Electrochemistry

Electrochemistry is

• Study of electron in atom

• Study of electricity in molecules

• The relationship between chemical reactions and electricity

• the study of electrons moving from one a tom to another

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NGSS.HS-PS3-5

An oxidizing agent will

• increase in mass

• lose electrons

• be reduced

• increase in oxidation number

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Pb + 2Ag⁺ → Pb⁺² + 2Ag

The chemical species being reduced is

• Ag

• Pb

• Pb⁺²

• Ag⁺

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NGSS.HS-PS1-2

What reaction occurs at the anode?

• Ag⁺ + e^- →Ag
• Ag → Ag⁺ + e^-
• Ni²⁺ + 2e^- → Ni
• Ni → Ni²⁺ + 2e^-

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NGSS.HS-PS1-2

What unit of measurement do we use to measure electrical potential?

• Watts
• Volts
• Amps
• Ohms

In a galvanic cell with the following cell notation:

 $\left|Ni\left(s\right)\right|Ni^{+2}\left(aq\right)\parallel Co^{+2}\left(aq\right)\left|Co\left(s\right)\right|$  

Which of the following is true?

• Ni is being reduced

•  $Co^{+2}\ is\ being\ oxidized$  

• Energy will be added to operate this cell.

• This cell operated spontaneously

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NGSS.HS-PS1-2

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In electrochemical cell Anode is of which charge

• –ve

• +ve

• No charge

• Both charge

In electrochemical cell, reduction takes place at

• Right

• Left

• Top

• Bottom

When aqueous copper(II) chloride solution is electrolysed using copper electrodes, the half-equation for the reaction that occurs at the anode is

• Cu²⁺ + 2e -------> Cu

• Cu --------> Cu²⁺ + 2e

• 2Cl^- --------> Cl₂ + 2e

• 4OH^- --------> 2H₂O + O₂ + 4e

What are the cations present in zinc sulphate solution?

• Zn²⁺

• Zn²⁺, SO₄²

• Zn²⁺ , H⁺

• OH^- , SO₄^2-