Properties of Water Part 1

Open Ended

In what ways do the properties of water contribute to the survival of living organisms?

Multiple Choice

Which of the following statements about water on Earth is correct?

• About 70% of Earth's surface is covered by water.

• Oceans contain less than half of Earth's water.

• All life forms exist only on land.

• Water is not found underground.

Multiple Choice

Which of the following best describes the structure of a water molecule?

• Two hydrogen atoms covalently bonded to one oxygen atom

• One hydrogen atom covalently bonded to two oxygen atoms

• Three oxygen atoms covalently bonded to one hydrogen atom

• Two oxygen atoms covalently bonded to two hydrogen atoms

Open Ended

Explain why oxygen needs to form bonds with other atoms to become stable, based on its valence electrons.

Multiple Select

Which of the following statements about water molecules are correct?

• Water molecules are held together by hydrogen bonds.

• Each hydrogen atom in water shares its electron with oxygen.

• Oxygen in water has a full valence shell after bonding.

• All electrons in hydrogen are shared in covalent bonds.

Multiple Choice

Which of the following best explains why the oxygen atom in a water molecule acquires a partial negative charge?

• Oxygen is less electronegative than hydrogen.

• Electrons are closer to the oxygen atom than to the hydrogen atom.

• Hydrogen atoms donate electrons to oxygen.

• Oxygen loses electrons to hydrogen atoms.

Open Ended

Explain how the difference in electronegativity between oxygen and hydrogen leads to the polarity of a water molecule.

Multiple Choice

What type of bond exists between water molecules and what causes it?

• Hydrogen bond caused by partial charges

• Ionic bond caused by full charges

• Covalent bond caused by shared electrons

• Metallic bond caused by delocalized electrons

Multiple Select

Which of the following statements about hydrogen bonds in water are correct?

• They form between the partially positive hydrogen of one molecule and the partially negative oxygen of another.

• They are stronger than covalent bonds within the water molecule.

• They are responsible for holding water molecules together.

• Each water molecule can form hydrogen bonds with up to four other water molecules.

Open Ended

Describe the three phases of water found in nature and explain why these phases are important for life on Earth.