Question

Use VSEPR theory to predict the shape of CH4. (1 point)
linear
bent
trigonal planar
tetrahedral

Answer 1

@DanJS

Answer 2

i just know CH4 is tetrahedral, but hmm

Answer 3

Is this where you draw the lewis dot structures

Answer 4

no

Answer 5

The number of electron pairs in the valence shell of a central atom is determined after drawing the Lewis structure of the molecule, and expanding it to show all electron-pair bonds and lone pairs of electron

Answer 6

I remember doing that, but it has been a few years

Answer 7

different configurations for Ions and molecules..

Answer 8

thnx are you n college or sum?

Answer 9

was a couple years ago

Answer 10

chem was first year , for engineering , just 2 general chem classes

Answer 11

I remember doing that, but i honestly cant remember,,

Answer 12

Draw C, with single bonds to the 4 H's and add in the electrons to form the octet i think

Answer 13

non polar,

Answer 14

tetrahedral

Answer 15

do you know how to calculate moles?

Answer 16

yeah what is the given information

Answer 17

im not really sure if its a mole or not but here

The equation H3PO+3KOH--->K3PO3+3H20 is an example of which type of reaction? (1 point)
double-replacement reaction
combination reaction
decomposition reaction
single-replacement reaction

Answer 18

The methane molecule (CH4) is tetrahedral because there are four pairs of electrons. The four hydrogen atoms are positioned at the vertices of a tetrahedron, and the bond angle is cos−1(−1⁄3) ≈ 109°28'

Answer 19

@DanJS

Answer 20

double displacement i think
AB + CD ---> AD + CB

Answer 21

decomposition woule be like

H2o ---> H2 + O2

Answer 22

single displacement is like

KCL + FL ---->KFL + CL

Answer 23

combination is what it sounds like,,, the reverse of that decomp water reaction

Answer 24

THANK YOU!

Answer 25

@DanJS
Cd(NO3)2 + NH4Cl →
did i do this right?
Cd(NO3)2 + 2 NH4Cl ----> CdCl2 + 2 NH4NO3

Answer 26

no prob, i remember how to do the stoichiometry probs pretty well

Answer 27

umm

Answer 28

Nitrate has oxidation stat -1 so
Cadmium must be +2
NH4 is +1
Cl is -1

Answer 29

so the products look good, for the coefficients, umm

Answer 30

looks good to me

Answer 31

balanced the equation? right

Answer 32

yeah , looks good

Answer 33

just count each type of element on each side

Answer 34

for groups like nitrate or ammonia you can just count the groups to be quicker

(NH4) or (NO3)

Answer 35

can you do one more orr?

Answer 36

sure

Answer 37

Describe the shapes and relative energies of the s, p, d, and f atomic orbitals.

Answer 38

@DanJS

Answer 39

hmm,i remember what they look like, one sec.

Answer 40

Does this chart look familiar
http://en.wikipedia.org/wiki/Atomic_orbital#mediaviewer/File:Electron_orbitals.svg

Answer 41

kinda

Answer 42

i am just reading the page http://en.wikipedia.org/wiki/Atomic_orbital#Orbital_energy

Answer 43

remember hte balloon shapes of the S, P, d, f orbitals

Answer 44

Probabilities of where the electron will be located

Answer 45

That is all quantum mechanics dealing with wave functions

Answer 46

collapsing wave function

Answer 47

I think for just general chem, you just have to know the energy Trend as you change orbital shells

Answer 48

like energy increases/decreases

Answer 49

i can do stoichiometry if you have em for sure!

Answer 50

so how would you describe it?

Answer 51

The S shells are spheres

Answer 52

The P shells are like mirrored balloons, there are 3 axis of them ranged perpendicular to each other