when diluting a stock solution the amount of stock solution you should use =
[what you want]/[what you need]*final volume
a solution of a weak acid and its conjugate base that resist changes in pH in both directions. buffer works best in the middle of its range where the amount of undissasociated acid is about equal to the amount of conjugate base.
why does surface tension occur?
meniscus forms with cohesion: water molecules at the surface hydrogen bond with those below them they create a net downward pull. adhesion:water molecules adhere to the glass and resist the downward pull.
why is water denser as a liquid than a solid?
ice- hydrogen bonds form a crystal structure with lots of spaces
how did life first begin, without a foundation?
-hot and molten earth, volcanoes released CO2, N2, and H2O vapor, H2O cools and forms oceans, reactions can occur in solution
theory of chemical evolution
simple chemical compounds in the ancient atmosphere and ocean combined to form more complex substances found in living cells using energy from heat + sunlight
the formation of H2CO (formaldehyde) +HCN was a critical step in chemical evolution because
energy from sunlight was converted to chemical energy (PE in chemical bonds)