ES - Oxidation states

Question 1

What does oxidation state tell us?

Answer 1

How many electrons atoms have.

How many electrons it has donated or accepted to form an ion or a bond.

Question 2

What is the oxidation state of all uncombined elements?

Answer 2

0

Question 3

What does it mean if uncombined elements have an oxidation state of 0?

Answer 3

They haven’t accepted or donated any electrons.

Question 4

What will the oxidation state be of elements that are bonded to identical atoms?

Answer 4

0

Question 5

What is the oxidation state of a simple, monatomic ion (an ion consisting of just one atom)?

Answer 5

It is the same as its charge.

Question 6

What does monatomic mean?

Answer 6

Consisting of just one atom.

Question 7

For compound ions (ions made up of more than one atom), what is the overall oxidation state?

Answer 7

The same as the overall charge on the ion.

Question 8

What are compound ions?

Answer 8

Ions consisting of more than one atom.

Question 9

What will the sum of the oxidation state of the individual elements in a compound ion be equal to?

Answer 9

The overall oxidation state.

Question 10

For a neutral compound, what is the overall oxidation state?

Answer 10

0

Question 11

What is the common oxidation state of oxygen?

Answer 11

-2

Question 12

What is the common oxidation state of hydrogen?

Answer 12

+1

Question 13

What are the exceptions of the oxidation state of oxygen being -2?

Answer 13

Peroxides where it’s -1

Fluorides (OF2 where it is +2 and O2F2 where it is +1)

O2 where it is 0

Question 14

What are the exceptions of the oxidation state of hydrogen being +1?

Answer 14

Metal hydrides where it is -1

H2 where it is 0

Question 15

What do roman numerals in a name tell us?

Answer 15

oxidation state

Question 16

Where in a name are the roman numerals found?

Answer 16

Written after the name of the element they correspond to.

Question 17

How do you name an ionic compound?

Answer 17

Just stick the name of the positive ion in front of the name of the negative ion.

Question 18

What does it tell us if the name of an ion ends in -ate?

Answer 18

The ion contains oxygen and another element.

Question 19

How do you name ions using their oxidation states when the non-oxygen element in an ion forms different -ate ions?

Answer 19

Add the oxidation state of the non-oxygen element as a Roman numeral after the name of the -ate compound.

Question 20

What does the name of an ion give you information about?

Answer 20

Its formula.