Properties and Behavior of Water

The video tutorial covers the properties of water, including its high specific heat, high heat of vaporization, and role as a universal solvent. It explains how water's polarity and hydrogen bonding contribute to these properties. The tutorial also discusses water's cohesion and surface tension, which enable phenomena like capillary action and allow insects to walk on water. Finally, it explains why ice is less dense than liquid water, highlighting the ecological importance of this property.

What causes the polarity in a water molecule?

• The higher electronegativity of hydrogen

• The equal sharing of electrons between hydrogen and oxygen

• The higher electronegativity of oxygen

• The non-polar nature of water

Why does water have a high specific heat?

• Due to its low molecular weight

• Because it is a non-polar molecule

• Because of its hydrogen bonds

• Due to its ionic bonds

How does sweating help cool the body?

• Sweat increases body temperature

• Sweat acts as an insulator

• Sweat reflects sunlight

• Sweat absorbs heat and evaporates, taking heat away

What makes water a universal solvent?

• Its ability to form ionic bonds

• Its low boiling point

• Its non-polar nature

• Its high polarity

What happens to NaCl when dissolved in water?

• It forms a precipitate

• It forms a gas

• It remains as a solid

• It splits into Na+ and Cl- ions

What is capillary action?

• The freezing of water in cold temperatures

• The movement of water through narrow spaces due to cohesion and adhesion

• The movement of water due to gravity

• The evaporation of water from leaves

How do water striders walk on water?

• They have special feet that repel water

• They use wings to hover above water

• They swim just below the surface

• They are very light and do not break the surface tension

Why is ice less dense than liquid water?

• Ice molecules are packed more tightly

• Ice is composed of different elements

• Ice contains more air bubbles

• Ice molecules are arranged in a hexagonal structure with more space

What is the benefit of ice floating on water for aquatic life?

• It prevents water from evaporating

• It increases the water's salinity

• It insulates the water below, maintaining a stable temperature

• It provides a habitat for polar bears

What shape do water molecules form when they freeze?

• Cubic

• Spherical

• Hexagonal

• Pyramidal