Quiz | Chemical Reactivity
What is the net ionic equation of: MnCl2 (aq) + (NH4)2CO3 (aq) → MnCO3 (s) + 2 NH4Cl (aq)?
Cl- (aq) + NH4+ (aq) → NH4Cl (aq)
Mn2+ (aq) + CO32- (aq) → MnCO3 (s)
MnCl2 (aq) + (NH4)2CO3 (aq) → 2 NH4Cl (aq)
Mn2+ (aq) + CO32- (aq) + 2 Cl- (aq) + 2 NH4+ (aq) → MnCO3 (s) + 2 Cl- (aq) + 2 NH4+ (aq)
A net ionic equation only shows the ions that form a solid, so here MnCO3
What is a Bronsted base?
A H+ acceptor
A H+ donor
An electron pair acceptor
An electron pair donor
A Brönsted base is a substance that can accept a proton (H+ acceptor)
Which of the following compounds is not a Lewis base?
H2O
NH3
HO-
AlCl3
A Lewis base is an electron-pair donor and so must have a lone pair of electrons
What is the oxidation number of the carbon atom in H2CO3?
0
+2
+4
+8
Charge of H2CO3 = 0 = Oxidation Number (O.N.) of C + 2 O.N. of H + 3 O.N. of O
O.N. of H = +1 and O.N. of O = -2
0 = O.N. of C + 2 x 1 + 3 x (-2) ⇒ O.N. of C = +4
What is the reducing agent in the reaction: Fe2O3 + 3 CO → 2 Fe + 3 CO2?
CO
CO2
Fe
Fe2O3
A reducing agent is a substance that is oxidized in a redox reaction
CO (oxidation number of C: +2) becomes CO2 (oxidation number of C: +4) ⇒ CO is oxidized since the oxidation number of the carbon atom increases
What kind of reactions is: 2 Ag (s) + H2S (aq) → Ag2S (s) + H2 (g)?
Combination
Decomposition
Single replacement
Double replacement
A single replacement reaction is a chemical reaction in which one element is replaced by another in a compound