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Science 90 Chemistry Review Sheet Balance the following equations and identify their reaction type. ___Au2O3 ____ Au + ___ O2 ___H2O2 ____ H2O + ____ O2 ___SiO2 +___ HF ___ SiF4 + ____H2O ___Fe2O3 + ___ C ___ CO + ___Fe ___Fe3O4 + ___ H2 ___ Fe + ___ H2O Draw the Bohr models for the following elements C H Cl Ar Draw the electron dot diagrams for the following elements Na P Ne B 1. Write the word equations for the following reactions. (8) a. Hydrochloric acid reacts with Zinc to produce Zinc Chloride and Hydrogen gas. b. Lead iodide and potassium nitrate are produced by the reaction of Potassium iodide and lead nitrate. c. Sodium chloride is produced from the reaction of sodium and chlorine gas. d. Acetylene burns to produce carbon dioxide and water (careful with this one, there’s a trick) 2. Identify each of the following substances as (5) E = Element C = Compound M = Mechanical Mixture S = Solution a. Salt water d. Gold b. Oxygen gas e. Salt c. Lemonade For each of the following elemental symbols, state the element 1. Fe 6. Helium 2. Mg 7. Copper 3. Au 8. Nickel 4. Be 9. Phosphorus 5. Na 10. Boron Explain the meaning of each letter and number in the following equations. NaCl S2SO4 CO2 List the 5 clues that a chemical change has occurred. How many Protons, Neutrons and electrons are in the following elements? Ag Ca Si U Ne F P P P P P P N N N N N N e e e e e e Identify the following WHMIS symbols Identify the following as either Physical or Chemical changes. If it is Chemical, explain what indicators were present. 1. Sugar dissolves in warm water 7. Dry Ice (solid carbon dioxide -- CO2) is sublimed at room temperature. Physical Change Physical Change Chemical Change Chemical Change 2. A nail rusts. Physical Change Chemical Change 3. A glass breaks. Physical Change 8. Vinegar reacts when mixed with baking soda. Physical Change Chemical Change 9. Water boils at 100 degrees Celsius Chemical Change Physical Change 4. A piece of paper burns. Chemical Change Physical Change 10. Zinc when immersed in Hydrochloric Acid produces hydrogen gas. Chemical Change Physical Change 5. Iron and sulfur mix and form a partially magnetic black and yellow mixture. Physical Change Chemical Change 6. Iron and sulfur are heated and form a nonmagnetic shiny grey substance. Physical Change Chemical Change Chemical Change