Surname Centre No. Initial(s) Paper Reference 4 3 3 5 Candidate No. 2 H Signature Paper Reference(s) 4335/2H Examiner’s use only London Examinations IGCSE Team Leader’s use only Chemistry Paper 2H Higher Tier Wednesday 17 June 2009 – Morning Time: 2 hours Materials required for examination Nil Items included with question papers Nil Question Leave Number Blank 1 2 3 4 5 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number‚ candidate number‚ your surname
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of greenhouse gases. Greenhouse gases Carbon dioxide‚ nitrous oxide‚ methane‚ and chlorofluorocarbons gases that absorb and hold heat from the sun‚ preventing it from escaping back into space‚ much like a greenhouse absorbs and holds the sun’s heat. Ozone depletion The gradual breakdown of ozone gas in the stratosphere above us caused by the release of chlorofluorocarbons (CFCs) into the air. Acid rain Occurs when sulfur oxides and
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SPM CHEMISTRY REVISION MODULE FOR THE MASTERY OF THE BASICS IN SPM CHEMISTRY Panel : 1. 2. 3. 4. June Ling S J Chen Soo Chien Felix Ngui Jong Kah Yin SMK St Joseph‚ Kuching Kolej DPAH Abdilah‚ Kuching SMK Tabuan Jaya‚ Kuching SM Sains Kuching REVISION MODULE FOR THE MASTERY OF THE BASICS IN SPM CHEMISTRY Page Compiled and edited by : Jong Kah Yin 1 SPM CHEMISTRY INDEX CONTENT 1 REVISION CHECK-LIST Form 4 Form 5 2 WRITING EQUATIONS 2.1 Charges of ions 2.2 Formulae of compounds
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In 90 days you are guaranteed to increase energy‚ lose fat‚ tighten up muscles‚ be happier‚ and start to receive comments on your body and energy or you can get your money back. That’s what Dr. Jade Teta promises with his Metabolic Prime program. In fact‚ he promises that you will receive compliments once a day after you hit your 35-day mark because of the noticeable improvements. And all of that will happen by working out just 45 minutes per week. But‚ is this actually worth buying? Will you really
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1) What is the purpose of ice or cold water? To cool down the gas so that it condenses and turns into a liquid. 2) when the gas collecting tube is upside down‚ give a property of this gas. It is less dense than air. 3) Why is a pencil used in drawing the origin line in chromatography? If pen was used‚ it will dissolve giving colours and so‚ the experiment won’t be accurate. Pencil doesn’t interfere with the results. 4) When using ethanol‚ give a better apparatus arrangement‚ and why? Cover
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policy. ©2011 Edexcel Limited. Printer’s Log. No. Turn over N36637A W850/U7081/57570 5/5/5/ *N36637A0120* Leave blank Answer ALL the questions. 1. Complete the table. Name of compound calcium bromide NH4NO3 sodium sulphite copper(I) oxide PbO2 iron(III) sulphate Q1 (Total 6 marks) Formula of compound 2 *N36637A0220* Leave blank 2. Complete the following statements by inserting the missing colours. (a) When water is added to anhydrous cobalt chloride‚ it turns ......
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condition of pollution in certain urban environments. It is produced largely by the action of sunlight on car exhaust gases. Two groups of compounds emitted from car exhausts‚ that contribute to the formation of smog‚ are nitrogen oxides and unburned hydrocarbons. Nitric
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H2O (ℓ) is balanced? 1‚ 4‚ 2‚ 4 1‚ 2‚ 1‚ 2 1‚ 1‚ 1‚ 2 None of the above 2 - The mass in grams of two moles of iron atoms is: 26.00 g 55.847 g 111.69 g 27.923 g 3 - The formula mass of nitric acid is given by: 31.50 g/mol 17.03 g/mol 63.01 g/mol 126.02 g/mol 4 - Sodium oxide has the formula: Na2O Na2O2 NaO2 Na4O2 5 - The correct name for (NH4)2SO4 is: Ammonium bisulfate Ammonium hydrogen sulfate Ammonium sulfate Ammonium (I) sulfate 6 - If the density of
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COPD which is Chronic Obstructive Pulmonary Disease is known as a condition that progressively makes it harder to breathe because the airflow into and out of the lungs is reduced. This usually occurs because the airways and air sacs lose their elastic quality‚ the walls between the air sacs are destroyed‚ the walls of the airways become swollen‚ or if the airways are clogged because they made more mucus than usual. Three main conditions of this disease are emphysema‚ chronic obstructive bronchitis
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ABSTRACT: Alpha-cypermethrin (a-CYP) is one of the most widely used insecticides. It may become an air pollutant and adversely affect the health. The present study was designed to determine whether treatment with N-acetyl cysteine (NAC)‚ a well-known antioxidant‚ can be useful for the management of the deleterious effects of a-CYP on lung tissues. For this purpose‚ thirty two male rats were divided into four different groups (eight rats for each). Group (I) gavaged with corn oil (control group)‚
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