Water Flashcards
mass per unit volume
density
most water on earth is _____
salt water
The human body is __% water
about 70
Water ____ upon freezing
expands
Is water polar or nonpolar?
polar
water molecules stick together through _______
hydrogen bonds
water is a versatile _______
solvent
the liquid in which a substance dissolved to form a solution
solvent
a liquid that is a completely homogenous mixture of 2 or more substances
solution
of a uniform quality throughout
homogenous
any polar molecule can interact with other polar molecules through hydrogen or _________ __________
electrostatic interactions
polar molecules are hydro____; nonpolar molecules are hydro_____
philic; phobic
water-loving
hydrophilic
water-hating
hydrophobic
a quantitative measure of the acidity or basicity of aqueous solutions
pH
pure water has an equal number of ________ ____ & _______ ____
hydrogen ions; hydroxide ions
pure water is said to be ______
neutral
a solution that contains more hydrogen ions than pure water is _____
acidic
a solution that contains fewer hydrogen ions than pure water is _____
basic
pH of 7.0 is _______
neutral
pH less than 7.0 is ______
acidic
pH more than 7.0 is ______
basic
because hydrogen & hydroxide ions are very _______, changes in their concentrations drastically affect molecules of a cell
reactive
the lower the concentration of hydrogen ions, the ________ the pH
higher
the higher the concentration of hydrogen ions, the _________ the pH
lower
