Surname Centre No. Initial(s) Signature Candidate No. Paper Reference(s) 4335/1F Examiner’s use only London Examinations IGCSE Team Leader’s use only Chemistry Paper 1F Foundation Tier Monday 9 May 2005 – Morning Time: 1 hour 30 minutes 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 and candidate
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of the burning of coal. It is a very acidic oxide‚ producing sulphurous and eventually sulphuric acid when mixed with water‚ contributing to acid rain. In areas where there is a large amount of SO2 present‚ the rain pH can be as low as 3.5 whereas natural rain is about 5.6. This is 100 times more acidic. c. This harmful effect is noted by: Sulfur dioxide + water + sulphurous acid sulphuric acid SO2 + H20 H2SO3 H2SO4 Chemistry SCH3U-B‚ Unit 2‚ Lesson 8: Key
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Production of materials 1B – identify the industrial source of ethylene from the cracking of some of the fractions from the refining of petroleum Industrial source of ethylene (ethene) * Obtained from Crude oil – fractional distillation * Heated to high temps * Components vaporise and rise up tower where condense and collect * Lower the boiling point‚ higher up tower compound rises * Separates crude oil into fraction each with different boiling range - Catalytic Cracking
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The purpose of this lab was to clearly identify the reactivity of magnesium‚ zinc and copper. The metals reactivity will be exemplified as it will be tested with different solutions such as zinc sulfate (ZnSO4)‚ copper sulfate (CuSO4)‚ hydrochloric acid (HCL)‚ magnesium sulfate (Mg2SO4)‚ iron (II) sulfate (FeSO4) and tin (II) chloride (SnCl2). This will allow us in creating an activity series to visually see the reactivity when given single displacement reactions. An activity series is used to determine
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Science C.A.T Year 9 2014 Advanced by Sara Hamilton 9H Testing Vinegar – Acid Base Titration Aim The aim of this practical experiment was to pair up and measure the concentration of the acid in three different brands of vinegar. We added a base liquid‚ to the three different brands of vinegar until a neutralization reaction occurred. We conducted the experiment using the titration method. Hypothesis My hypothesis is that the vinegar that will have the highest acidic level will be Cornwell’s
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Al(OH)3+3NaNO3 5. Zinc & NH36. Al3+3NaOH Al+3NaNO3 7. 2Ca+ + 2NaOH Ca(OH)2 + 2NaNO3 8. 2 NaOH + Cu Cu2 + 2OH 9. Zn2+ 2NaOH Zn(OH)2+2Na Identify the cations that precipitate with hydrochloric acid and dissolve in the presence of ammonia -Iron Identify the cations that precipitate with hydrochloric acid and do not redissolve in the presence of ammonia -SILVER AND LEAD Identify the cations that precipitate upon addition of two or three drops of sodium hydroxide but re-dissolve upon addition
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Example Lab Report Experiment 4 1. Judith Anthony‚” Strong Acid/Strong Base Titrations”‚ CHEM 1130‚ T.A-Joseph Kreft‚ Tuesday 8am‚Room 1871‚Donna Ellitnorpe. 2. Purpose of this experiment: The purpose of this experiment is to observe the neutralization reaction that occurs between strong acid and strong base solutions. The technique of titration is used to observe the acid content of the fluid in a car battery. 3. Procedure: Calculate the volume of 6.00 M NaoH that is needed
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PART THREE Renal Acid-Base Balance 1 Acid • • • • An acid is when hydrogen ions accumulate in a solution. It becomes more acidic [H+] increases = more acidity CO2 is an example of an acid. HCl 2 H+ H+ ClH+ H+ ClH+ 7 ClpH ClCl- As concentration of hydrogen ions increases‚ pH drops Base • A base is chemical that will remove hydrogen ions from the solution • Bicarbonate is an example of a base. NaOH Na+ OH- H + ClH+ ClNa+ OHH+ ClH+ Cl- Na+ OHH+ ClNa+ OH- 2 7 pH Acids and basis neutralize
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CAWANGAN PULAU PINANG SKEMA JAWAPAN MODUL LATIHAN BERFOKUS SPM 2013 KIMIA KERTAS 1 454111 www. myschoolch ild ren .com ::‚ Muat turun (percuma) soalan lain di : www.myschoolchildren.com Muat turun (percuma) skema lain di www.myschoolchildren.com MAJLIS PENGETUA SEKOLAH MALAYSIA 1 1 B 11 D 21 B 31 C 41 A 2 D 12 B 22 A 32 A 42 A 3 D 13 D 23 D 33 B 43 D 4 A 14 B 24 C
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Acids vs Bases In chemistry‚ when some elements are mixed‚ the compounds that are formed can be classified depending on its characteristics‚ just like acids and bases. Acids are defined as compounds that donate a hydrogen ion‚ H+‚ to another compound. Bases are the chemical opposite of acids. They both are different in many ways. One way in which acids and bases differ is the pH and the pOH. The pH is a number used to denote the hydrogen-ion concentration‚ or the acidity‚ of a solution. In the
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