Unit 4: Chemical Reactions

Question 1

Physical processes?

Answer 1

The changes in intermolecular interactions

Question 2

Chemical processes?

Answer 2

Breaking or forming of a chemical bond.

Question 3

In a strong acid, what is important in solutions?

Answer 3

The concentration of protons is near the concentration of conjugate base.

Question 4

Spectator ions?

Answer 4

Those ions that appear in both sides of th equation in the same way.

Question 5

Net Ionic reaction?

Answer 5

One in which the spectator ions are removed.

Question 6

Electrolytes?

Answer 6

Ions in a solution that conduct current when dissolved.

Question 7

Oxidation number for monatomic ions is always?

Answer 7

Same as the charge.

Question 8

Rules for assigning oxidation numbers (complex?

Answer 8

*each atom in its elemental form is 0.
*monatomic ions has an oxidation number that equals to its charge.
*nonmetals usually have negative oxidation numbers (although sometimes positive)
-oxidation # oxygen usually -2, except O2^-2 (peroxides) which oxidation # -1
-Oxidation # of hydrogen usually +1 when bonded to nonmetals and -1 when bonded metals.
-Oxidation # fluorine is -1 in all compounds. Other halogens have oxidation # -1 in most binary compounds. When combined with oxygen as in oxygen ions, they have positive oxidation states.
*Sum of oxidation numbers of all atoms in neutral compound is 0. In poly atomic ion, = charge of ion.

Question 9

Elemental form?

Answer 9

The most natural state of an atom in nature (e.g., O always exist as O2).

Question 10

Equilibrium point in titration?

Answer 10

When the concentration of acid = base

Question 11

Buffer region?

Answer 11

Solutions that contain weak conjugate acid-base pairs which resist drastic changes in pH when

Question 12

Inert?

Answer 12

Smth that doesn’t react