R-3 Redox Reactions Flashcards
What is the oxidation number of all of the atoms in the following species?
Ar
0
Note: All elements have an oxidation number of 0
What is the oxidation number of all of the atoms in the following species?
CH4
C-4
H+1
Note: Start with the hydrogen is +1 rule then use the compounds have a 0 oxidation number in order to determine the oxidation number of carbon.
What is the oxidation number of all of the atoms in the following species?
AlH3
Al+3
H-1
Note: Metal hydrides are an exception to the hydrogen is +1 rule
What is the oxidation number of all of the atoms in the following species?
SiO2
Si+4
O-2
Note: Start with the oxygen is -2 rule then use the compounds have an oxidation number of 0 rule in order to determine the oxidation number of silicon.
What is the oxidation number of all of the atoms in the following species?
OF2
O+2
F-1
Note: This is an exception to the O is -2 rule.
What is the oxidation number of all of the atoms in the following species?
H2
0
Note: All elements have an oxidation number of 0
What is the oxidation number of all of the atoms in the following species?
Fe3+
Fe+3
Note: All ions have an oxidation number equal to their charge. When writing a charge the sign goes after the charge number (Fe3+). When writing an oxidation number the sign goes before the charge number (Fe+3)
What is the oxidation number of all of the atoms in the following species?
N3-
N-3
Note: All ions have an oxidation number equal to their charge. When writing a charge the sign goes after the charge number (N3-). When writing an oxidation number the sign goes before the charge number (N-3)
What is the oxidation number of all of the atoms in the following species?
AlN
Al+3
N-3
Note: All ions have an oxidation number equal to their charge.
What is the oxidation number of all of the atoms in the following species?
Cu2S3
Cu+3
S-2
Note: All ions have an oxidation number equal to their charge and compounds have an oxidation number of 0. Most transition metals can have multiple oxidation states so start with the sulfur (-2) so that you can infer the charge of the copper.
What is the oxidation number of all of the atoms in the following species?
CaCO3
Ca+2
C+4
O-2
Note: All ions have an oxidation number equal to their charge (Ca+2), oxygen is -2 rule and compounds have an oxidation number of 0 will allow you to infer the oxidation number of the carbon atom.
What is the oxidation number of all of the atoms in the following species?
Ni2(SO4)3
Ni+3
S+6
O-2
Note: All ions have an oxidation number equal to their charge so the oxidation number of the sulfate is -2. Since oxygen is -2 the sulfur must be +6 to leave a -2 oxidation number for the sulfate. Since all compounds have an oxidation number of 0 the nickle must be +3.
What is the oxidation number of all of the atoms in the following species?
CaO2
Ca+2
O-1
Note: All ions have an oxidation number equal to their charge so the oxidation number of the calcium is +2. The other ion is the peroxide ion and the oxygens in peroxide have an oxidation number of -1.
What is the oxidation number of all of the atoms in the following species?
C2H5OH
C-2
O-2
H+1
Note: The oxidation number of hydrogen is +1 and the oxidation number of oxygen is -2. This means that the oxidation number of carbon must be -2 since the oxidation number of a compound must be a 0.
What is the oxidation number of all of the atoms in the following species?
S8
0
Note: Sulfur is an element so the oxidation number is 0.
What is the oxidation number of all of the atoms in the following species?
NaN3
Na+1
N-1/3
Note: We will not see it too much but oxidation numbers can be fractional.
What is the oxidation number of all of the atoms in the following species?
NaN3
Na+1
N-1/3
Note: We will not see it too much but oxidation numbers can be fractional.
Is the following a redox reaction or not?
Na2O (s) + H2O (l) ⇒ 2 NaOH (aq)
Not
Is the following a redox reaction or not?
SO3 (g) + H2O (l) ⇒ H2SO4 (aq)
Not
Is the following a redox reaction or not?
Na2SO3 (aq) + 2 HCl (aq) ⇒ 2 NaCl (aq) + SO2 (g) + H2O (l)
Not