PPT-Counting Atoms in a Chemical Formula

How many atoms The symbol for an atom is either one capital letter or a capital letter followed by a lower case letter For example F is the symbol for Fluorine Br is the symbol for Bromine. 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. Chapter 2 BLB 12. th. Expectations. Recognize important steps in the discovery of the atom and its structure.. Work with isotopes.. Learn about the periodic table.. Differentiate between molecular and ionic compounds.. 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 . What happens in a Chemical Reaction?. Chemical . bonds. in the reactants are . broken. , then atoms are . rearranged. to form new substances (. products. ). . The amount of . matter. does not . change. Isotopes of Carbon. . . C-12 has 6 protons and 6 neutrons with an abundance of 98.90%. C-13 has 6 protons and 7 neutrons with an abundance of only 1.10%. The Mole. . . The number of units (atoms) in this amount of carbon-12 is our “bunch”. This bunch is called a . Presented by Kesler Science. How are chemical formulas used to identify substances?. How do chemical formulas determine the number of atoms of each element using subscripts, coefficients, and parenthesis?. Why Study Chemistry?. . Think about current issues in the news.. . . . . . . 2. Why Study Chemistry?. . Think about current issues in the news.. Energy sources. . . Atoms are composed of protons, neutrons and electrons. These subatomic particles are charged….. Atoms make elements… Elements can’t be broken down into anything simpler. . Examples:. Carbon= C. Moles and Mass. The . molar mass . gives us the relationship between the . number of moles . and the . mass of an element or compound. .. We can . use the molar mass . to . calculate . the . mass. or . 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 . For Example: If you have a piece of gold and cut it into smaller and . smaller pieces, . you would eventually reach a point where you couldn’t cut the gold up any smaller. That smallest piece would be an atom of gold.. When elements combine to form compounds a chemical reaction occurs creating a new compound with properties that are different from the original elements.. When a new compound is formed it has a new chemical formula. A . They can be joined together by . chemical bonds. From last lesson:. Atoms can have different numbers of protons, neutrons and electrons.. There are 118 different types of atoms.. They can be found on the periodic table of elements.. Chemical Quantities and reactions. . . Course lecturer : . Dr. Altijana Hromić-Jahjefendić. 1 mole of an element = . 6.02 x. . 10. 23. . atoms of that element. Moles of Elements in a Chemical Formula.