Aim: To produce and test for hydrogen gas. Materials: * rubber stopper * dilute hydrochloric acid (HCI) * zinc pieces (Zn) * test-tube rack * matches * dilute sulphuric acid (H2SO4) * 2 cm strips of magnesium ribbon (Mg) * Iron pieces (Fe) * Test-tube Method 1. Test the different metals with the acids by separately combining each piece of metal with 5mL of acid in a test-tube. 2. Cover the opening of the test-tube with the rubber stopper to trap any gas.
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Materials • 6 test tubes and rack • Test tube holder • Bunsen burner • Hydrochloric acid 0.1M • Copper sulphate solution 0.5M • Bunsen burner Method Diagrams of the set up for experiments: 1‚ 2 and 3 Experiment 1 1. Pour about 1cm of hydrochloric acid into each test tube 2. Drop a piece of zinc into each of the first two test tubes. Reduce the concentration of the hydrochloric acid in the second test tube by adding water until
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1. The property of metals by which they can be beaten in to thin sheets is called- a. malleability b. Ductility c. conduction d. Expansion Ans . 1. (a) 2. Which one of the following is metal? a. C b. N c. Na d. O Ans . 2. (c) 3. Which one of the following is non metal? a. Zn b. Al c. Fe d. N Ans . 3. (d) 4. All materials shown property of malleability expect a. Iron b. Graphite c. Aluminium d. Silver Ans . 4. (b) 5. Which one of the following is a good conductor of electricity
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اإلنجليزية‚الشارقة OUR OWN ENGLISH HIGH SCHOOL‚ SHARJAH A GEMS SCHOOL CHEMISTRY WORKSHEET TOPIC: METALS AND NON-METALS GRADE:8 Note: Revise the symbols and valency of metals and non-metals. Q1.What would you observe when you put a) Some zinc pieces into blue copper sulphate solution? b) Some copper pieces into green ferrous sulphate solution? c) An iron nail into blue copper sulphate solution? Q2.Complete and balance the following equations: a) Zn + O2 b) Pb + O2 c) Cu + O2 d) Mg + H2O
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1. Why should magnesium ribbon be cleaned before burning in air ? Ans: Magnesium ribbon is a very reactive metal. When stored it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide being a stable compound prevents further reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly. Q.2. Write the balanced equation for the following chemical reactions:
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-Pine As pine is a cost effective building material‚ which is incredibly versatile and strong‚ it is used a considerable amount in todays product industry. Pine can be finished in a variety of ways including that of waterproofing it‚ so it can be used in moisture rich environments. One way of achieving this is by applying Briwax to the surface of the wood using a small cloth or a ball of wire wool‚ and rubbing it into the grain with a circular motion. -Steel Steel is an alloy of iron and a small
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Determining an enthalpy change of a displacement reaction Aim: To determine the enthalpy change for the displacement reaction between zinc powder and copper (II) sulphate solution. Zn (s) + Cu2+ (aq) → Cu2+ (s) + Zn2+ (aq) Theory: For the displacement reaction‚ an excess amount of zinc powder is added to the measured amount of aqueous copper (II) sulphate. The temperature change over a period of time has to be measured and thus‚ the enthalpy change for the reaction can be measured. The equation
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concentration of negative terminal electrolyte‚ the higher the potential difference in voltaic cell. Variables: Manipulated variable | Concentration of negative terminal electrolyte * Use zinc sulphate solution‚ ZnSO4 as the negative terminal electrolyte throughout the experiment * Use zinc sulphate solution‚ ZnSO4 of different concentration‚ 1.0M‚ 0.10M‚ 0.010M and 0.0010M
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The Reaction of Various Metals with Ionic Salts Purpose: To examine the reaction of various metals with ionic salts Materials: * 4 test tubes * test tube racks * 10mL measuring cylinder * 4 metals (in containers)- Zn‚ Sn‚ Mg‚ Fe * copper (II) sulphate solution Safety: 1. Be careful with copper (II) sulphate solution it is poisonous and corrosive. handle with care 2. Do NOT BREATH in any gases produced 3. If you touch any of the metals‚ you MUST wash your hands
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Introduction : Solanum nigrum Linn. commonly known as Black Nightshade is a dicot weed in the Solanaceae family. Other names of S. nigrum are European Black Nightshade or just black nightshade‚ Duscle‚ Garden Nightshade‚ Hound’s Berry‚ Petty Morel‚ Wonder Berry‚ Small-fruited black nightshade. It is a species of the Solanum genus‚ native to Eurasia and introduced in the Americas‚ Australia‚ Asia and South Africa. The plant is cultivated as a food crop‚ both for its fruit and its leaves in some
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