Color:- Most of the metals are grey in color. But gold and copper are exceptions. Chemical Properties of Metals: Part-I Reaction with oxygen:- Most of the metals form respective metal oxides when react with oxygen. Examples: (1) Reaction of potassium with oxygen:- Potassium metal forms potassium oxide when reacts with oxygen. (2) Reaction of sodium with oxygen:- Sodium metal forms sodium
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Experiment 5 Determination of Empirical Formulas of Hydrate and Oxide Compounds Room #216 Locker# 1137 Date of Experiment: May 11‚ 2014 Date of Submission: May 16‚ 2014 Purpose: To determine the identity of an unknown hydrated salt calculating the percent water loss after heating and also to determine the empirical formula of magnesium oxide. Results: Table 1: Determination of the mass of waters of hydration of an unknown hydrated compound. Hydrated Compound code: C-14 Mass
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series is a list of metals arranged in order of their reactivity based on displacement reactions‚ reduction of their oxides by hydrogen or carbon‚ the relative ease of decomposition of their compounds and reactions with oxygen‚ dilute acids and water. The higher up a metal is in the reactivity series‚ the more reactive it is. In the experiment conducted‚ the three metals‚ magnesium‚ zinc and copper each had to undergo displacement reactions and reactions with water‚ oxygen and dilute acids‚ to arrange
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NSS Chemistry Part 3 Metals HKCEE Past Paper Questions – Structural Questions 1. HKCEE 1995 Q1 Rubidium (Rb) and potassium belong to the same group in the Periodic Table. The relative atomic mass of rubidium is larger then that of potassium. (a) Explain whether rubidium is more reactive than potassium. (b) Write a chemical equation for the reaction between rubidium and water. (State symbols should be given.) (c) Suggest how rubidium can be stored safely in the laboratory.
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Observation 8) Conclusion Introduction: Metals and alloys undergo rusting and corrosion. The process by which some metals when exposed to atmospheric condition i.e.‚ moist air‚ carbon dioxide form undesirable compounds on the surface is known as corrosion‚ The compounds formed are usually oxides . Rusting is also a type of corrosion but the term is restricted to iron or products made from it .Iron is easily prone to rusting making its surface rough. Chemically‚ rust is a hydrated ferric oxide. Titanic‘s
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CH3COOH • 0.1 M sodium hydroxide‚ NaOH • 1 M hydrochloric acid‚ HCl • 1 M ethanoic acid (acetic acid)‚ CH3COOH • universal indicator solution • limewater (calcium hydroxide‚ Ca(OH)2) Marble chips (calcium carbonate‚ CaCO3) Copper(II) oxide‚ CuO Small pieces of magnesium‚ Mg Measuring cylinder 10 clean‚ dry test tubes Test tube rack Two spatulas Plastic forceps Dropping pipette 2 × 100 mL conical flask One-holed rubber stopper with bent glass delivery tube Retort stand 2 × Clamp and bosshead Long taper
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normal circumstances‚ room temperature‚ magnesium metal‚ Mg‚ reacts very slowly with the oxygen‚ O‚ in the air. However‚ as magnesium is heated‚ it reacts quicker with the oxygen and burns with a white light to produce MgO. To protect others from the smoke‚ containing Magnesium Oxide‚ the crucible had to remain covered. Some magnesium oxide escaped‚ when the crucible was not covered. The crucible had to be slightly ajar when heating up the magnesium‚ so that oxygen could get to the reaction
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| Na2CO3 | 22 | Sodium chloride formula | NaCl | 23 | Aaluminum hydroxide formula | Al(OH)3 | 24 | Magnesium hydroxide formula | Mg(OH)3 | 25 | Methane formula | CH4 | 26 | Nitrogen monoxide formula | NO | 27 | Potassium hydroxide formula | KOH | 28 | Sodium nitrate formula | NaNO3 | 29 | Sulfurous acid formula | H2SO3 | 30 | Phosphate formula | PO4- | 31 | Aluminum oxide formula | Al2O3 | 32 | Ammonia chemical formula | NH4 | 33 | Ammonium nitrate formula | NH4NO3 | 34
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force and form a strong ionic bond to form sodium chloride (NaCl). Na - (e) = Na(+) Cl + (e) = Cl(-) Na(+) + Cl(-) = NaCl (2) Magnesium Oxide Magnesium Oxide is an ionic compound formed by the reaction between the metal magnesium and non-metal oxygen. During the reaction two electron is transferred from each magnesium atom to each oxygen atom. Magnesium atom with an electron arrangement of 2.8.2 is not stable thus it has to donate two electron to achieve
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What is the total number of atoms in (NH4)2SO4? (1) 10 (2) 11 (3) 14 (4) 15 22. Write the correct formula for the following binary ionic compounds. (a) Lithium fluoride LiF (b) Calcium oxide CaO (c) Aluminum nitride AlN (d) Beryllium chloride BeCl2 (e) Potassium iodide KI (f) Aluminum oxide Al2O3 23. Write the correct formula for the following binary molecular compounds. (a) Carbon monoxide CO (b) Boron tribromide BBr3 (c) Sulfur hexafluoride SF6 (d) Carbon dioxide
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