PPT-Ch. 22 Chemical Bonds What is a Chemical Formula?

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 . 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 . 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……. Add the new notes to your . table of contents. , and then turn to the next clean page and set up your title and date. Tape the two slides into your INB flat down, directly under your title - they do not need to flip up. 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 . is . concerned that he cannot remember all of the important information about the . different types of. chemical bonds, so he asks his . tutor, Josh, . to help him review the different types of chemical bonds prior to choosing his research topic. . Covalent Bond. bond formed when atoms share electrons.. Examples – . HCl. , H. 2. O, CO. 2. Ionic Bond. bond formed when an atom gains or loses electrons.. Examples – . NaBr. , . NaCl. , . KBr. Do not. . start drawing on the whiteboards. Have . your periodic table out. Any questions from your review guide?. How many valence electrons does sodium have?. How do you know?. How many valence electrons does chlorine have?. CarbonCSulfurSNitrogen NPhosphorus P Arsenic AsChorineClFluorine FOxygen OVisualising and Reading Molecular StructuresSingle bondDouble bondModelsTranslationThisisaformatoftenusedbychemistsItallowsbon Changes or transforms chemicals into . other. chemicals. Ex: Iron + Oxygen . . Iron Oxide (rust). Physical Science Review. What is the product?. What are the reactants?. Chemical formula. . shows the kind and proportion of atoms of each element that occurs in a particular compound. 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 . All. chemical reactions either release or absorb energy. . The energy can take many forms: . HEAT. , . LIGHT. , . SOUND. , and . ELECTRICITY. . Chemical . bonds. are the source of this energy. .