Properties of Water

Polarity

Uneven distribution of charges in a molecule (positive and negative); important for dissolving other polar molecules in water

Cohesion

Tendency to stick to other water molecules

Adhesion

Tendency to stick to other substances; water attracted to water

Capillary Action

Tendency to climb up due to the cohesion and adhesion properties of water

Surface Tension

Tightness caused by the pulling of water molecules on each other

Specific Heat

The amount of heat needed to raise 1kg of substance 1*

Hydrogen Bond

Weak bonds formed between water molecules

What is true about water’s molecules?

The chemical formula for water is H2O.

What is a curved surface in a graduated cylinder called?

Meniscus

What is true about a capillary action?

It explains how watermmoves against the force of gravity.

How does capillary action allow water to climb up the sides of a straw?

The combined forces of adhesion, cohesion, and surface tension are stronger than the force of gravity.

A mixture that forms when one substance dissolves another is called a (n) ___. The substance that does the dissolving is called a (n) __.

Solution…solute

Why can water dissolve many substances?

It's a polar molecules

What substance dissolves in water?

Salt

A substance that hates, or “fears” water is called

Hydrophobic

The amount of heat needed to increase the temperature of a certain mass of a substance by 1 °C is its

Specific heat

True or False? Compared with other substances, water requires a lot of heat tk increase its temperature.

True

What is not true about water's specific heat?

It makes large bodies of water heat up more quickly than nearby land.

How does the high specific heat of water affect your body?

Maintains a stable internal body temperature despite external body changes.

Which property of water allows insects like water striders to "walk" on its surface?

Cohesion and surface tension

Waters high specific heat is crucial for life on Earth because it:

Helps organisms maintain a stable internal temperature

Explain why ice floating is important for aquatic life.

It allows organisms to survive in the winter. It forms as a protective layer.