3.2- water

Facts about Water

- Water can absorb a large amount of heat without changing temps - This is b/c hydrogen bonds are constantly forming and breaking within the water. - Water takes a while to heat up and a while to cool down - Large bodies of water help maintain the Earth's temperature

Water is considered an excellent solvent. what does that mean?

The arrangement of atoms in a molecule of water causes the molecule to be imbalanced

what are the different phases of water?

solid, liquid, and gas

How many different atoms occur naturally?

92

What is the chemical formula for water?

H2O

Relate these 3 words to each other- solvent, solute, solution

A solution is a mixture of one or more soluble substances, called solutes, dissolved in a liquid called the solvent

What are hydrogen bonds?

A weak chemical bond between an electronegative atom.

What elements are in a water molecule?

Hydrogen and Oxygen

What is surface tension?

The tension of the surface film of a liquid caused by the attraction of the particles in the surface layer.

what is so different about the density of water when it is a solid, compared to most other solids on earth?

Water expands when it freezes unlike most substances, so the ice is less dense.

Describe "adhesion" as it applies to water molecules

Water is attracted to other substances

Describe "cohesion" as it applies to water molecules

Water is attracted to water

Why is water so important/ necessary for life?

Water is important because it is one of the best solvents in nature. Water is also a polar molecule.

What is capillary action?

another term for capillarity

what does it mean to say "Water has a high heat capacity?"

It means that it takes a greater amount of energy to raise the volume of a substance

what does it mean to say " water is a polar molecule?"

It means that water has a positive side and a negative side, it allows the polar substances to dissolve well in water.

What does a chemical formula tell us about a molecule?

It tells use what elements or ions are in each molecule and how many of each are there.