Number Surname Other Names Examiner’s Initials Candidate Signature Question General Certificate of Secondary Education Higher Tier June 2013 Science A CH1HP H Unit Chemistry C1 Chemistry Unit Chemistry C1 Monday 10 June 2013 1.30 pm to 2.30 pm Mark 1 2 3 4 5 6 7 TOTAL For this paper you must have: a ruler the Chemistry Data Sheet (enclosed). You may use a calculator. Time allowed 1 hour Instructions Use black ink or black ball-point pen. Fill in the boxes at the top of this page
Premium Oxygen Carbon dioxide Copper
In the 18th and 19th centuries scientists wrestled with identifying and describing the nature of the “stuff” that produced change. One concept that became popular for a while was that of “caloric” (what we now call heat). “Caloric was originally conceived of as a quantity that would flow from a hotter object to a cooler one that would warm up as a result. It answered the need for a way for the cause of warming to get from here to there. Not only did caloric serve as a cause for warming‚ it
Premium Energy Thermodynamics Entropy
Appendix APPENDIX 1 Chemical tests for functional groups Homologous series/ Typical compound Functional group(s) Alkanes CH3CH3 ethane C – C and C–H Alkenes CH2 = CH2 ethene C=C Chemical tests/Observations Add liquid bromine in ultraviolet light (or sunlight): White fumes of HBr liberated; decolourisation of bromine occurs slowly (a) Add Br2 in CCl4 at room temperature: Decolourisation of bromine occurs immediately CH2 = CH2 + Br2 → CH2BrCH2Br (b) Add acidified
Premium Carboxylic acid Alcohol Sulfuric acid
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the June 2004 question papers 0420 COMPUTER STUDIES 0420/01 Paper 1‚ maximum raw mark 100 These mark schemes are published as an aid to teachers and students‚ to indicate the requirements of the examination. They show the basis on which Examiners were initially instructed to award marks. They do not indicate the details of the discussions that took place at an
Premium Computer Maxima and minima Credit card
Edexel IGCSE Chemistry Revision Notes IGCSE Chemistry Triple Award Revision Guide Topic Introduction to chemistry Atomic Structure Structure and Bonding – Ionic Bonding Structure and Bonding – Covalent and Metallic Bonding Organic Chemistry - Alkanes Organic Chemistry – Alkenes / Addition Polymerisation Organic Chemistry – Alcohols / Condensation Polymerisation Calculations Periodic Table Reactivity Series and Metal Extraction Electrolysis Energetics Acids‚ Bases‚ Salts and Neutralisation Preparing
Premium Atom Covalent bond
Chemistry Ozone Depletion Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth’s stratosphere (the ozone layer)‚ and a much larger springtime decrease in stratospheric ozone over Earth’s polar regions. The latter phenomenon is referred to as theozone hole. In addition to these well-known stratospheric phenomena‚ there are also springtime polartropospheric ozone depletion events. The
Premium Ozone depletion Ultraviolet
Power kites have been around for over 30 years‚ and in that time the sport of power kiting has progressed unbelievably‚ from the early forms of two line traction kites to the immense power of a 20 square metre surf power kite. We have watched the sport evolve and with it we have brought into our Power Kite shop and Power Kite School the top manufacturers to give the highest quality and best designed power kites in the world. There is no other sport which gives you such an adrenaline rush. Remember
Premium Kites
IGCSE ICT Revision What is Hardware? Hardware is the physical parts of the computer system – the parts that you can touch and see. A motherboard‚ a CPU‚ a keyboard and a monitor are all items of hardware What is Software? Software is a collection of instructions that can be ‘run’ on a computer. These instructions tell the computer what to do. Software is not a physical thing (but it can of course be stored on a physical medium such as a CD-ROM)‚ it is just a bunch of codes. An operating
Premium Computer network Personal computer Computer
N2O4(g) (colourless gas) When the equilibrium is heated at a constant pressure it gets browner. This must mean which of the following? a. Ke is very large d. both a and b b. it is endothermic e. both a and c c. it is exothermic ____ 6. Which equilibrium shows a decrease in [products] when the volume increases? I. 2H2(g) + O2(g) 2H2O(g) II. Cl2(g) + PCl3(g) PCl5 (g) III. H2(g) + I2(g) 2HI(g) IV. 2NH3(g) N2 + 3H2(g) a. I d. III and IV b. I and II e. II c. IV
Premium PH Ammonia Acid dissociation constant
atom‚ there are __________ paired and __________ unpaired electrons. A) 4‚ 2 B) 0‚ 5 C) 2‚ 5 D) 6‚ 1 E) 4‚1 2. Which of the following would have to gain two electrons in order to achieve a noble gas electron configuration? O Sr Na Se Br A) Sr B) Br C) Sr‚ O‚ Se D) Na E) O‚ Se 3. The electron configuration of the S2- ion is __________. A) [Ne]3s23p2 B) [Ne]3s23p6 C) [Kr]3s22p-6 D) [Ar]3s23p2 E) [Ar]3s23p6 4. The ion NO- has __________ valence electrons. A) 10 B) 16 C)
Premium Molecule Atom Electron configuration