* 2 g Potassium Iodide per parts A‚ B‚ C * 2 g Sodium Chloride per parts A‚ B‚ C * 2 g Sucrose per parts A‚ B‚ C * 6 Bunsen Burners * 6 Test Tubes with 25 ml Ethanol each * 6 Test Tubes with 25 ml Water each * 6 100 ml beakers with 50 ml Water each * 10 g Calcium Chloride per parts D * 10 g Citric Acid per parts D * 10 g Phenyl Salicylate per parts D * 10 g Potassium Iodide per parts D * 10 g Sodium Chloride per parts D * 10 g Sucrose per parts D
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associated with even small amounts of each of the following: a. concentrated hydrochloric acid‚ HCl HCL may be corrosive. It can cause burns to dosy tissue and can be deadly if inhaled or swallowed. b. sodium hydroxide‚ NaOH‚ solution NaOH is a very corrosive chemical and contact with it can cause burns to body tissue and possible eye damage. Can irriate the lungs and can cause permanent lung damage. also contact with water can generate enought heat
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Variable: * The diffusion rate of sodium hydroxide (cm/min) Controlled: * The concentration of sodium hydroxide (0.4%)‚ same Na OH used throughout. * Temperature (°C)‚ experiment takes place in the same classroom * Time immersed in Na OH (8 min)‚ using the timer * Number of agar cubes in each beaker‚ excess of Na OH will be used * Concentration of agar cubes (%)‚ same agar cubes used throughout the experiment Uncontrollable: * Volume of sodium hydroxide in each beaker (cm3)
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Calculate the [Fe3+] in a 0.25 M solution of Fe2(SO4)3? 9. Calculate the [Na+] in a 0.55 M solution of sodium acetate. (Write the proper formula for sodium acetate first). 10. Calculate the [Na+] in a 0.55 M solution of sodium carbonate. (Write the proper formula for sodium carbonate first.) 11. Calculate the [Na+] in a 0.55 M solution of sodium phosphate. (Write the proper formula for sodium carbonate first.) 12. 300 mL of 0.500 M NaCl is mixed with 400 mL of 0.200 M HCl. Calculate the final
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Road salt‚ also called rock salt‚ is sodium chloride‚ chemically combined with NaCl. Na is the chemical abbreviation for sodium and Cl is the abbreviation for chloride. Table salt that we use is exactly the same chemical. The US Environmental Protection Agency has set limits on allowable levels of chloride in water but not sodium. In high concentrations both sodium and chloride can be harmful to aquatic organisms. Sodium is the primary concern for humans‚ as it can be harmful to people with high
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T200 Date Class Name Date Class Name CHAPTER Section 15.1 continued 10. As sodium chloride dissolves in water‚ what happens to the sodium and chloride ions? 15 The sodium and chloride ions are separated and surrounded by the water molecules. 11. Explain the orientation of the water molecules around the sodium ions and chloride ions. STUDY GUIDE FOR CONTENT MASTERY CHAPTER 15 STUDY GUIDE FOR CONTENT MASTERY Solutions Section 15.1 What are solutions? In your textbook
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Report Introduction Mummification is an ancient Egyptian method which is a natural or deliberate process intended to dehydrate the body to preserve it. They done this because they believed that if a body was left to rot then it would destroy their soul‚ so they believed that the body needed to be intact to serve as host for the soul. So they preserved bodies so they could use them in the afterlife‚ where the Egyptians believed they would make a journey to another life. To start to mummify a body
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HKDSE Chemistry – A Modern View 1 (SAMPLE) Suggested Answers (Coursebook) |Chapter 1 The fundamentals of chemistry | |Class Practice |1 | |Chapter Exercises |3 | |Chapter 2 The atmosphere
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6 did not. Not many fruits and vegetables contain preservatives simply because they come from nature. One of the items contained Sodium Benzoate‚ a small percentage of people are extremely sensitive to sodium benzoate and can experience asthmatic attacks and other allergic reactions when they take in the preservative. A more normal problem is the combination of sodium benzoate and citric acid and ascorbic acid. When these ingredients mix‚ they form benzene‚ a cancer-causing chemical linked with leukemia
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molar mass is 62.1 g/mole. What is its molecular formula? 5. Name the following: a) Ca(OH)2 b) KCN c) HClO4(aq) d) FeSO4 e) Na2O f) SF6 g) MgSO4 ( 2H2O h) Na2O2 6. What are the formulas of the following compounds? a) sodium sulfite b) potassium permanganate c) calcium sulfide d) aluminum hydroxide e) mercury (II) phosphate f) tetraphosphorus trisulfide g) nitrous acid 7. Which of the following is not an example of a chemical change? a) converting gasoline
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