list of objectives (FA4) Flashcards
(23 cards)
what does STP stand for?
standard temperature and pressure
0°C = 273K
101.3 kpa
1 mol: 22.4L
what does RTP (SLC) stand for?
Room/Lab Temperature and Pressure
25°C = 298k
101.3 kpa
1 mol : 24.5L
what’s the formula for concentration?
c = n/v
or
C1V1 = C2V2
what’s the formula for either moles or mass?
n = m/m.m
m = n x m.m
what’s the pH equation?
pH = -log[H+]
what’s the hydrogen ion concentration equation?
[H+] = 10^-pH
what is the cause of the size and bond angle in various covalent molecules? (VESPR)
Lone pair repulsion, the angle of a bond is affected by the presence of lone pair of electrons at the central atom. A lone pair tries to repel bond pair resulting in the decrease of bond angle.
what’s the relationship between lone pairs and bond angles?
number of lone pairs up = bond angle down
what factors causes the boiling point of particular ionic or covalent compound?
intermolecular bonding, weight and dispersion forces
what’s the formula for either pressure, volume or temperature?
PV = nRT
what value does the gas law constant R have?
8.314 J/Mol
what does HPLC stand for?
High Performance Liquid Chromatography
what is Boyle’s law?
the volume of a fixed mass of gas at a constant temperature is inversely proportional to the pressure upon it
what is Gay Lussac’s law?
the pressure of a gas is directly proportional to its absolute temperature (measured in Kelvin) when the volume is held constant
P1/T1 = P2/T2
examples of properties of gasses
- low density
- exert pressure
- compress easily
- fill any container
- diffuse (mix) quickly
what is Charles’s law
the volume of a gas is directly proportional to its absolute temperature
V1/T1 = V2/T2
retardation factor formula
Rf = distance sample went/max distance sample can move
what is ionisation?
the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons
what is dissociation?
a general process in which molecules (or ionic compounds such as salts, or complexes) separate or split into other things such as atoms, ions, or radicals
acids + bases = ?
= salt and water
acids + metals = ?
= salt and hydrogen gas
acids + carbonates = ?
= CO2 + water + salt
what’s the relationship between pH and hydrogen ion concentration?
as the pH increases, the hydrogen ion concentration decreases
