Facts You Can’t Live Without

Facts You Can’t Live Without All elements are represented by a capital letter, or a capital letter followed by a lower case letter. If you have 2 capital letters in a row, there are 2 different elements. Ex: NI N, I nitrogen, iodine Ni nickel CO C, O carbon, oxygen Co cobalt

Facts You Can’t Live Without Atoms: building blocks of matter, contain complete properties of element, neutral Molecules: 2 or more atoms joined together Ions: charged atoms Cation: positively charged ions Anion: negatively charged ions

Molecular Formulas Molecular Formula Atom 1 Atom 2 Atom 3 Atom 4 Type # H2O H 2 O 1 ----- NaNO3 Na N 3 Mg(OH)2 Mg PCl3 P Cl NaHSO4 S 4 Mg3(PO4)2 8

Learning Check Molecular Formula Atom 1 Atom 2 Atom 3 Atom 4 Type # H2O H 2 O 1 ----- NaNO3 Na N ? 3 Mg(OH)2 Mg PCl3 P Cl NaHSO4 S 4 Mg3(PO4)2 8

Learning Check How many atoms total, and of each type, are in the following: C4H12 PbSO3 Al2(SO4)3 NI3

There are 2 molecules of NH3 formed There are 2 molecules of NH3 formed. Each NH3 molecule contains 1 N atom and 3 H atoms. There are 2 total N atoms and 6 total H atoms on the products side of the equation. This is a single molecule of N2, which contains 2 N atoms. There are 2 total N atoms on the reactants side of the equation. There are three molecules of H2. Each H2 molecule contains 2 H atoms, so there are 6 H atoms total on the reactants side of the equation. There are 2 molecules of NH3 formed. Each NH3 molecule contains 1 N atom and 3 H atoms. There are 2 total N atoms and 6 total H atoms on the products side of the equation. There are three molecules of H2. Each H2 molecule contains 2 H atoms, so there are 6 H atoms total on the reactants side of the equation.