Kaplan General Chemistry: Oxidation and Reduction Reactions

Question 1

Random physics Q: velocity and frequency of wave in open and closed pip

Answer 1

open pipe:
v=2L/n
f = nv/2L

closed pipe:
v=4L/n
f= nv/4L

Question 2

halides have an oxidation number usually of -1. when does this NOT happen

Answer 2

except when they are combined with an element of higher electronegativity.

ex/ Hcl, cl has an oxidation number of -1. HOcl however, the oxidation number is +1, because O will be -2.

Question 3

When does oxygen have an oxidation number that isn’t -2?

Answer 3

in peroxides. O will have -1.

also when paired with a more electronegative element (ex/ OF2), O has a +2 charge.

Question 4

hydrogen usually has an oxidation number of +1 besides:

Answer 4

when it is paired with a 1A or 2A element Ex/ NaH –> H=+1

Question 5

oxidation state and its relation to acidity

Answer 5

the HIGHER the oxidation state, the more acidic a compound is.

Question 6

why is transition metal oxidation usually accompanied by color change?

Answer 6

oxidation color change can be the result of different d orbital shells being filled differently upon electron loss or gain.

Question 7

T/F double displacement reactions are oxidation reduction reactions

Answer 7

false. they are often NOT oxidation reduction reactions because all ions generally retain their oxidation state.

Question 8

catalase, an enzyme which converts H2O2 to water and O2, is an example of:

Answer 8

a disproportionation reaction. a redox reaction where an element undergoes both oxidation and reduction.

Question 9

a ____ titration is a form of redox titration where no indicator is used. instead electrical potential difference is measured using a voltmeter

Answer 9

potentiometric titration.