Redox Reaction Lab
INVESTIGATION
12.A
Target Skills
Determining the reactivity of various metals
Testing Relative Oxidizing and Reducing
Strengths of Metal Atoms and Ions
By observing whether reactions occur between solid metals and metal ions in solution, you can determine the order of oxidizing and reducing agents according to strength. Question
How can the presence or absence of a reaction provide information about the relative strength of oxidizing and reducing agents?
Safety Precautions
•
Wear goggles, gloves, and an apron for all parts of this investigation. •
If you spill any solution on your skin, wash it off with large amounts of water.
•
Wash your hands when you have completed the investigation. Materials
• 4 small pieces …show more content…
If the oxidation number of an atom decreases in a reaction, it indicates a gain of electrons.
•
You can balance an equation by finding the coefficients that make the number of electrons lost by one atom of one element equal to the number of electrons gained by atoms of another element. You then balance the rest of the equation by inspection.
SECTION 12.3 REVIEW
1. Determine whether each of the following reactions is a redox reaction:
a) H2(g) + I2(s) → 2HI(aq)
b) 2NaHCO3(aq) → Na2CO3(aq) + H2O( ) + CO2(g)
c) 2HBr(aq) + Ca(OH)2(s) → CaBr2(aq) + 2H2O( )
d) PCl5( ) → PCl3( ) + Cl2(g)
2. Write three different definitions for a redox reaction.
3. Explain why fluorine has an oxidation number of −1 in all its compounds other than fluorine gas, F2(g).
4. When atoms of one element combine with atoms of another element, is the reaction a redox reaction?
Explain your answer.
5. a) Use the oxidation number rules to find the oxidation number of sulfur in a thiosulfate ion, S2O32−(aq).
b) The Lewis structure of a thiosulfate ion is given here. Use the Lewis structure to find the oxidation number of each sulfur atom.
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12.A
Target Skills
Determining the reactivity of various metals
Testing Relative Oxidizing and Reducing
Strengths of Metal Atoms and Ions
By observing whether reactions occur between solid metals and metal ions in solution, you can determine the order of oxidizing and reducing agents according to strength. Question
How can the presence or absence of a reaction provide information about the relative strength of oxidizing and reducing agents?
Safety Precautions
•
Wear goggles, gloves, and an apron for all parts of this investigation. •
If you spill any solution on your skin, wash it off with large amounts of water.
•
Wash your hands when you have completed the investigation. Materials
• 4 small pieces …show more content…
If the oxidation number of an atom decreases in a reaction, it indicates a gain of electrons.
•
You can balance an equation by finding the coefficients that make the number of electrons lost by one atom of one element equal to the number of electrons gained by atoms of another element. You then balance the rest of the equation by inspection.
SECTION 12.3 REVIEW
1. Determine whether each of the following reactions is a redox reaction:
a) H2(g) + I2(s) → 2HI(aq)
b) 2NaHCO3(aq) → Na2CO3(aq) + H2O( ) + CO2(g)
c) 2HBr(aq) + Ca(OH)2(s) → CaBr2(aq) + 2H2O( )
d) PCl5( ) → PCl3( ) + Cl2(g)
2. Write three different definitions for a redox reaction.
3. Explain why fluorine has an oxidation number of −1 in all its compounds other than fluorine gas, F2(g).
4. When atoms of one element combine with atoms of another element, is the reaction a redox reaction?
Explain your answer.
5. a) Use the oxidation number rules to find the oxidation number of sulfur in a thiosulfate ion, S2O32−(aq).
b) The Lewis structure of a thiosulfate ion is given here. Use the Lewis structure to find the oxidation number of each sulfur atom.
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