Chem #11

Question 1

LEO GER

Answer 1

loses electrons oxidized (+)

gains electrons reduced (-)

Question 2

oxidation-reduction reactions

Answer 2

always occur in pairs and focus on the movement of electrons.
o Involve the transfer of electrons from one chemical species to another.

Question 3

law of conservation of charge

Answer 3

electrical charge can neither be created nor destroyed.

Question 4

oxidation

Answer 4

loss of electrons

Question 5

oxidizing agent

Answer 5

causes another atom in a redox reaction to be oxidized and is itself reduced.
 Common oxidizing agents contain oxygen or similar electronegative element

Question 6

reducing agent

Answer 6

causes another atom in a redox reaction to be reduced and is itself oxidized.
 Common reducing agents contain metal ions or hydrides (H-)

Question 7

reduction

Answer 7

gain of electron

Question 8

specificity about oxidizing agent and reducing agent terminology

Answer 8

These are applied specifically to the atom that loses or gains electrons.

Question 9

changes in oxidation state in transition metal results in ____

Answer 9

change in color

Question 10

how do formal charge and oxidation state differ?

Answer 10

Differ from formal charges in that formal charges assume equal sharing of electrons in a bond whereas oxidation numbers assume unequal sharing with more electrons going to the more EN atom.

Question 11

oxidation numbers

Answer 11

assigned to atoms in order to keep track of the redistribution of electrons during chemical reactions.
 Can look at how many electrons are gained or lost by each atom this way.

Question 12

what is the oxidation # of free element

Answer 12

0

Question 13

if it gets oxidized, it is the ____ agent

Answer 13

reducing agent

Question 14

how to balance a redox reaction

Answer 14

o Both the net charge and the number of atoms must be equal on both sides of the equation.
o Use the half-reaction method: balance the oxidation and reduction reactions separately and then add them together.

Question 15

complete ionic equations

Answer 15

if we split the various species into all of the ions present.

Question 16

spectator ions

Answer 16

inert ions that are present during the reaction but are not taking part in it.

Question 17

net ionic equation

Answer 17

take out spectator ions, aqueous compounds should be split into their constituent ions, but solid salts should be kept as a single entity.

Question 18

disproportionation (dismutation)

Answer 18

a specific type of redox reaction in which an element undergoes both oxidation and reduction in producing its products.
o Biological enzymes that do these reactions and redox reactions often have metals in their active sites that act as reducing agents.

Question 19

oxidation-reduction titrations

Answer 19

o Follow the movement of electrons to reach the equivalence point.
o Use indicators that change color at a particular voltage (emf) value.
o Potentiometric titration: a form of redox titration where no indicator is used. Electrical potential voltage is measured instead.

Question 20

dehydrogenases perform ____

Answer 20

oxidation

Question 21

oxidizing agents oftentimes contain ______

Answer 21

oxygen or strong electronegative element

Question 22

what are the oxidation states of the elements in HOCl

Answer 22

H: +1, O: -2, Cl: +1

O is more EN than Cl

Question 23

what are the oxidation states of the elements in NaH

Answer 23

Na: +1
H: -1

Question 24

what are the oxidation states of the elements in O2^-2

Answer 24

-1

Question 25

what are the oxidation states of the elements in OF2

Answer 25

O: +2
F: -1

Question 26

formal charge vs oxidation number

Answer 26

formal charge assumes equal division of electrons in bonds while oxidation number assumes unequal division of electrons in bonds.

Question 27

what compounds are not broken up when making complete/net ionic equations

Answer 27

anything that is not aqueous

Question 28

what is another name for a disproportionation reaction?

Answer 28

dismutation

Question 29

Potentiometric titration

Answer 29

a form of redox titration where no indicator is used. Electrical potential voltage is measured instead.

Question 30

How many moles of Fe are in iron(III) sulfate?

Answer 30

2

Question 31

Noble gases will always have an oxidation state of ___

Answer 31

0

Question 32

oxidation can also be thought of as ______

Answer 32

number of bonds to oxygen