Wednesday Sub Assignment

Work with your group – get as much done as possible – this will be collected!!!

#1 IONIC BONDExample: Draw the electron-dot symbols

representing the following reactions: sodium atom + chlorine atom form ions to

produce sodium chloride

#2 COVALENT BONDEx: Use electron dot formulas to represent

the reaction described. hydrogen atom + chlorine atom → HCl

molecule

#3 ELECTRON DOT FORMULAS OF MOLECULESExample: Draw the Electron dot formula for

each of the following molecules: a. H2S b. CH2Br2 c. SO3

d. HCN

#4 ELECTRON DOT FORMULAS OF POLYATOMIC IONS Example: Draw the Electron dot formula for

each of the following polyatomic ions: a. NH4

+1

b. NO3-1

c. PO4-3

d. CO3-2

Watch the following video before moving on (8 min)https://www.youtube.com/watch?v=AFqwtY7

m2PI

#5 Empirical FormulasWrite the empirical formula for the following

compounds. C6H6

C8H18 WO2

C2H6O2 X39Y13

#6 Empirical and Molecular FormulasA compound with an empirical formula of C2OH4

and a molar mass of 88 grams per mole. What is the molecular formula of this compound?

A compound with an empirical formula of C4H4O and a molar mass of 136 grams per mole. What is the molecular formula of this compound?

A compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole. What is the molecular formula of this compound?

#7 Empirical and Molecular FormulasA compound with an empirical formula of C2H8N and a

molar mass of 46 grams per mole. What is the molecular formula of this compound?

A well-known reagent in analytical chemistry, dimethylglyoxime, has the empirical formula C2H4NO. If its molar mass is 116.1 g/mol, what is the molecular formula of the compound?

Nitrogen and oxygen form an extensive series of oxides with the general formula NxOy. One of them is a blue solid that comes apart, reversibly, in the gas phase. It contains 36.84% N. What is the empirical formula of this oxide?

#8 Empirical and Molecular FormulasA sample of indium chloride weighing 0.5000 g is

found to contain 0.2404 g of chlorine. What is the empirical formula of the indium compound?

An unknown compound was found to have a percent composition as follows: 47.0 % potassium, 14.5 % carbon, and 38.5 % oxygen. What is its empirical formula? If the true molar mass of the compound is 166.22 g/mol, what is its molecular formula?

Rubbing alcohol was found to contain 60.0 % carbon, 13.4 % hydrogen, and the remaining mass was due to oxygen. What is the empirical formula of rubbing alcohol?

Sub Stop HereUnless you have a lot of time left – go on and

challenge them to figure this stuff out

#9 SHAPES OF MOLECULES Ex. Give the electron dot formula, shape, and

bond angles for CO2

CH2O

CH4

#10 MOLECULES WHERE CENTRAL ATOM HAS ONE OR MORE LONE PAIRS AB2E: bent ⇒ central atom is bonded to two outer atoms

(B) and has a lone pair of electrons (E) Ex. Give the electron dot formula, shape, and

bond angles for SO2

#11 AB3E: trigonal pyramid ⇒ central atom is bonded to two outer atoms

(B) and has a lone pair of electrons (E) Ex. Give the electron dot formula, shape, and

bond angles for NH3.

#12 AB2E2: bent⇒ central atom is bonded to two outer atoms

(B) and has 2 lone pairs of electrons (E) Ex. Give the electron dot formula, shape, and

bond angles for H2O

#13 REFER TO TABLE OF MOLECULAR SHAPES AND BOND ANGLES TO ANSWER THE FOLLOWING Example For the following molecules or

ions(where the central atom is underlined): i. Draw the Electron dot formula. ii. Determine the shape of the molecule. iii. Determine the approximate bond angles

a. CH2F2

b. OF2

c. phosphite ion, PO3–3

#14 POLAR COVALENT BONDS Example: For each of the bonds below:

i. Use delta notation (δ+ and δ–) to indicate which atom is more electronegative, and

ii. Use an arrow to point from the less electronegative atom to the more electronegative atom C – Cl N – O H – O

#15 Bond TypesExample: Identify the type of bond described for each

of the following: ionic bond:metallic bond: polar covalent:nonpolar covalent:The C–O bonds in CO2

The C–C bonds in C3H8 The bonds in F2

The bonds in BaThe bonds in K2O The bonds in H2O

#16 SHAPES OF MOLECULESA molecule with polar bonds is polar if either

of the following applies: 1) the central atom has one or more lone

pair(s) of electrons, or 2) the atoms bonded to the central atom are

not identical Ex. 1: Determine whether the following

molecules are polar or nonpolar: CO2

H2O SO3