The Water Molecule
What is the smallest unit of matter? (HINT: it means "indivisible.")
The atom
Surface tension
When a molecule has opposite charges on opposite sides
Polar molecule
pH 7
Polar or Nonpolar: water
Polar
What elements and how many of each are in a water molecule?
1 oxygen and 2 hydrogen atoms
Water sticks to things other than water
Adhesion
What is the rule for dissolving substances regarding their polarity?
Like dissolves like
Pure water is acidic / basic / neutral.
A pH of 3 (Acid, base, or neutral?)
Acid
When water freezes, its solid version expands / shrinks / stays the same.
Expands
When water sticks to itself
Why don't water and oil mix?
Water is polar, oil is non-polar
Allows water to take a lot of heat before evaporating
High specific heat
A pH of 12. (Acid, base, or neutral?)
Base
What atom(s) in a water molecule carries a partial positive charge?
Why does ice float on water?
Because frozen water (ice) forms spaces between molecules, making ice less dense.
Water is a polar / nonpolar molecule. (Write down the correct answer)
Polar
Many polar substances dissolve in water because water is a ____ ____
Universal solvent
Polar or Nonpolar: oil
Nonpolar
How many hydrogen bonds can a water molecule form?
Four
This property allows trees to pump water from the roots to the leaves without spending any energy.
Capillary action
The intermolecular forces or attractions formed by water molecules.
Hydrogen bonds
Why does acetone evaporate faster than water?
Acetone cannot hydrogen bond with itself, whereas water forms 4 hydrogen bonds, which keeps them together.
Polar or Nonpolar: Capsaicin
Nonpolar
Why does water worsen your situation when you eat spicy food?
Because capsaicin is polar and water is nonpolar. Water is nonpolar. When you drink water, you get capsaicin everywhere in your mouth and down to your stomach.