30 3. Lab 1: Physical and Chemical Changes Name Lab Partner's Name Purpose: Interpretation of Results:...

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30 3. Lab 1: Physical and Chemical Changes Name Lab Partner's Name Purpose: Interpretation of Results: Identify by number which experiments resulted in physical change and which experiments resulted in chemical changes. Post Laboratory Questions: Date Experiments that were chemical changes Experiments that were physical changes (write the number corresponding to (write the number corresponding to the experiment) the experiment) Identify the following as physical or chemical changes. 1. Dark colored crystals of iodine are heated and a lavender gas forms. When cooled, the gas forms dark colored crystals. When vinegar is added to milk, lumps form. When a purple solution of "red" cabbage juice is added to colorless soapy water, the color becomes blue. When a piece of sodium is placed in water, the temperature increases and the solution fizzes. When a bottle of pop is opened, vigorous fizzing occurs. 7 Classify the following as physical or chemical properties. Ammonia has a strong odor. 1. 2. 3. A 5. General Questions. 2. 3. The density of lead is 11.4 g/cm³. Limestone fizzes when contacted with acid. A solution on cobalt (II) chloride is a pink while a solution of nickel chloride is green. When rubbing alcohol is placed on your skin, it evaporates and your skin gets colder. The reaction of barium hydroxide octahydrate crystals with dry ammonium chloride forms a cold liquid. Is this an endothermic or an exothermic process? Ammonium nitrate dissolves in water endothermically. Does the water get colder or warmer when the ammonium nitrate is added? Chemical hand warmers consist of finely divided iron filings sealed in a pouch. When the seal is broken the iron reacts with air forming rust and generating heat. Is this an endothermic or an exothermic process? Calcium chloride mixes with water exothermically. Does the temperature increase or decrease? 5. 6. 7. CD 8 10. A blue copper sulfate solution is mixed with a colorless sodium sulfate solution. The resulting solution is a lighter blue color. Did a chemical or a physical process occur? When two clear colorless solutions are mixed, a slight cloudiness results but no precipitate settles out. Did a chemical or a physical process occur? A student mixed two pale blue solutions and observed no change. He then heated the mixture and observed bubbling followed by a darkening in the color of the mixture. No evaporation occurred. Did a chemical or a physical process occur? A shiny metallic solid is placed in a clear colorless solution. The metal becomes darker and no other changes are observed. Did a chemical or a physical process occur? Can a solution be colored and transparent at the same time? When vinegar is mixed with potassium hydroxide solution, the mixture initially becomes quite warm but cools to room temperature over time. Does the mixing of vinegar and potassium hydroxide represent a physical or chemical change? 30 3. Lab 1: Physical and Chemical Changes Name Lab Partner's Name Purpose: Interpretation of Results: Identify by number which experiments resulted in physical change and which experiments resulted in chemical changes. Post Laboratory Questions: Date Experiments that were chemical changes Experiments that were physical changes (write the number corresponding to (write the number corresponding to the experiment) the experiment) Identify the following as physical or chemical changes. 1. Dark colored crystals of iodine are heated and a lavender gas forms. When cooled, the gas forms dark colored crystals. When vinegar is added to milk, lumps form. When a purple solution of "red" cabbage juice is added to colorless soapy water, the color becomes blue. When a piece of sodium is placed in water, the temperature increases and the solution fizzes. When a bottle of pop is opened, vigorous fizzing occurs. 7 Classify the following as physical or chemical properties. Ammonia has a strong odor. 1. 2. 3. A 5. General Questions. 2. 3. The density of lead is 11.4 g/cm³. Limestone fizzes when contacted with acid. A solution on cobalt (II) chloride is a pink while a solution of nickel chloride is green. When rubbing alcohol is placed on your skin, it evaporates and your skin gets colder. The reaction of barium hydroxide octahydrate crystals with dry ammonium chloride forms a cold liquid. Is this an endothermic or an exothermic process? Ammonium nitrate dissolves in water endothermically. Does the water get colder or warmer when the ammonium nitrate is added? Chemical hand warmers consist of finely divided iron filings sealed in a pouch. When the seal is broken the iron reacts with air forming rust and generating heat. Is this an endothermic or an exothermic process? Calcium chloride mixes with water exothermically. Does the temperature increase or decrease? 5. 6. 7. CD 8 10. A blue copper sulfate solution is mixed with a colorless sodium sulfate solution. The resulting solution is a lighter blue color. Did a chemical or a physical process occur? When two clear colorless solutions are mixed, a slight cloudiness results but no precipitate settles out. Did a chemical or a physical process occur? A student mixed two pale blue solutions and observed no change. He then heated the mixture and observed bubbling followed by a darkening in the color of the mixture. No evaporation occurred. Did a chemical or a physical process occur? A shiny metallic solid is placed in a clear colorless solution. The metal becomes darker and no other changes are observed. Did a chemical or a physical process occur? Can a solution be colored and transparent at the same time? When vinegar is mixed with potassium hydroxide solution, the mixture initially becomes quite warm but cools to room temperature over time. Does the mixing of vinegar and potassium hydroxide represent a physical or chemical change?

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1 PHYSICAL CHANGE The change happening here is Sublimation Its an exothermic process where there is ... View the full answer