PPT-Chemical Formula

Tells the relative number of atoms of each element in a compound Molecular covalent bonding Formula represents the number of atoms of each element in a single molecule Ionic . Formulas. Chemical Formulas represent compounds.. Oxidation Numbers are used to determine the ratio in which elements combine to form compounds.. Understanding Chemical. Formulas. Chemical formulas are composed of a . Do Now: from last years regents. Chemical Formulas. Tell . type. & . number. atoms in compound. Microscopic level: . Formula gives atom ratios. Macroscopic level: . Formula gives mole ratios. EXAMPLE. Chemical Reactions. chemical reactions. Timely news related to chemistry:. This is just one reason why understanding some chemistry is important to our daily lives.. Ferric chloride (FeCl. 3. ). Nitric Acid (HNO. NOTES. MOLECULE. A . molecule. is . two . or more atoms that have chemically . combined.. Examples. : . H. 2. O. & O. 2. CHEMICAL FORMULA. A . Chemical Formula . is a description of the number and kind of atoms found in a single molecule of a substance, using the . Why Study Chemistry?. . Think about current issues in the news.. . . . . . . 2. Why Study Chemistry?. . Think about current issues in the news.. Energy sources. . . THE MOLE. Mole. -The . number of C atoms in exactly 12.0 g of carbon., also a number 6.022 x 10. 23. Avogadro’s number . 6.022 x 10. 23. , the number of . particles. in a mole of . anything. More on the mole later……. Recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts.. Recognize whether a chemical equation containing coefficients is balanced or not and how that relates to the law of conservation of mass.. Chapter 5: Molecules and Compounds. Learning Goals. Write . chemical formulas.. Determine . the total number of each type of atom in a chemical formula.. Classify . elements as atomic or molecular.. Classify . Stoichiometry. Mass and Moles of a Substance. Chemistry requires a method for determining the numbers of molecules in a given mass of a substance. . which has lead to the development of the . mole. (quantity of substance to be discussed later).. . 1. Describing a Chemical Reaction. A chemical reaction = the process by which one or more substances is changed into one or more different substance. s.. Reactants. = the original . substance(s. I. Percent Composition. Think about this:. How would you find the percent of boys in our class?. # of boys (part)____. x 100% . Total # of students (whole). I. Percent Composition. . RS Software Table of Contents 1 nnSystem Requirements 3Hardware Requirements 3Recommended 3Minimum 3Software Requirements 3Recommended 3Minimum 3Printer Requirements 3Installation 4General Info The key words are emphasized in bold . and there is a list of them at the end of the presentation. . Chemical Reactions. When a chemical reaction occurs, new substances (called . products. ) form from the substances taking part in the reaction (called . Chemistry 1-2. Mr. . Chumbley. Section 1: Describing Chemical Reactions. Chemical Reactions. A . chemical reaction . is a process by which one or more substances change to produce one or more different substances.