Gen Chem 1

Electron Configuration of Ions & Valence Electrons

Determine whether each of the following atoms will gain or lose electrons to follow the octet rule. Write the abbreviated (noble gas) configuration of the atom, identify how many valence electrons the atom has, identify if the atom will gain or lose electrons and how many. Write the ion symbol. Write the electron figuration of the ion. The first one is done for you.

Nitrogen, [He] 2s2 2p3, 5 valence electrons, gain 3, N3-, [He] 2s2 2p6

Potassium

Sulfur

Oxygen

Sodium

Chlorine

Barium

Zinc

Ionic or Covalent Determination Practice

Identify if each element is a metal (M) or a nonmetal (NM) then predict what type of bond they will make in the chemical provided. Bond types include: Nonpolar Covalent, Polar Covalent, and Ionic.

PO43-

MgBr2

K2O

N2

CO2

HF

Fe2O3

CCl4

Naming Practice

Name the following chemicals.

(NH2)2Cr2O7

AgNO3

BaCrO4

Ca3(PO4)2

Ca3P2

CCl4

CdO

Cu(C2H3O2)2

CuO

FeCl3

FeS

Li2S

MgF2

N2H4

N2O5

NaClO2

NaOH

NO

P2O5

SF6

Make the chemical formula from the name

Aluminum Hydroxide

Ammonium Carbonate

Carbon Monoxide

Dinitrogen Pentoxide

Magnesium Fluoride

Postassium Sulfate

Sodium Carbonate

Zinc Oxide

Formula Mass and Percent Composition

Calculate the formula mass of the following compounds and the percent composition of each element in the formula:

N2S2

NaOH

H2O

How many grams of oxygen is there in 1 mole of Sodium Carbonate?

Empirical & Molecular Formula from Data

1. A compound derived from the amino acid cysteine was found to have 29.74% C, 5.82% H, 26.41% O, 11.56% N, and 26.47% S. What is its molecular formula if its molar mass is approximately 242 g/mole?

2. An unknown organic compound (0.315 g) containing only C, H, and O produces 0.771 of CO2 and 0.105 g of H2O when it undergoes complete combustion. What is the empirical formula of the original compound?