last min prayers up for haset

solve molecular with empirical

add the masses of the elements in the empirical formula, than divide by provided mass. multiply all numbers in empirical by this to get new molecular formula 

• solve empirical (A compound contains 88.82% copper and 11.18% oxygen by mass. What is its empirical formula?

• divide percentages by atomic mass of each element, THAN DIVIDE VALUES BY LOWEST VALUE. that’s the number ratio for empirical

• ex: 88.82/64 , 11.18/16 

1.38                              0.69 

solve for formal charges :

for each element, valence electrons - (dots + lines) = charges 

percent by mass of element in a compound

• add atomic masses of elements in compound, divide element you’re looking for by the total and multiply by 100

difference of electronegativity between elements :

subtract each elements electronegativity from each others to get range for bond type 

Which of the following species is a radical?
A. HF
B. H2 O
C. NO
D. CCl 4
E. SO2

NO

How many total valence electrons are in the ammonium ion?

8

According to valence bond theory, how many bonds would you expect an oxygen atom to

form based on its bonding capacity?

2

Which of these substances has an incomplete octet in its Lewis structure?

BF₃

Which statement describes the correctly drawn Lewis structure of C2 H4 ?

There’s a double bond

CN⁻ needs a _ to satisfy octets and use all 10 electrons

triple bond

According to valence bond theory, a covalent bond is formed by. . .

overlapping orbitals of two atoms, with one electron in each orbital