ELECTRO CHEMISTRY Lecture Notes - Lecture 2: Electrochemistry, Manganese Dioxide, Direct Methanol Fuel Cell

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astrodabber

2 Mar 2023

School

Delhi Technological University

Department

Earth Science

Course

ELECTRO CHEMISTRY

Professor

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Document Summary

Redox reactions play a crucial role in electrochemistry. Electrochemistry is the branch of chemistry that deals with the relationship between electricity and chemical reactions. Redox reactions involve the transfer of electrons between reactants and are essential in the conversion of chemical energy into electrical energy or vice versa. In this study note, we will provide a detailed overview of redox reactions in electrochemistry, including their definition, types, and applications. Redox reactions are chemical reactions in which there is a transfer of electrons between reactants. The term "redox" is a contraction of "reduction-oxidation. " In a redox reaction, one reactant undergoes oxidation (loses electrons), while the other reactant undergoes reduction (gains electrons). The electrons that are lost by the oxidized reactant are gained by the reduced reactant. There are two main types of redox reactions: oxidation-reduction reactions and half-reactions: oxidation-reduction reactions: Oxidation-reduction reactions, also known as redox reactions, involve the transfer of electrons between reactants.

Related Questions

Walking converts what type of energy into mechanical energy?

A) chemical

B) electromagnetic

C)nuclear

D) thermal.

roseox777

Part B: True or False?

* Determine if each statement is true (T) or false (F).

12. _______ An element cannot be broken down into simpler chemical substances by any physical or chemical means.

13. _______ If an element is a gas at room temperature, it is likely to be a metal.

14. _______ Elements in the same period of the Periodic Table have varying (different) properties.

15. _______ Hydrogen is a clear, colourless gas that is highly reactive. Based on these properties, Hydrogen is

similar to the Halogens.

16. _______ The element Iodine is a shiny black solid at room temperature. Iodine is thus an example of a metal.

17. _______ Electrical advertising signs made of colourful glowing light tubes are often filled with elements from the

halogen family.

18. _______ John Dalton proposed the idea of indivisible atoms.

19. _______ Experiments by J.J. Thomson showed that atoms contain neutrons.

20. _______ An atom with 16 protons, 16 electrons and 18 neutrons has a mass number of 50.

21. _______ Elements in group 15 of the periodic table all have 15 valence electrons.

22. _______ Chlorine has electrons in 3 energy levels.

23. _______ When copper is added to tin, the alloy bronze is created. Bronze is an example of a compound.

Part B: True or False? (K – 12 marks)

* Determine if each statement is true (T) or false (F).

12. _______ An element cannot be broken down into simpler chemical substances by any physical or chemical means.

13. _______ If an element is a gas at room temperature, it is likely to be a metal.

14. _______ Elements in the same period of the Periodic Table have varying (different) properties.

15. _______ Hydrogen is a clear, colourless gas that is highly reactive. Based on these properties, Hydrogen is

similar to the Halogens.

16. _______ The element Iodine is a shiny black solid at room temperature. Iodine is thus an example of a metal.

17. _______ Electrical advertising signs made of colourful glowing light tubes are often filled with elements from the

halogen family.

18. _______ John Dalton proposed the idea of indivisible atoms.

19. _______ Experiments by J.J. Thomson showed that atoms contain neutrons.

20. _______ An atom with 16 protons, 16 electrons and 18 neutrons has a mass number of 50.

21. _______ Elements in group 15 of the periodic table all have 15 valence electrons.

22. _______ Chlorine has electrons in 3 energy levels.

23. _______ When copper is added to tin, the alloy bronze is created. Bronze is an example of a compound.

Atomic #

Mass #

Standard Atomic

Notation

Family Name

jhonny

1. Which of the following elements would have similar properties to Sulfur?

a. Chlorine b. Argon c. Aluminum d. Oxygen

2. Which element is likely to react violently with water (Hint: think back to the demo you saw!)?

a. Beryllium b. Carbon c. Caesium d. Sulfur

3. Which element is most likely to be a clear, colourless, odourless gas that is unreactive?

a. Fluorine b. Krypton c. Nitrogen d. Hydrogen

4. Which statement is correct?

a. Be is more reactive than Li c. O is more reactive than F

b. Kr is more reactive than Br d. Ra is more reactive than Be

5. Which of the following are true about the Alkaline Earth metals?

a. They all have 2 electrons in their valence shell

b. They are the most reactive group of metals

c. They burn with bright colourful flames, and are used in fireworks

d. All of the above are true

e. Only a. and c. are true

6. Rutherford’s gold foil experiment showed that…

a. electrons do not surround the nucleus in a random cloud, but rather in organized orbitals

b. atoms have a tiny, positively charged nucleus

c. electrons crowd tightly together at an atom’s centre

d. atoms contain neutrons

7. Which determines the identity of an atom?

a. the sum of protons and neutrons c. number of neutrons

b. number of protons in the nucleus d. its driver’s license

8. If an atom has six protons, six electrons, and eight neutrons it must be an isotope of…

a. carbon b. silicon c. oxygen d. magnesium

9. An atom has a mass number of 20 and it contains 10 neutrons. What element must it be?

a. calcium b. neon c. zinc d. More information is needed.

10. Which of the following statements is correct?

a. Protons and electrons are located in the nucleus of an atom.

b. All atoms of the element lithium will have 4 neutrons.

c. The energy level closest to the nucleus is the valence shell.

d. Two atoms of the same element can have different numbers of neutrons.

11. Which phrase best describes a group or family in the periodic table?

a. Elements that have the same melting point.

b. Elements that have the same number of electrons in their outermost orbits.

c. Elements in the same group all have the same number of orbitals/energy levels.

d. Elements that are in the same row.

jhonny

ELECTRO CHEMISTRY Lecture Notes - Lecture 2: Electrochemistry, Manganese Dioxide, Direct Methanol Fuel Cell

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