CHE-109-Fall-2019-Exam-3-W_Key

Combine the oxidation half reaction and the reduction half reaction to obtain an overall oxidation- reduction reaction, in each of the following questions. oxidation half reaction Ni → Ni2+ + 2e- reduction half reaction 2Ag+ + 2e- → 2Ag Overall reaction: ______________________________________________________

When the voltaic cell reaches equilibrium, ____________ .   a. E = K      b. E =0       c. ECELL =0 d. ECELL = Q

In a galvanic cell, oxidation takes place at the _______ which is ________.  1. Any electrode, anode, cathode  2. uncharged, positively charged, negatively charged.

Balance the redox reduction then answer the ff. question Zn + Cl2 > ZnCl2 1.  What is the change in oxidation number per atom of Zn? 2. What is the change in oxidation number per atom of Cl? 3.  What is the number of atoms of Cl in one of the reactants? 4.  What is the total number of electrons transferred (gained by the OA/lost by the RA) in the reaction?

1.) When the cell reaches equilibrium conditions, it is ____________________

Pa answer po please

Balance this redox reduction then answer the ff questions.  Mg + CuCl2 > MgCl2 + Cu 1. What is the change in oxidation number per atom of Mg (product side - reactant side)? 2. Which atom underwent change in CuCl₂? 3. What is the change in oxidation number per atom of the atom that underwent change in CuCl₂?

A solution with a pOH of 5.55 has an [OH–] of __________

The electrode at which _________ occurs is called the cathode and the electrode where the ____________ occurs is called the anode Oxidation, neutralization Reduction, neutralization Reduction, oxidation Oxidation ,reduction

3 and 4 please

XPERIMENT 8 Data Sheet - Word Table Tools crences Mailings Review View ACROBAT Design Layout Tell me what you want to de Aa - -E. E. E= AaBbCcD AaBbCcD AaBbC AaBbCcC Aa I Normal 1 No Spac. Heading 1 Heading 2 - ay. A- Title Styles DATA SHEET Part I-A Qualitative Redox Table for Copper, Zinc, Iron, and Their Ions 1. Write net ionic equations for any reactions taking place between the solid metals and metal ions listed below. If there is a visible reaction, the solid metal will form their corresponding 2+ cation. If there is no visible evidence of reaction, write NR for "no reaction." Copper metal and zinc ion: Copper metal and iron(I) ion: Iron metal and copper(II) ion: Irọn metal and zinc ion: Zinc metal and copper(I) ion: Zinc metal and iron(II) ion: 2. Which metal is the stronger reducing agent: a. Copper or zinc? b. Iron or copper? C Iron or zinc? In the box at the right, construct a redox couple table for iron, copper, Zinc, and their ions. Arrange the three metals in a column at…

13 What is the number of Faraday of charge needed to deposit 2.6x10-3 moles of Al+3 ions from its solution?   A. 2.6x10-3 B. 2.6x10-6 C. 5.2x10-5 D. 7.8x10-3

Which one of the following statements is true? Select all that apply. A. B. 5 poin An electrolytic cell does not require external voltage to operate. Reduction occurs at the cathode in a galvanic cell. C.Oxidation occurs at the anode in a galvanic cell but not in an electrolytic cell. D.Oxidation occurs at the cathode in an electrolytic cell. E. When a galvanic cell is recharged, the reverse chemical reaction occurs as when the galvanic cell operates.

10-please fast The oxidation number for nitrogen in Ba(NO3)2is: Select one: a. +1 b. -3 c. +5 d. +3

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need both parts soon

Please don't provide handwriting solution

One activity lang po to kaya I would consider this one question with sub-parts. Sana po masagot. Maraming salamat!

KMnO4 + HCl           KCl + MnCl2 + Cl2 + H2O Use the above Redox Equation. What is the oxidation number of Cl in Cl2? Question 9 options:   a.   0 +1   b. +1   c. -1   d. -2

__________ is an oxidation reaction. Group of answer choices Table salt dissolving in water for cooking vegetables The reaction of sodium chloride with lead nitrate to form lead chloride and sodium nitrate Rusting of iron Neutralization of HCl by NaOH Ice melting in a soft drink

For a redox reaction, the substance being reduced is called the ______ agent

Add the appropriate chemicals so that the following redox equations are balanced. Add H2O if needed.  a. acidic solution ___ MnO4- + ___ HS- -> ___ S + ___ MnO2  b. basic solution ___ Br2 + ___ SO2 -> ___ SO42- + ___ Br-

What is the oxidation number of Cl in Ca(ClO4)2? Select one: a. 7+  b. 2+ c. 1- d. 5+

A.________ describes the use of electricity to drive B.________ chemical reactions.   Possible Solutions for part A: discharging, electrolysis, corrosion, electrochemistry   Possible Solitions for part B: Spontaneous, nonspontaneous, and spontaneous and nonspontaneous

Electrode in an electrochemical cell at which reduction occurs is referred to as ________________. a. the anode b. the salt bridge c. the voltmeter d. none of these e. the cathode

Activity 2. Answer the following questions a. How long does it take an iron nail exposed to the rain to rust?______________________________________________________________________________ b. Compare the rusting of iron to how fast milk curdles when an acid like vinegar or calamansi juice is added to it. (Try doing this at home if you have milk, vinegar or calamasi juice.) ______________________________________________________________________________ c. Do you think you could light a log with a single matchstick? How about twigs or smaller pieces of wood? ______________________________________________________________________________ d. Why do we keep food in the refrigerator? ______________________________________________________________________________ e. How do particles move at high temperatures compared at low temperatures? __________________________________________________________________________

Which of the following is the strongest oxidant? a. Li b. O2 c. H2 d. F2

An electrolytic cell has a _______ Gibb's energy changes and             ____ a current to do work.   Positive or Negative?   Produce or Required?

When the skeleton oxidation-reduction equation     MnO4- + Br- ---------> Br2 + Mn2+is balanced in  ACIDIC solution using the smallest whole number coefficients, the coefficient of Br- is:_______ a.5 b.2 c.10 d.12