Centre Number Surname Other Names Candidate Signature Candidate Number For Examiner’s Use Examiner’s Initials Question Mark General Certificate of Secondary Education Foundation Tier June 2011 1 2 3 4 5 6 7 TOTAL Additional Science Unit Chemistry C2 CHY2F Chemistry Unit Chemistry C2 Wednesday 25 May 2011 For this paper you must have: the Data Sheet (enclosed). You may use a calculator. F 9.00 am to 9.45 am Time allowed 45 minutes Instructions Use
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| AgNO3 | Reaction | Reaction | Reaction | Reaction | | BaCl2 | No reaction | Reaction | Reaction | Reaction | | MgCl2 | No reaction | No reaction | Reaction | Reaction | Data Balanced equations: SrCl2 (aq) + KCl (aq) NO REACTION SrCl2 (aq) + Na2SO4 (aq) SrSO4 (s) + 2NaCl (aq) SrCl2 (aq) + 2NaOH (aq) Sr(OH)2 (s)+ 2NaCl (aq) SrCl2 (aq) + Na2CO3 (aq) SrCO3 (s) + 2NaCl (aq) AgNO3 (aq) + KCl (aq) AgCl (s) + KNO3 (aq) 2AgNO3 (aq) + Na2SO4 (aq) Ag2SO4 (s) + 2NaNO3 (aq) AgNO3 (aq)
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strong purple color | I | HCI and phenolphthalein | The change of the liquid from no-color to white shows that´s an acid‚ if it gets combines with a base like the number h the color became strong. | J | NaOH and AgNO3 | It creates brown crystals and all the liquid gets brown. | K | AgNO3 and NH3 | It has no changes‚ when the chemic get combine but whit the light exposition the paper towel gets brown. | L | NH3 and CuSO4 | It becomes light blue and it seems heavier | F | rise | black | presence
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solutions: Copper (II) nitrate‚ Cu(NO3)2 Lead (II) nitrate‚ Pb(NO3)2 Zinc nitrate Zn(NO3)2 Magnesium nitrate‚ Mg(NO3)2 Silver nitrate‚ AgNO3 Fine sandpaper Goggles Lab apron Directions: Fill in your observations from the videos and pictures in the table below. DATA TABLE Aqueous Nitrates Metals Mg(NO3)2 Zn(NO3)2 Cu(NO3)2 Pb(NO3)2 AgNO3 Mg Zn Cu Pb
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turned to dark brown G. KI + Pb(NO3)2 9A Turned from clear to opaque yellow H. NaOH + phenolphthalein 10A Turned from clear to rose color I. HCl + phenolphthalein 11A No color change‚ clear and transparent J. NaOH + AgNO3 12A Turned from clear to translucent light gray K. AgNO3 + NH3 1B Many tiny particles forming on the bottom for 3 minutes‚ then disappeared after exposure to bright light L. NH3 and CuSO4 2B Turned from clear to opaque light blue Part F: Testing of Various Foods with
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chemical equations into sentences. a. CS2 (l) + 3O2 (g) → CO2 (g) + 2SO2 (g) Liquid carbon disulfide reacts with elemental oxygen to yield carbon dioxide gas and sulfur dioxide gas. b. NaCl (aq) + AgNO3 (aq) → NaNO3 (aq) + AgCl (s) Solutions of sodium chloride and silver nitrate react to yield aqueous sodium nitrate and solid silver chloride. 5. Write the chemical equation for the reaction of elemental zinc with hydrochloric
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halide contamination washes must be performed until the water does not result in cloudiness and is pure. B) The compound that is causing the cloudiness in the dichloromethane and AgNO3 is the aqueous layer that was removed using the separatory funnel. The compound that is precipitating from the aqueous solution is AgNO3. C) 6. The toxic effects of 1-methylimidazole on humans include; damage to upper respiratory tract‚ eyes and skin. Other toxic effects of 1-methylimidazole on humans is that
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Turns green E Blue dye and NaOCl Stays blue – no change F NaOCl and KI Turns pale orange/yellow G KI and Pb(NO3)2 Milky yellow solid H NaOH and phenolphthalein Turns bright pink I HCl and phenolphthalein Bubbles- cloudy J NaOH and AgNO3 Solid formed/ turned brown K AgNO3 and NH3 No change L NH3 and CuSO4 Tiny particles/ blue Questions Use what you learned in this lab to answer the following questions: A. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate)
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Name : Rebecce C. Deocampo Date : September 2‚ 2013 Course/Yr. : BS Chemistry III Sched : MF 7-10‚ Group#2 Experiment No. 1 Synthesis and Reactivity of Tert-Butyl Chloride I. Objectives : 1. To produce tert-butyl chloride from tert-butyl alcohol 2. To understand the SN1 and SN2 mechanism involved in the reaction 3. To determine the yield of percentage of t-butyl chloride II. Introduction An alkyl halide is a derivative of alkanes. Alkanes are hydrocarbons with a
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Extracting sliver from used X-ray films using new techniques SUMMARY Silver is one of the precious metals that exists as silver halides and dark silver in X-ray films therefore recycling it is essential. I decided to carry out my research in the field of extracting silver from used X-ray films using new technique that dose not deplete ant metallic resources or energy resources meaning that the project must be environmentally friendly. My research consists of two parts‚ part one which is carrying
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