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