Surname Centre Number Candidate Signature Other Names Candidate Number For Examiner’s Use General Certificate of Secondary Education June 2007 SCIENCE B Unit Chemistry C1 CHEMISTRY Unit Chemistry C1 Higher Tier Thursday 21 June 2007 1.30 pm to 2.15 pm CHY1H H For Examiner’s Use Question Mark Question Mark For this paper you must have: a ruler. You may use a calculator. Time allowed: 45 minutes Instructions Use blue or black ink or ball-point pen. Fill in the boxes at the top of
Premium Management Health care Psychology
ely began foaming up and overflowing from the bowl. I also made a ziploc bag explode too. Questions and conclusions: Part I: Reaction between iron and oxygen 1.Write a balanced equation for the reaction between iron and oxygen. 4Fe + 3O2 —> 2Fe2O3 2.Classify the reaction that occurred between the iron and oxygen. Apply this reaction to a realworld situation. It’s oxidation. Oxygen oxidizes from Fe to Fe3+. As for a realworld situation‚ well‚ rusting is a realworld application
Premium Oxygen Iron Carbon dioxide
reaction that occur when the breath is blown through limewater. CO2(g) + Ca(OH)2(aq) CaCO3(s) + H2O(l) 5. Complete and balance the following (assume that complete oxidation occurs). a. CH4 +2O2 CO2 +2H2O b. C3H8 + 5O2 3CO2 +4H2O c. 2CH3OH + 3O2 2CO2 + 4H2O 6. What is the basis of the cleaning process in self-cleaning ovens? It basically burns everything in your oven into ash. You can then just wipe it up easily with a damp cloth (after it cools of course). 7. Urine contains appreciable
Free Carbon dioxide Oxygen
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
Premium Carbon dioxide Sulfuric acid Ammonia
Experiment 15 Title: Equilibrium studies Objective: 1. To study the effect of concentration and temperature changes on equilibrium. 2. To predict the direction of the net reaction in an equilibrium system by Le Chatelier’s principle. Results: Part 1 (a): Effect of temperature changes on equilibrium Cu(NO3)2 (aq) Cu(NO3)2 (s) The color of the solution = dark blue with precipitate When placed in water bath 60oC When placed in ice bath The level of the solid
Premium Purple Ammonia Ion
EXPERIMENT – 9 To Prove that Light is Necessary for Photosynthesis. Aim : To show experimentally that light is necessary for photosynthesis. Requirements : A potted plant‚ iodine solution‚ black paper strip‚ paper clips‚ water bath. EXPERIMENT PLEASE VIEW THE ANIMATION FILE FOR THE PROCEDURE Observation : 1) The region of the leaf which was exposed to sunlight turns blue in colour. 2) The region of the leaf covered with black strip turns brownish in colour
Premium Photosynthesis Oxygen Carbon dioxide
4541/2 No. 1. (a) (i) (ii) Answer Zinc Mark 1 1 1 1 1 1 1. The presence of X/zinc atoms disrupts the orderly arrangements of copper atoms 2. This reduce the layers of atoms from sliding over one another easily Steel Silicon dioxide/silica /sand Heat resistant/can withstand with high temperature (iii) (b)(i) (ii) (c) (i) H Cl | | C == C | | H H 1 (ii) (iii) Polyvinyl chloride/ polychloroethene polymerization TOTAL 1 1 9 No 2(a) (b) (c)(i) Answer Horizontal row of elements in the Periodic
Premium Sulfuric acid Alcohol Chlorine
A firework is an incendiary device or material that can be used forsignalling orentertainment. There are chemicals located in the nose ofthe rocket that explode‚ producing the colours seen. The art of fireworks‚ first originated in ancient China‚ with thefirst explosive being made from a mixture of black powder during theSung dynasty. It is believed that the explosive mixture was created bya combination of sulfur‚ saltpeter and charcoal. The Chinese foundthat the combination of these ingredients
Premium Chemical reaction Fireworks Chemistry
is -1400 kJ/mol. (iii) Calc. the ∆Hc of methanol given its ∆Hf is -239 kJ/mol. (iv) Calc. the ∆Hf of Carbon Monoxide ‚given its ∆Hc is -284 kJ/mol. (v) Calc. the ∆Hf of carbon disulphide‚ given: S(s) + O2(g)→SO2(g) ‚ ∆H = -294 kJ/mol CS2(l) + 3O2(g)→CO2(g) + 2SO2(g) ∆H = -1072 kJ/mol 6. Use the following Bond Energies/ kJ/mol: Calculate the std. enthalpy change for the following reactions: (i) C2H4 (g) + H2 (g) →C2H6 (g) (ii) the combustion of 1 mole of CH4. 7. Calculate
Premium Energy Enthalpy Carbon dioxide
occurs when Oxygen (O) comes into contact with iron (Fe). Overtime‚ the oxygen reacts and combines chemically with the iron‚ forming a substance named Iron Oxide (Fe2O3)‚ which weakens the physical bond of the iron.[2] Chemical Equation of Rust: 4Fe + 3O2 --> Fe2O3[3] To maximize rust‚ a certain level of moisture is needed in the air (humidity level). To minimize rust‚ there needs to either be a block to reduce contact between iron and oxygen‚ or to coat the iron with an element that reacts to oxygen
Premium Iron Oxygen Metal