Putting atoms together

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Presentation transcript:

Putting atoms together Interpreting Formulas Putting atoms together

Molecules Most substances are not made up of individual atoms. Instead, they are made up of molecules. A molecule is a group of atoms that are chemically joined. Ex. oxygen, carbon dioxide, water vapour

Molecular Elements An oxygen atom: O Oxygen molecules: O2 and O3 oxygen gas ozone There are 7 elements that form molecules consisting of two atoms: H2,O2, F2, Br2, I2, N2, Cl2

Compounds (very similar to molecules) A pure substance that contains two or more elements Ex. CO2, N2O3, NaCl

Interpreting Formulas A chemical formula tells you important information about a pure substance: The symbols tell you the elements in the substance If there is only one symbol, the substance is an element If there is more than one symbol, the substance is a compound The subscripts tell you how many atoms of each element are in each molecule of the substance

Ex. Interpret the chemical formula for sodium carbonate (Na2 CO3) How many elements are in the formula? How many atoms of each element are in the formula? What is the total number of atoms in the chemical formula?

Ex. Interpret the chemical formula for sodium carbonate (Na2 CO3) 1. How many elements are in the formula? Sodium, carbon, and oxygen 2. How many atoms of each element are in the formula? Na = 2 C = 1 O = 3 3. What is the total number of atoms in the chemical formula? There are 6 atoms in the formula for Na2CO3 Practice: Interpret the formulas of these compounds: Butane (C4H10) Sulfuric acid (H2SO4)

Classwork pg.251 #1, 2, 3, 5, 7