ap chem

Question 1

exo rxns

Answer 1

feels hot, heat is product, temp up

Question 2

endo rxn

Answer 2

feels cold, heat is reactant, temp goes down

Question 3

delta H of rxn

Answer 3

bonds broken - bonds formed (reactants - products)

Question 4

Breaking bonds is

Answer 4

endo

Question 5

Forming bonds is

Answer 5

exo

Question 6

If a rxn is exo, then bonds formed in the ___ are stronger than the ____ bonds

Answer 6

products, reactants

Question 7

If a rxn is endo, then bonds formed in the ___ are stronger than the ____ bonds

Answer 7

reactants, products

Question 8

Increase in moles of gas is

Answer 8

+ dS

Question 9

What is Keq when dG is (-)

Answer 9

Keq>1

Question 10

negative dG is ____ favored

Answer 10

product favored, forward rxn

Question 11

What are rxns not proceeding at a normal rate called?

Answer 11

Under kinetic control due to high activation energy

Question 12

What is the effect of catalysts and inert gases on equilibrium

Answer 12

No effect

Question 13

Higher energy level means

Answer 13

Farther away from nucleus, less Columbic attraction, lower 1st ionization energy

Question 14

Moving right across a row means

Answer 14

Increased Zeff, higher nuclear attraction of valence e-, atomic radius decreases, ionization increases

Question 15

Peak corresponds to

Answer 15

Number of e- in subshell

Question 16

Isotopes have

Answer 16

same number of protons but dif number of neutrons

Question 17

Mass spectroscopy measures

Answer 17

atomic masses of isotopes

Question 18

Elements in the same group

Answer 18

Same vertical column have similar chemical and physical properties

Question 19

Which is smaller cations or anions and why?

Answer 19

Cations because valence e- is removed and anions have extra valence e- added which increases repulsions

Question 20

Metals are on the ___ side of the zig zag

Answer 20

left

Question 21

Nonmetals are on the ___ side of the zigzag

Answer 21

Right

Question 22

Covalent metals are formed when

Answer 22

two nonmetals share electrons

Question 23

Carbon makes ___ bonds

Answer 23

4

Question 24

What are the diatomic elements

Answer 24

H2 N2 O2 F2 Cl2 Br2 I2 (horses need oats for clear brown eyes)

Question 25

Are asymmetrical molecules polar or nonpolar?

Answer 25

Polar because dipoles don’t cancel

Question 26

Is lattice energy exo or endo

Answer 26

Endo

Question 27

What two factors affect lattice energy?

Answer 27

Increases as charge increases, decreases as radius increases

Question 28

Formal charge formula

Answer 28

valence electrons - [lone electrons + (1/2)(bonded electrons)]