Properties of Water: Amazing Water!

Select one of the most interesting facts you found after reading the '10 interesting things about water.'

• Water covers about 71% of the Earth's surface.

• Water is the only liquid that expands when it freezes.

• Water is made up of three hydrogen atoms and one oxygen atom.

• Water boils at 50 degrees Celsius.

Fill in the blank: ________ made life possible on Earth.

• Water

• Sand

• Plastic

• Iron

Fill in the blank: 96.5 percent of water on Earth is in our ________.

• oceans

• rivers

• lakes

• glaciers

Fill in the blank: Just 3.5 percent of Earth's water is ________.

• freshwater

• saltwater

• groundwater

• polluted

Which elements do water molecules contain?

• Oxygen (1) and hydrogen (2).

• Carbon (1) and hydrogen (2).

• Nitrogen (1) and oxygen (2).

• Sodium (1) and chlorine (2).

Which type of bonding is within a water molecule?

• Covalent bonding.

• Ionic bonding.

• Metallic bonding.

• Hydrogen bonding.

Which elements are bonded together to form a water molecule?

• Two hydrogen atoms and one oxygen atom

• Two oxygen atoms and one hydrogen atom

• One hydrogen atom and one oxygen atom

• Two hydrogen atoms and two oxygen atoms

A meniscus forms when water is in a narrow tube because:

• the adhesive forces between water and glass are stronger than the cohesive forces between water molecules.

• the cohesive forces between water molecules are stronger than the adhesive forces with glass.

• water molecules repel the glass surface.

• air pressure pushes the water up the sides of the tube.

Label these diagrams as 'adhesion' or 'cohesion'.

• adhesion

• cohesion

What does it mean if a molecule is "polar"?

• It means that there are regions of the molecule that are partially positive and regions that are partially negative.

• It means that the molecule is always electrically neutral.

• It means that the molecule cannot dissolve in water.

• It means that the molecule has no charge distribution at all.