LHS HB Water and pH

Attractions between different water molecules are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

Water has an uneven distribution of charges across the molecule.  Which property is being described?

• density
• polarity
• capillary action
• specific heat

What two elements make up water?

• Helium and oxygen
• Hydrogen and oxygen
• helium and carbon
• oxygen and carbon

Why is the Oxygen portion of a water molecule negative?

• Electrons spend less time orbiting the smaller oxygen atom
• Electrons spend more time orbiting the larger oxygen atom
• Oxygen is always negative because it is an unstable element

What type of bond is depicted in the image holding the oxygen to the hydrogen within a water molecule

• Covalent
• Ionic
• Hydrogen

What property of water allows it to be such a versatile solvent that it is often called the "universal solvent?"

• Purity
• Polarity

• High heat capacity
• Expansion upon freezing

Large bodies of water do not quickly fluctuate in temperature. Why?

• Water is a solvent.
• Water has a high heat capacity.
• Water acts as a buffer.
• Water is non-polar.

What word describes when water is attracted to other substances?

• cohesion
• adhesion
• capillary action
• surface tension

The attraction that causes water and other liquids to form drops on thin films is called ________________. This is also water’s ability to be attraction to other water molecules.

• adhesion
• capillary action
• cohesion
• surface tension

A water strider can skate along the top of a pond because:

• covalent bonds result in water cohesion
• hydrogen bonds result in water cohesion (surface tension)
• water striders have adapted to take advantage of water cohesion
• low surface tension of water