Presentation on theme: "Section 2 Chemical Formulas and Equations. Identify each compound as ionic or covalent Use the table 1 on page 297 to write the chemical formula Sulfur."— Presentation transcript:
Section 2 Chemical Formulas and Equations
Identify each compound as ionic or covalent Use the table 1 on page 297 to write the chemical formula Sulfur trioxide Calcium fluoride Phosphorus pentachloride Dinitrogen trioxide Lithium oxide
Chemical Formulas A shorthand way to use chemical symbols and numbers to represent substances Formed from the periodic table
Chemical Equations Uses chemical symbols and formulas to describe a chemical reaction
The Process Reactants-the starting materials Products-substances formed from reaction Yield- the arrow separates the two
Balancing Equations Closed systems-nothing comes in or goes out Total mass of the system remains the same
Conservation of Matter Antoine Lavoisier Mass is neither created nor destroyed Mass of the reactants equals the mass of the products
Making Sense Coefficient-number placed in front of a chemical symbol or formula Only the coefficient can be changed not the subscript
Keep it Balanced The number of atoms of the reactants must equal the number of atoms of the products Youve done it!
Covalent Compounds Composed of two nonmetals Prefixes used to express number of atoms of each element
Ionic Compounds Composed of a metal and a nonmetal The compounds charges must equal 0
Be Accurate Accuracy would result in the correct reaction or a big mistake Balance it out…..