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Questions and Answers
Which of the following is an example of a redox reaction?
Which of the following is an example of a redox reaction?
- CuO (S) + H2 (g)→ Cu(s)+ H2O(l)
- Zn( s) + CuSO4( aq) → ZnSO4 (aq) + Cu(s) (correct)
- NaCl + H2O → NaOH + HCl
- Na(s)+2HCl(aq)→2NaCl(aq)+H2(g)
What is the reducing agent in the reaction Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)?
What is the reducing agent in the reaction Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)?
- CuSO4
- Cu
- ZnSO4
- Zn (correct)
What is the oxidation number of chlorine in HCl?
What is the oxidation number of chlorine in HCl?
- +1
- +2
- -2
- -1 (correct)
What is the molar mass of NaCl?
What is the molar mass of NaCl?
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If you have 117 g of NaCl dissolved in 300 ml of solution, what is the concentration of the solution?
If you have 117 g of NaCl dissolved in 300 ml of solution, what is the concentration of the solution?
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Study Notes
Redox Reactions
- A redox reaction is a type of reaction that involves the transfer of electrons between two species, resulting in a change in oxidation state.
Zinc and Copper Sulfate Reaction
- The reaction Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s) is an example of a redox reaction.
- In this reaction, Zn(s) is the reducing agent, as it loses electrons to form Zn2+ ions.
Oxidation Numbers
- The oxidation number of chlorine in HCl is -1.
Molar Mass
- The molar mass of NaCl is 58.44 g/mol.
Concentration of a Solution
- If 117 g of NaCl is dissolved in 300 ml of solution, the concentration of the solution can be calculated using the formula: concentration = mass of solute / volume of solution.
- The concentration of the solution would be approximately 1.96 M (moles per liter).
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