sodium chloride‚ sodium carbonate‚ magnesium‚copper‚ copper (11) sulfate‚ silver nitrate‚ oxygen‚ lead(11) nitrate‚ sodium carbonate‚ copper (11) sulfate pentahydrate. The dependent variables are the chemical reactions that are being looked for. For example decomposition‚ synthesis‚ single displacement or double displacement of compounds or elements . Hypothesis: Part 1 : I believe that magnesium burning in oxygen will have synthesis reaction because the magnesium will react with the oxygen in the
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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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COMPOUNDS “Analytical chemistry -I” http://foricseandbeyond.blogspot.in/ metal oxide “Oxides of metals are generally stable to heat and they are considered to be most stable form of compound found in nature.” Oxides of potassium‚sodium‚calcium‚magnesium‚ aluminum ‚ zinc‚iron‚lead and copper are stable to heat uO C PbO Zn O http://foricseandbeyond.blogspot.in/ MERCURIC OXIDE “Mercury(II)oxide” “orange red” 2HgO 2Hg + O2 1.The amorphous powder changes to dark red and
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preventing the magnesium from reacting with water at room temperature? Do you think magnesium would react faster in hot water? Explain. The oxide layer of magnesium prevents it from reacting with water at room temperature due to low activation energy. In hot water‚ magnesium reacts faster and vigorously as the kinetic energy of the reactants increases with a rise in temperature. This is because it has greater activation energy which is enough to broken down the insoluble layer of magnesium oxide due to its
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EXPERIMENT 6 – Empirical Formula of a Compound INTRODUCTION Chemical formulas indicate the composition of compounds. A formula that gives only the simplest ratio of the relative number of atoms in a compound is the empirical formula or simplest formula. The ratio usually consists of small whole numbers. We call a formula that gives the actual numbers of each type of atom in a compound the molecular formula. The numbers in a molecular formula will be whole number multiples of the numbers in an empirical
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various metals by observing their reaction with hydrochloric acid. Materials: 2 M hydrochloric acid Detergent Test tubes and test tube rack 0.5 pieces of magnesium‚ aluminium‚ iron‚ zinc and cooper Sand paper Ruler Timer Bench mat Method: 1. The surface of the magnesium was cleaned with a piece of sandpaper 2. The Magnesium was placed into a test tube 3. Three Drops of detergent were added to the test tube 4. 2cm of hydrochloric acid was added to the test tube 5. The timer was set
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O water alone O both air and water O air alone 2 Q: Which gas in the air do you think that iron reacts with as it rusts? O nitrogen O oxygen O argon Rust is a form of iron(III) oxide with water molecules loosely bonded in its structure. (For this reason‚ it is sometimes called hydrated iron(III) oxide). Preventing rust Do you know where there are any painted iron gates or railings? Has the paint done a good job of protecting the iron underneath? Painting is one way of providing a barrier
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Class X Question 1: Chapter 1 – Chemical Reactions and Equations Science Why should a magnesium ribbon be cleaned before burning in air? Answer Magnesium is very reactive metal. When stored it reacts with oxygen to form a layer magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be exposed into air. Question
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1 mL for aqueous solution of the potassium hydroxide‚ hydrochloric acid and the oxides of each sample element was placed in a spot plate and added 2 drops of litmus indicator to each one. Observe the color change. DATA SHEET (Please see attached) TREATMENT OF RESULTS Elements that show metallic properties in the third row of the periodic table of elements are sodium (Na) and aluminum (Al). Those of magnesium (Mg)‚ silicon (Si)‚ phosphorus (P)‚ sulfur (S)‚ chlorine (Cl)‚ and argon (Ar) exhibit
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substances for polarity to check if it’s an ionic or covalent. Conclusion: In Experiment 9‚ I learned that we can use the solubility prosperity
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