Presentation on theme: "Chemical Formulas and Equations"— Presentation transcript:
1 Chemical Formulas and Equations Section 2Chemical Formulas and Equations
2 Determining Chemical Names Identify each compound as ionic or covalentUse the table 1 on page 297 to write the chemical formulaSulfur trioxideCalcium fluoridePhosphorus pentachlorideDinitrogen trioxideLithium oxide
3 Chemical FormulasA shorthand way to use chemical symbols and numbers to represent substancesFormed from the periodic table
4 Chemical EquationsUses chemical symbols and formulas to describe a chemical reaction
5 The Process Reactants-the starting materials Products-substances formed from reactionYield- the arrow separates the two
6 Balancing Equations Closed systems-nothing comes in or goes out Total mass of the system remains the same
7 Conservation of Matter Antoine LavoisierMass is neither created nor destroyedMass of the reactants equals the mass of the products
8 Making SenseCoefficient-number placed in front of a chemical symbol or formulaOnly the coefficient can be changed not the subscript
9 Keep it BalancedThe number of atoms of the reactants must equal the number of atoms of the productsYou’ve done it!
10 Covalent Compounds Composed of two nonmetals Prefixes used to express number of atoms of each element
11 Ionic Compounds Composed of a metal and a nonmetal The compounds charges must equal 0
12 Be AccurateAccuracy would result in the correct reaction or a big mistakeBalance it out…..