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Chemical Reactions Introduction Physical vs Chemical Property Classify the following properties as either chemical or physical by putting a check in the appropriate column. 1. blue color Physical 2. density Physical 3. flammability Chemical 4. solubility Physical 5. reacts with acid to form H2 Chemical 6. supports combustion Chemical 7. sour taste Physical 8. melting point Physical 9. reacts with water to form a gas Chemical 10. hardness Physical 11. boiling point Physical 12. can neutralize a base Chemical 13. luster Physical 14. odor Physical 15. Graphite is a good lubricant Physical 16. Gold does not react with water Chemical 17. Strontium reacts with water Chemical 18. Iron rusts when exposed to air Chemical 19. Diamonds are the hardest natural substance Physical 20. Silver is a good conductor of electricity Physical Physical vs Chemical Changes Classify the following as being a physical or chemical change. 1. Sodium hydroxide dissolves in water. Physical 2. Hydrochloric acid reacts with potassium hydroxide to produce a salt, water and heat. Chemical 3. A pellet of sodium is sliced in two. Physical 4. Water is heated and changed to steam. Physical 5. Potassium chlorate decomposes to potassium chloride and oxygen gas. Chemical 6. Iron rusts Chemical 7. When placed in H2O, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. Chemical 8. Evaporation Physical 9. Ice melting Physical 10. Milk sours Chemical 11. Sugar dissolves in water Physical 12. Wood rotting Chemical 13. Pancakes cooking Chemical 14. Grass growing Chemical 15. A tire is inflated with air Physical Chemical Reactions Introduction Evidence of a Chemical Reaction All of the following are chemical changes. Identify which piece of evidence indicates that the chemical change has occurred. 16. Baking a cake 17. A flashbulb flashes 18. Cooking waffles 19. A red mark appears after a bee sting 20. Fire works exploding 21. Chunks form in soured milk 22. Vinegar mixed with baking soda foams. 23. Plants undergo photosynthesis 24. Iron rusting 25. Leaves change from green to red Temperature change/Precipitate Temperature change Temperature change/Precipitate Color change Temperature change Precipitate Gas Formation Temperature/Precipitate/Gas Precipitate Color change Endothermic vs Exothermic Reactions Classify each of the following as endothermic or exothermic 1. A chemical reaction that absorbs energy endothermic 2. A chemical reaction that releases energyexothermic 3. Oil is burned exothermic 4. an electric eel shocks its prey exothermic 5. a cake bakes endothermic 6. someone strikes a match exothermic 7. a flashbulb flashes on a camera exothermic 8. dead plant materials decay exothermic 9. fireworks explode exothermic 10. clay turns to brick in a kiln endothermic 11. chemical reactions occur in a battery exothermic 12. a firefly flashes its light exothermic 13. C + O2 → CO + energy exothermic 14. CaCO3 + energy → CaO + CO2 endothermic 15. SO2 + H2O → H2SO4 + energy exothermic 16. CO2 + 43.9kJ → CO + O2 endothermic 17. H2 + O2 → H2O + 241.8 kJ exothermic 18. CH4 + 2O2 → CO2 + H2O + energy exothermic 19. C6H12O6 + O2 → CO2 + H2O + heat exothermic 20. CO2 + H2O + Light → C6H12O6 + O2 endothermic
