Bellwork 1 Week 2: 3rd Nine Weeks

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

• Purity
• Polarity and high surface tension
• 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.

Water is a universal solvent

• True
• False

The chemical compound of water is

• HO
• H₂O
• H₃O
• HO₂

What is an example of something that dissolves in water

• Yourself
• Sugar
• A rock
• A boat

Why can water have no net charge but have slight charges in different parts of the molecule?

• The oxygen end is slightly negative and the hydrogen end is slightly positive
• The hydrogen end is slightly negative and the oxygen end is slightly positive
• The hydrogen and oxygen ends change in polarity
• Because it is hydrophobic

Which of the following is LEAST likely to dissolve in water?

• nonpolar fats and oils
• polar sugar molecules
• salt made of a positive sodium ion and a negative chloride ion
• all of the substances will dissolve easily in water

Which types of compounds dissolve easily in water?

• Polar and Nonpolar
• Polar and Ionic
• Nonpolar and Ionic
• Covalent and Nonpolar

Why can some insects walk on water?

• The water sticks to the insect.
• The insect is too light to break the surface tension.
• The insect has hydrophobic oils on its legs.
• Insects can't walk on water.

A molecule with electrically charged areas is called a _______________.

• magnet
• polar molecule
• solution
• electrical molecule