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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 ________________________ 2. density ________________________ 3. flammability ________________________ 4. solubility ________________________ 5. reacts with acid to form H2 ________________________ 6. supports combustion ________________________ 7. sour taste ________________________ 8. melting point ________________________ 9. reacts with water to form a gas ________________________ 10. hardness ________________________ 11. boiling point ________________________ 12. can neutralize a base ________________________ 13. luster ________________________ 14. odor ________________________ 15. Graphite is a good lubricant ________________________ 16. Gold does not react with water ________________________ 17. Strontium reacts with water ________________________ 18. Iron rusts when exposed to air ________________________ 19. Diamonds are the hardest natural substance _____________ 20. Silver is a good conductor of electricity ___________________ Physical vs Chemical Changes Classify the following as being a physical or chemical change. 1. Sodium hydroxide dissolves in water. ____________________ 2. Hydrochloric acid reacts with potassium hydroxide to produce a salt, water and heat. ____________________ 3. A pellet of sodium is sliced in two. ____________________ 4. Water is heated and changed to steam. ____________________ 5. Potassium chlorate decomposes to potassium chloride and oxygen gas. ____________________ 6. Iron rusts ____________________ 7. When placed in H2O, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. ____________________ 8. Evaporation ____________________ 9. Ice melting ____________________ 10. Milk sours ____________________ 11. Sugar dissolves in water ____________________ 12. Wood rotting ____________________ 13. Pancakes cooking ____________________ 14. Grass growing ____________________ 15. A tire is inflated with air ____________________ 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 ____________________ ____________________ ____________________ ____________________ ____________________ ____________________ ____________________ ____________________ ____________________ ____________________ Endothermic vs Exothermic Reactions Classify each of the following as endothermic or exothermic 1. A chemical reaction that absorbs energy ____________________ 2. A chemical reaction that releases energy____________________ 3. Oil is burned ____________________ 4. an electric eel shocks its prey ____________________ 5. a cake bakes ____________________ 6. someone strikes a match ____________________ 7. a flashbulb flashes on a camera ____________________ 8. dead plant materials decay ____________________ 9. fireworks explode ____________________ 10. clay turns to brick in a kiln ____________________ 11. chemical reactions occur in a battery ____________________ 12. a firefly flashes its light ____________________ 13. C + O2 → CO + energy ____________________ 14. CaCO3 + energy → CaO + CO2 ____________________ 15. SO2 + H2O → H2SO4 + energy ____________________ 16. CO2 + 43.9kJ → CO + O2 ____________________ 17. H2 + O2 → H2O + 241.8 kJ ____________________ 18. CH4 + 2O2 → CO2 + H2O + energy ____________________ 19. C6H12O6 + O2 → CO2 + H2O + heat ____________________ 20. CO2 + H2O + Light → C6H12O6 + O2 ____________________
