Properties of Water Review

Attractions between water molecules are called

• Covalent bonds

• Ionic bonds

• Polar bonds

• Hydrogen bonds

Why does ice float?

• As water freezes, the molecules move farther apart and its density decreases.

• As water freezes, it takes up more hydrogen from the atmosphere

• As water freezes, air becomes trapped between the water molecules.

• As water freezes, it takes up more oxygen from the atmosphere

Which term refers to water having a slightly positive and a slighty negative charge on its ends?

• cohesion

• surface tension

• polar

• adhesion

Why does water moderate temperature so well?

• It does not allow heat in between the hydrogen bonds.

• More energy is needed to break all the hydrogen bonds, or rebuild them, between water molecules.

• Water has high energy all the time, so it can't heat up any more.

• The polarity of the water molecule resists the added energy, causing water to stay the same temperature.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which end of the water molecule has a slightly negative charge?

• the oxygen end

• the hydrogen end

• both ends are slightly negative

• neither end is negative

Why is water so good at dissolving so many substances?

• it is polar

• it is less dense as a solid

• cohesion

• adhesion

Refer to the picture; the meniscus is occurring because of:

• Adhesion

• Cohesion

Refer to the picture; the water is sticking to the spider web because of:

• Adhesion

• Cohesion

Describe COHESION.

• Water molecules attracted to other substances.

• Water molecules climbing upwards against the force of gravity.

• Water molecules dissolving many substances because of its polarity.

• Water molecules attracted to other water molecules.

Describe ADHESION.

• Water molecules attracted to other substances.

• Water molecules climbing upwards against the force of gravity.

• Water molecules dissolving many substances because of its polarity.

• Water molecules attracted to other water molecules.