Most missed exam review

Question 2

What is the molecular formula for Butane?

Answer 2

C4H10

Question 3

What is the formula to find the ane(example butane, ethane, propane)?

Answer 3

CnH2n+2

Question 4

A hypothetical element has two isotopes: 52X and 56X. The average atomic mass of the element is 54.6 amu. Which signal intensity is larger and which is smaller?

Answer 4

the signal intensity for 52X is larger then 56 signal intensity

Question 5

How many m are in a km?

Answer 5

1000m

Question 6

How many milimeters(ml) are in a meter(m)

Answer 6

1000mm

Question 7

How to go from nm to m?

Answer 7

times it by 10^-9

Question 8

What is the units of energy for light?

Answer 8

J/Photon

Question 9

How to go from J/Photon to kJ/mol?

Answer 9

1Kj/1000J x 6.022 x 10^23photons/1mol

Question 10

how many J is in 1 kJ?

Answer 10

1000J

Question 11

How many photons is in one mol?

Answer 11

6.022 x 10^23 photons

Question 12

Bond enthalpies are always____becasue energy must be____to break a chemical bond

Answer 12

endothermic or positive , absorbed

Question 13

A light source hits the surface of platinum metal and no electrons are emitted. What change should be made to the light source to eject electrons?

Answer 13

Decrease the wavelength of the light source

Question 14

Given the following 1.00 M aqueous solutions, identify the least conductive and most conductive solutions:

CH3OH
NaOH
CH3COOH

Answer 14

NaOH strong electrolyte
CH3OH
CH3COOH weak electrolyte

Most conductive:NaOH
Least Conductive:CH3COOH

Question 15

How do you know if there is a radial node?

Answer 15

there will be more than one hump more than one node if there is only one large curve it isn’t a radial node?

Question 16

If there is 0 radial nodes what is the orbital being shown?

Answer 16

1s

Question 17

Which change leads to an increase in potential energy of the system?

Two negative charges are moved closer together.
Two positive charges are moved farther apart.
A negative charge and a positive charge are moved closer together.

Answer 17

Two negative charges are moved closer together.

Question 18

If the ∆H value is positive is it endothermic or exothermic?

Answer 18

endothermic

Question 19

The transition of an electron from the n = 3 state to the n = 4 state requires absorption of a photon.

True or False

Answer 19

True

Question 20

What does ∆H= to ?

Answer 20

qrxn

Question 21

What does qrxn=?

Answer 21

-qsoln

Question 22

If you are trying to find the qrxn how do you go from qsolution to qrxn?

Answer 22

-qsol=qrxn you make it positive

Question 23

How many mg are in g?

Answer 23

1000mg to 1g

Question 24

Constructive combination of two 1s atomic orbitals leads to the bonding MO

Answer 24

false

Question 25

AB3 with 2 lone pairs

Answer 25

polar

Question 26

The lattice energy for KBr is +671 kJ/mol. Which reaction below represents the lattice energy for KBr?

KBr(s) → K(s) + ½ Br2(l)

KBr(s) → K+(g) + Br–(g)

KBr(s) → K+(s) + ½ Br2–(g)

K(s) + ½ Br2(l) → KBr(s)

Answer 26

KBr(s) → K+(g) + Br–(g)

Question 27

Overlap of two p-orbitals oriented perpendicular to the bonding axis

sigma or pi

Answer 27

pi

Question 28

Overlap of one s-orbital with one p-orbital.
sigma or pi

Answer 28

sigma

Question 29

Overlap of one s-orbital with one sp3 hybrid orbital.
sigma or pi

Answer 29

sigma

Question 30

When given two different molecules that have the same temperature but different masses who has the bigger Kinetic Energy?

Answer 30

the one with the lowest mass

Question 31

When given two different molecules with the same mass but different tempatures who has the bigger kinetic energy?

Answer 31

the one with the higher temp