BIO122 CHAPTER 3 - WATER

Water is a unique substance because it can exist in how many states of matter?

• One

• Two

• Three

• Four

What is the molecular formula for water?

• H₂O₂

• H₂O

• H₂O₃

• H₃O

Which of the following best describes a polar molecule?

• Equal sharing of electrons

• Unequal sharing of electrons

• No sharing of electrons

• Sharing of electrons with no charges

Water molecules are capable of forming what type of bond with each other?

• Covalent bonds

• Ionic bonds

• Hydrogen bonds

• Metallic bonds

Which of the following substances is hydrophilic?

• Oil

• Non-polar molecules

• Salt

• Lipids

What does the property of cohesion allow water molecules to do?

• Stick to plant cell walls

• Form hydrogen bonds with other water molecules

• Dissolve non-polar substances

• Repel non-polar substances

Surface tension is caused by:

• Cohesion between water molecules

• The density of water molecules

• Adhesion of water molecules to surfaces

• The temperature of the water

Water's high specific heat means it:

• Heats up very quickly

• Maintains a stable temperature for longer

• Does not change temperature with the addition of heat

• Cools down quickly

When water evaporates, what happens to the surrounding temperature?

• It heats up

• It stays the same

• It cools down

• It fluctuates

The reason ice floats on water is because:

• Water has high density

• Ice is less dense than water

• Water molecules expand as they heat

• Ice melts when it touches water