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Classify each of the following processes as a physical change or a chemical change and as an exothermic or endothermic reaction. (a) Sugar is dissolved in water in a test tube and the test tube feels cold. (b) Gasoline is burned in a car engine. (c) Water is converted to steam according to the equation H,0(1) + heat H,0).

Classify each of the following processes as a physical change or a chemical change and as an exothermic or endothermic reaction. (a) Sugar is dissolved in water in a test tube and the test tube feels cold. (b) Gasoline is burned in a car engine. (c) Water is converted to steam according to the equation H,0(1) + heat H,0).

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
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Answer the following pre lab questions. The safety precautions and procedures are in the photos that I sent. 

Pre-Lab Questions 1. Read the entire procedure and the recommended safety precautions. What hazards are associated with the use of hydrochloric acid in the lab? How can these hazards be reduced? 2. Classify each of the following processes as a physical change or a chemical change and as an exothermic or endothermic reaction. (a) Sugar is dissolved in water in a test tube and the test tube feels cold. (b) Gasoline is burned in a car engine. (c) Water is converted to steam according to the equation H,0(1) + heat H,0). 3. Two solutions, hydrochloric acid and sodium hydroxide, were mixed and the temperature of the resulting solution was measured as a function of time. The following graph was recorded. Is the reaction between hydrochloric acid and sodium hydroxide exothermic or endothermic? 30 25 20 15 10 0 20 40 60 80 100 120 Time (sec) Flinn ChemTopic" Labs-Thermochemistry Temperature (°C)
Transcribed Image Text:Pre-Lab Questions 1. Read the entire procedure and the recommended safety precautions. What hazards are associated with the use of hydrochloric acid in the lab? How can these hazards be reduced? 2. Classify each of the following processes as a physical change or a chemical change and as an exothermic or endothermic reaction. (a) Sugar is dissolved in water in a test tube and the test tube feels cold. (b) Gasoline is burned in a car engine. (c) Water is converted to steam according to the equation H,0(1) + heat H,0). 3. Two solutions, hydrochloric acid and sodium hydroxide, were mixed and the temperature of the resulting solution was measured as a function of time. The following graph was recorded. Is the reaction between hydrochloric acid and sodium hydroxide exothermic or endothermic? 30 25 20 15 10 0 20 40 60 80 100 120 Time (sec) Flinn ChemTopic" Labs-Thermochemistry Temperature (°C)
Safety Precautions Hydrochloric acid solution is toxic by ingestion or inhalation and is corrosive to eyes and skin. Avoid contact with eyes and skin. Notify the teacher and clean up all spills immediate- ly with large amounts of water. Ammonium chloride and calcium chloride are slightly toxic by ingestion. Wear chemical splash goggles and chemical-resistant gloves and apron. Wash hands thoroughly with soap and water before leaving the laboratory. Procedure Part A. Observing Heat Changes 1. Obtain 3 weighing dishes or small beakers and label them A-C. 2. Weigh out the appropriate amount of solid into each weighing dish, according to the fol- lowing table. Record the exact mass of each solid in Data Table A. Weighing Dish A C Solid Ammonium chloride Calcium chloride Sodium bicarbonate Mass 2-3 g 3-4 g 1-2 g 3. Open a zipper-lock plastic bag and pour the solid from A into the bottom of the bag. Tilt the bag so all the solid falls into one corner of the bag, then lay the bag flat on the table. 4. Measure 10 mL of distilled water in a graduated cylinder and pour the water into the bag, trying to pool the water in the upper third of the bag. 5. Close the zipper-lock bag and gently squeeze the bag to mix the solid and liquid contents. 6. Feel the side of the bag where the reaction is occurring and record whether the bag feels hot or cold to the touch. Observe what happens as the contents mix. Record all observa- tions in Data Table A. 7. Wash the contents of the bag down the drain with excess water. Rinse the inside of the bag with distilled water and dry it using a paper towel. 8. Repeat steps 3-6 using sample B and 10 mL of distilled water. 9. Wash the contents of the bag down the drain with excess water. Rinse the inside of the bag with distilled water and dry it using a paper towel. Exploring Energy Changes
Transcribed Image Text:Safety Precautions Hydrochloric acid solution is toxic by ingestion or inhalation and is corrosive to eyes and skin. Avoid contact with eyes and skin. Notify the teacher and clean up all spills immediate- ly with large amounts of water. Ammonium chloride and calcium chloride are slightly toxic by ingestion. Wear chemical splash goggles and chemical-resistant gloves and apron. Wash hands thoroughly with soap and water before leaving the laboratory. Procedure Part A. Observing Heat Changes 1. Obtain 3 weighing dishes or small beakers and label them A-C. 2. Weigh out the appropriate amount of solid into each weighing dish, according to the fol- lowing table. Record the exact mass of each solid in Data Table A. Weighing Dish A C Solid Ammonium chloride Calcium chloride Sodium bicarbonate Mass 2-3 g 3-4 g 1-2 g 3. Open a zipper-lock plastic bag and pour the solid from A into the bottom of the bag. Tilt the bag so all the solid falls into one corner of the bag, then lay the bag flat on the table. 4. Measure 10 mL of distilled water in a graduated cylinder and pour the water into the bag, trying to pool the water in the upper third of the bag. 5. Close the zipper-lock bag and gently squeeze the bag to mix the solid and liquid contents. 6. Feel the side of the bag where the reaction is occurring and record whether the bag feels hot or cold to the touch. Observe what happens as the contents mix. Record all observa- tions in Data Table A. 7. Wash the contents of the bag down the drain with excess water. Rinse the inside of the bag with distilled water and dry it using a paper towel. 8. Repeat steps 3-6 using sample B and 10 mL of distilled water. 9. Wash the contents of the bag down the drain with excess water. Rinse the inside of the bag with distilled water and dry it using a paper towel. Exploring Energy Changes
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