-4

When a solid reaches the temperatures of its ___, it can become a liquid.

• melting point
• freezing point
• boiling point
• density

Tags

NGSS.MS-PS1-4

The freezing and melting points of water are the same.

• True
• False

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Choose the physical characteristics of water. (You can choose more than one answer.)

• Colourless

• Odourless

• Tasteless

• Acidic

___________________ is an attractive force between the same type of molecules.

• Cohesive force

• Adhesive force

• Friction force

• Drag force

______________________ is an attractive force between different types of molecules.

• Cohesive force

• Adhesive force

• Drag force

• Thrust force

When we add salt into pure water, the boiling point of the solution will

• be more than the boiling point of the pure water.

• be less than the boiling point of the pure water.

• same as the boiling point of the pure water.

Insects like daddy longlegs can move on the surface of the water because of

• the higher density of water.

• the special ability of floating.

• the high surface tension of water.