ELECTROCHEMISTRY

a branch of chemistry that deals with the interconversion of electrical energy and chemical energy

(a)  

which is NOT a property of electrochemical processes?

• they are redox reactions

• the energy released by a spontaneous reaction is converted to electricity

• chemical energy is used to create a non-spontaneous reaction to occur

• can either be spontaneous or non-spontaneous

oxidation - LOSS of electrons

reduction - GAIN of electrons

• T T

• F F

• T F

• F T

REPLACE ITALICIZED WORDS TO MAKE THE STATEMENT CORRECT:

REDOX reaction involves shifting of electrons

(a)  

COMPLETE THE STATEMENT:

Since, electrons are ______ charged, an atom that is oxidized will have a/an ______ in its ______ number and an atom that is reduced will have a/an ______ in its ______ number.

• positively ; increase ; reduction; decrease ; oxidation

• positively ; decrease ; oxidation ; increase ; oxidation

• negatively ; decrease ; oxidation ; increase ; reduction

• negatively ; increase ; oxidation ; decrease ; oxidation

CONSIDER THE REACTION BELOW:

What happened to the Magnesium?

(a)  

CONSIDER THE REACTION BELOW:

What happened to the Oxygen?

(a)  

Each of the two half-processes cannot happen independently without the other half-process.

• TRUE

• FALSE

Another name for "oxidation number"

(a)  

The 2 steps in assigning oxidation number are:

1. Count the number of electrons lost/gained by a product.

2. Identify the atom reduced and the atom oxidized.

• T F

• F T

• T T

• F F