1 / 10

Chemical Formulas Chemical Equations

Chemical Formulas Chemical Equations. Chemical Formulas. Chemical Formulas are used as a short hand way of describing the atoms that make up a molecule or compound Chemical Formulas show two things: Types of atoms (element symbol) Number of each type of atom in a compound (subscript). CCl 4

domani
Download Presentation

Chemical Formulas Chemical Equations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chemical FormulasChemical Equations

  2. Chemical Formulas • Chemical Formulas are used as a short hand way of describing the atoms that make up a molecule or compound • Chemical Formulas show two things: • Types of atoms (element symbol) • Number of each type of atom in a compound (subscript)

  3. CCl4 NaBr Al2O3 Mg(OH)2 Ca(NO3)2 Ca3(PO4)2 Determine the number of each type of atom in the following compounds…

  4. Chemical Equations • Chemical Equations are used to show what is present before and after a chemical reaction • Remember, a chemical reaction is any process where a chemical change occurs (and a new substance is produced) • How do you know if a chemical change has occurred?

  5. Chemical Equations • Reactants → Products • The substances that undergo the change are referred to as reactants • The substances formed during the reaction are called products

  6. Conservation of Mass • During chemical reactions, the mass of the products must ALWAYS equal the mass of the reactants • Mass is never created or destroyed during a chemical reaction – it only changes forms • This is referred to as Conservation of Mass

  7. Balancing Equations • Because mass is conserved, the number of each kind of atom must be the same in the reactants and the products • When the number of each type of element is the same in the reactants and the products, the equation is said to be balanced

  8. Balancing Equations • A chemical equation must be balanced by adding coefficients in front of formulas and not by changing the subscripts in the formulas

  9. Balancing Equations Practice • N2H4 + O2→ N2 + H2O • N2H4 + O2→ N2 + 2 H2O • Mg + HCl → H2 + MgCl2 • Mg + 2 HCl → H2 + MgCl2 • Cu + O2→ CuO • 2 Cu + O2→ 2 CuO • C2H4 + O2 → CO2 + H2O • C2H4 + 3 O2 → 2 CO2 + 2 H2O

More Related