Chemical Reactions & Stoichiometry Flashcards
What is one mole?
6,022 x 10^23
What is Avogadro’s number?
1 mole = 6.022 x10^23
What are the units of the equation: M=m/n ?
g/mol= g/mol
What are the components of M=m/n
Molar mass = sample mass / number of moles
What does Ar start for?
Relative atomic mass
What is the molar mass of oxygen?
16
What is the molar mass of hydrogen?
1
What is the molar mass of carbon?
12
What ar the units of C = n/V
Moles (n) / litre (L)
What are the components of C=n/V
Concertration = number of moles/ volume
What is 1 litere the same as?
Dm^3
What are the components of c1V1=c2V2
Initial concentration x initial volume = final concentration x final volume
What is the molecular formula & empirical formula of benzene
Molecular: C6h6
Emerperical: CH
What does the empirical formula tell us?
The ratio between the elements in the compound
Formula for percentage yield
Percentage yield = ( actual yield / theoretical yield ) x 100%
Formula for ideal gas law
Pv=nrt
Conversion of Celsius to Kelvin
Add 273 as 0c= 273k
What is a synthesis/ combination reaction?
Complex compound formed from simpler inputs
X+ y→ xy
What is a decomposition reaction?
Compound is broke into simpler compounds/atoms
Xy → x+ y
What is a combustion reaction?
Compound with C, h & sometimes O (organisation compound) reacts with O2 to form H2O & Co 2
What is formed during a combustion reactions?
H20 & co2
What is a displacement/single replacement reaction?
More reactive element displace less reactive elements
X+ yz → xy+ z if x is more reactive than z
What is a exchange/ double replacement reaction?
2 replacements
Ax + ay → ay + bx
Formula for rate of reaction
Google answer
What lowers activation energy
Catalyst
Is the catalyst consumes by the reaction?
No
What is a disproportionation reaction?
A reaction where a compound undergoes both oxidation & reduction
What is the change in enthalpy?
The heat that is transferred under constant pressure
What is an endothermic reaction?
When energy goes into the system & change in enthalpy is positive
What is an exothermic reaction?
When energy goes into the surroundings & change in enthalpy is negative
What is the unit of rate of reaction?
M/s (molar/s)
Rate of reaction =?
Rate = change in concentration / change in time
What is the only thing that can change an equilibrium constant?
Increase or decrease in temperature
What is a disproportionation reaction?
A reaction where the same element is both oxidised & reduced
