Name:………………
Fall 2016
Knowledge
/ 10 Toronto High School
SCH4U-Assignment #4
Communication
Application
/6 Ms. S. Nikoudad
Total Mark
/ 14 / 30 Knowledge: [……………/10] 1. The oxidation number of carbon in C2O42- is
A) +3 B) +4 C ) +5 D) +6 2. Consider the following reaction: 3As2O3 + 4NO3- + 7H2O → 6H3AsO4 + 4NO
The oxidizing agent is
A) H+ C) NO3- B) H2O D) AsO3 3. Which of the following represents a redox reaction?
A) H2CO3 → H2O + CO2 B) CuS + H2 → H2S + Cu C)AgNO3 + NaCl → AgCl + NaNO3 D) 2HCl + Na2SO3 → 2NaCl 4.An oxidizing agent will cause which of the following changes?
A) PtO2 → PtO B) PtO3 → PtO2 D) Pt(OH)22+ → PtO3 C) Pt(OH)2 → Pt 5. The following represents the process used to produce iron from iron III oxide:
Fe2O3 + 3CO → 2Fe + 3CO2
A. Fe What is the reducing agent in this process? B. CO C. CO2 D. Fe2O3 +
6. Consider the following reaction: 2HNO2 + 2I + 2H → 2NO + I2 +2H2O The oxidation number for each
nitrogen atom
a. increases by 1 b. increases by 2 c. decreases by 1 d. decreases by 2 7. Which of the following is not a redox reaction?
a. Cu + Br2→ CuBr2
c. CH4 +H2O → CO2 + 2H2O b. CO + H2O → CO2 + H2
d. NaOH + HCl → NaCl + H2O 8. Which of the following half-reactions are balanced?
a. ClO +H2O+e →Cl2 +2OH b. 2ClO +H2O+2e →Cl2 +3OH c. 2ClO +2H2O+2e →Cl2 +4OH d. 2ClO +2H2O→Cl2 +4OH +2e 2+
9.When MnO4 reacts to form Mn , the manganese in MnO4 is
a. reduced as its oxidation number increases b. reduced as its oxidation number decreases c. oxidized as its oxidation number increases d. oxidized as its oxidation number decreases 10. Electrons are lost by the
A. reducing agent as it undergoes oxidation. B. reducing agent as it undergoes reduction. C. oxidizing agent as it undergoes oxidation. D. oxidizing agent as it undergoes reduction. Communication: […………./6] 1- Consider the following redox reaction: (6)
3As2O3 + 4NO3 + → 6H3AsO4 + 4NO
a) Identify each half reaction, including electrons.
b) Identify the oxidizing and reducing agents. Application:
1.
a) […………./14] Balance the following redox reaction in basic solution using half reaction method : (………./8)
Au + - Cl + O2 → AuCl4 - + OH - b) 2MnO4 + C2O4 → MnO2 + CO2 2- Balance the following redox reaction in acidic solution using half reaction method : 3+
2a)
O2 +
Cr
→
H2 O2
+
Cr2O7 b) As → H2AsO4 - + AsH3 (………./6)

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