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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Unit 1 – Lesson 1 Chemistry Key Questions 1. Element Standard Notation # Of Electrons # Of Protons # Of Neutrons Sodium 23 11 Na 11 11 12 Chromium 24 Ca 26 26 27 ? Phosphorus 32 P 15 15 16 2. Fireworks; Which metals burn to produce these colours? Red – Lithium (Sr) Blue – Cesium (Cs) Pink – Potassium (K) Yellow/Green – Copper (Cu) Orange – Carbon (Ca) 3. Let’s say that the three bottles contain Fe(NO3)3‚ BaCl‚ and AgNO3. These are Iron (III) Nitrate‚ Barium Chloride
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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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zirconium tetrachlorohydrex gly can cause irritation in sensitive underarm areas. These irritations can cause allergic reactions like contact dermatitis‚ acne‚ or itching. The contact solution I use each morning includes Sodium Borate (Na2[B4O5(OH)4]·8H2O). According to my research‚ Sodium Borate is normally slightly irritating to skin and eyes. When chronic exposure occurs‚ it produce eye irritation‚ cough‚ and skin rash. The hairspray I use each morning includes Aminomethyl Propanol (C4H11NO). At higher
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happens when cations and anions of certain aqueous solutions react and combine forming a precipitate‚ which is an insoluble ionic solid. In this precipitate reaction we dissolved both chosen chemicals (powder Calcium Chloride dihydrate and powder Sodium Carbonate) in distilled water and then mixed them together in a single beaker. Finally we filtered this mixture and let all the water evaporate leaving behind solely the precipitate. In order to determine the amounts needed of each reactant we had
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Answer any FIVE of the following. (each question carries 2 marks) 5x2=10 11. Give two differences between Schottky and Frenkel defects in ionic solids. 12. Name the gases liberated at anode and cathode respectively when an aqueous solution of sodium chloride is electrolysed. 13. Given 2NO(g) + O2 (g) ¾¾ 2NO2(g) ; rate = k[NO]2 [O2]1. By how many times ® does the rate of the reaction change when the volume of the reaction vessel is reduced to 1/3rd of its original volume? Will there be any
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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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one tablet daily (morning) Chlorpromazine 50mg tablets – one tablet 3 times daily (morning‚ midday‚ night) Chlorpromazine 100mg tablets – one tablet 3 times daily (morning‚ midday‚ night) Valproate Semi sodium 500mg tablets – one tablet 3 times daily (morning‚ midday‚ night) Sodium Chloride MR 600mg tablets – 2 tablets 4 times daily (morning‚ midday‚ teatime‚ night) Promethazine HCI 25mg tablets – one tablet daily (night) Procyclidine 5mg tablets – one tablet daily (morning) Lorazepam
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