28 Ch19-1 ElectrochemicalCells1

28 Ch19-1 ElectrochemicalCells1 - Which one of the...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Which one of the statements A - D is not correct? If all are correct, respond E. A) Two solutions that are isotonic have the same number of solute particles. B) Hypo means low; hyper means high. C) Osmosis refers to movement of solvent through a membrane from a region of low solute concentration to region of high solute concentration. D) As a result of osmosis, cells placed in a hypotonic solution will burst, and cells placed in a hypertonic solution will shrivel up. E) The statements A – D all are correct. 2 Chapter 19 Electrochemistry Lec 28, pp. 920 – 937 Batteries Aka electrochemical, voltaic, or galvanic cells. Oxidation reduction reactions (redox) Half-reactions Oxidation numbers: Review MSJ pp. 179 - 187 Balancing redox eqs Homework QRT Ch 19: 6, 10, 12,14, 22
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3 A battery produces usable energy in a way that is similar to a waterfall. h E V = m g h G = n F E Change in potential energy = mass of water x gravitational constant x height difference Change in free energy = moles of e - x Faraday’s constant x voltage difference 4 What is the source of an electrical current from a battery? One chemical reaction produces electrons Zn(s) Zn 2+ (aq) + 2e - Another reaction consumes electrons 2Ag + (aq) + 2e - 2Ag(s) an oxidation reaction a reduction reaction Why reduction? The positive charge gets reduced!
Background image of page 2
5 Zn(s) Zn 2+ (aq) + 2e - 2Ag + (aq) + 2e - 2Ag(s) The oxidation and reduction reactions occur in different compartments of the battery. The electrons must flow thorough an external
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

28 Ch19-1 ElectrochemicalCells1 - Which one of the...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online