Redox
What happens to the electrons of an atom being oxidized and something being reduced?
Oxidation loses electrons. Reduction gains electrons.
Write the balanced reaction with state symbols for the following AND classify the type of reaction:
Ethane (C2H4) is burned in air.
C2H4(g) + 3O2(g) -> 2CO2(g) + 2H2O(g)
combustion
Write the balanced reaction with state symbols for the following AND classify the type of reaction:
Mercury (II) reacts with iodine.
Hg(l) + I2(g) -> HgI2(s)
synthesis
Balance the following reaction AND classify the type of reaction:
_Na (s) + _P (s) -> _Na3P (s)
3, 1, 1
synthesis
What are two ways to know a chemical change has occures?
Formation of a solid, formation of a gas, or color change
What is the oxidation number of Cl in HClO4?
+7
Write the balanced reaction with state symbols for the following AND classify the type of reaction:
Sodium oxide is added to hydrogen.
Na2O(s) + H2(g) -> no reaction
single replacement
Write the balanced reaction with state symbols for the following AND classify the type of reaction:
Pentane (C5H12) is burned in insufficient oxygen.
2C5H12(g) + 11O2(g) -> 10CO(g) + 12H2O(g)
combustion
Balance the following reaction AND classify the type of reaction:
_KOH(aq) + _NiCl2 (aq) -> _Ni(OH)2 (s) + _KCl (aq)
2,1,1,2
double replacement
Write an equation that includes all of the information in this statement: Two moles of solid aluminum react with 3 moles of aqueous sulfuric acid to produce 1 mole of aqueous aluminum sulfate and 3 moles of hydrogen gas.
2Al (s) + 3H2SO4 (aq) -> Al2(SO4)3 (aq) + 3H2 (g)
Is this reaction REDOX or NONREDOX? Give evidence using oxidation numbers.
Cl2 (g) + 2Li (s) -> 2LiCl (s)
REDOX
Cl 0 -> -1 reduced
Li 0 -> +1 oxidized
Write the balanced reaction with state symbols for the following AND classify the type of reaction:
Aluminum bromide is heated.
2AlBr3(s) -> 2Al(s) +3Br2(l)
decomposition
Write the balanced reaction with state symbols for the following AND classify the type of reaction:
Rubidium is added to aqueous copper (II) sulfate
2Rb(s) + CuSO4(aq) -> Cu(s) + Rb2SO4(aq)
single replacement
Balance the following reaction AND classify the type of reaction:
_Na (s) + _H2O (l) -> _NaOH (aq) + _H2 (g)
2, 2, 2, 1
single replacement
Describe what evidence of a chemical change you would see if you were watching the reaction below:
Two moles of solid aluminum react with 3 moles of aqueous sulfuric acid to produce 1 mole of aqueous aluminum sulfate and 3 moles of hydrogen gas.
solid Al disappears, bubbles (formation of a gas)
Which substance is reduced in this reaction? Give evidence using oxidation numbers.
2FeCl3(aq) + 2KI(aq) -> 2FeCl2(aq) + 2KCl(aq) + I2(s)
Fe +3 -> +2
(reduced is gaining electrons, becoming more negative)
Write the balanced reaction with state symbols for the following AND classify the type of reaction:
Potassium oxide is mixed with water.
K2O(s) + H2O(l) -> 2KOH(aq)
synthesis
Write the balanced reaction with state symbols for the following AND classify the type of reaction:
Aqueous magnesium chlorate reacts with carbonic acid
Mg(ClO3)2(aq) + H2CO3(aq) -> MgCO3(s) + 2HClO3(aq)
double replacement
Balance the following reaction AND classify the type of reaction:
_PBr3 (l) -> _P4 (s) + _Br2 (l)
4,1,6
decomposition
What are the state symbols for the following reaction?
Co + 2HCl -> CoCl2 + H2
s, aq, aq, g
Which substance is oxidized in this reaction? Give evidence using oxidation numbers.
2FeCl3(aq) + 2KI(aq) -> 2FeCl2(aq) + 2KCl(aq) + I2(s)
I -1 ->0
(oxidized is losing electrons, becoming more positive)
Write the balanced reaction with state symbols for the following AND classify the type of reaction:
Aqueous gallium bromide is mixed with aqueous lead (II) chlorate
2GaBr3(aq)+3Pb(ClO3)2(aq) -> 3PbBr2(s)+2Ga(ClO3)3(aq)
double replacement
Write the balanced reaction with state symbols for the following AND classify the type of reaction:
Aluminum carbonate is heated.
Al2(CO3)3(s) -> Al2O3(s) + 3CO2 (g)
decomposition
Balance the following reaction AND classify the type of reaction:
_C6H6 (g) + _O2 (g)-> _CO2 (g) + _H2O (g)
2, 15, 12, 6
combustion
The following reaction will NOT occur spontaneously. In terms of potential energy of the reactants and products, explain why the reaction will NOT be spontaneous and rather yield No Reaction:
CaSO4 (s) + 2NaCl (aq) ->Na2SO4 (aq) + CaCl2 (aq)
The products are higher in potential energy than the reactants. Solids are lower in potential energy. The products must be lower in potential energy for the reaction to occurs spontaneously.