The Unexpected Truth About Water

Which two gases were named by Antoine Lavoisier after his experiments?

• Nitrogen and Oxygen

• Hydrogen and Helium

• Oxygen and Hydrogen

• Carbon Dioxide and Oxygen

What is the chemical formula for water?

• O2

• H2O

• CO2

• H2O2

What characteristic of a water molecule results from oxygen attracting electrons more strongly than hydrogen?

• It becomes a non-polar molecule.

• It forms ionic bonds.

• It becomes a polar molecule.

• It becomes electrically neutral.

True or False - Hydrogen bonding allows water molecules to stick to other water molecules

• True

• False

Why does ice float on water?

• Ice is warmer than water

• Ice is less dense than water

• Ice is more compact than water

• Ice is heavier than water

What property of water allows water striders to walk on its surface?

• Adhesion

• Cohesion

• Evaporation

• Ionization

How do water molecules move from the roots to the leaves in a plant?

• Through evaporation and condensation.

• By sticking to each other and the plant's vascular system.

• Due to the plant's internal heating system.

• Via the process of ionization.

What is the primary way the evaporation of sweat helps regulate body temperature?

• It increases the body's internal temperature.

• It creates a protective layer on the skin.

• It removes heat from the body as water changes from liquid to gas.

• It helps in the absorption of more water.

What is the pH of pure water?

• 0

• 7

• 14

• It does not have a pH

What is the function of chemical buffers in the human body?

• To increase the acidity of blood.

• To resist changes in the pH of blood.

• To transport oxygen to cells.

• To break down food in the stomach.