2011 Syllabus 5070 Paper 21 A1 Allow correct name but formula takes precedence (a) V2O5 (1) (b) ZnSO4 (1) (c) AgI (1) (d) CF3Cl3 (1) (e) (NH4)2SO4 / ZnSO4 (1) (f) CH4 (1) (g) (NH4)2SO4 (1) [1] [1] [1] [1] [1] [1] [1] [Total: 7] A2 (a) sulfur dioxide (1) Allow SO2 (b) copper(II) sulfate (1) Allow CuSO4 (c) H+ + OH– → H2O (1) Ignore state symbols (d) (i) Copper(II) hydroxide (1) Allow Cu(OH)2 (ii) Cu2+(aq) + 2OH–(aq) → Cu(OH)2(s) Balanced equation (1) Correct state symbols (1) [1] [1]
Premium Oxygen Carbon dioxide General Certificate of Secondary Education
air nitrogen oxygen The substances that make up the air Air is a gas. It is a mixture of lots of different substances‚ which are all gases. The most common gases in air are nitrogen‚ oxygen and argon. There is also water vapour‚ carbon dioxide and many other
Premium Oxygen Hydrogen Carbon dioxide
ANALYSIS PROXIMATE ANALYSIS ASH DEFORMATION POINTS Initial deformation temp. Softening temp. Hemispherical temp Fluid temp. LIQUID FUELS PROPERTIES HEATING VALUE FLASH POINT IGNITION POINT (SELF‚ FORCED) VISCOSITY POUR POINT SULFUR ASH Refinery process Distillation GASEOUS FUEL PROPERTIES HEATING VALUE COMPOSITION DENSITY BASIS OF ANALYSIS AS RECEIVED Ultimate C +H +O +N +S +A +M =100 Proximate VM +FC +M +A = 100 AIR DRY [100C/(100-Ma)] DRY
Premium Coal Carbon dioxide Natural gas
term for the residues left during the combustion of coal. Depending on the source and makeup of the coal being burned‚ the composition of the coal ash vary considerably‚ but all includes substantial amounts of both amorphous and crystalline Silicon dioxide (SiO2) and Calcium oxide (CaO)‚ both being endemic ingredients in many coal-bearing rock strata. Coal ash is made up of two types of combustion by-products: bottom ash and fly ash. Bottom ash is a coarse‚ granular‚ incombustible by-product that
Free Carbon dioxide Oxygen
nitrogen 78% - oxygen 21% - co2 0.04% - argon 0.9% - other gases v small amounts gas levels - co2 rises due to burning fossil fuels + deforestation - co rises due to incomplete combustion of fossil fuels - so2 rises due to volcanoes + burning sulfur impurities - methane rises due to cattle waste gases - nitrogen oxides rise due to lightning + car engines rocks - igneous formed when magma or lava cool to form solids - large crystals mean the rock cooled slowly - small crystals mean the
Free Carbon dioxide Oxygen Carbon
greenhouse gases occur naturally in the atmosphere‚ while others result from human activities that add to the levels of most of these naturally occurring gases. Naturally occurring greenhouse gases include water vapor‚ carbon dioxide‚ methane‚ nitrous oxide‚ and ozone.[ Carbon dioxide is released into the atmosphere when solid waste‚ fossil fuels such as oil‚ natural gas‚ and coal‚ and wood and wood products
Premium Greenhouse gas Carbon dioxide Natural gas
2011 Title: Analysis of the Elements present in Organic Compounds Aims: To test the presence of Carbon‚ Hydrogen‚ Oxygen‚ Nitrogen and Sulfur in Organic Compounds Introduction: Organic Compounds can be considered as any compound containing carbon atoms covalently bonded with other atoms‚ usually hydrogen. Other atoms may include oxygen‚ nitrogen‚ sulfur…etc. They can be found in nature‚ since “organic” means present in‚ or derived from‚ plants and animals. Materials/ Apparatus: Bunsen
Premium Ammonia Oxygen Carbon dioxide
solutions of lead (II) chloride and sodium chromate react to yield solid lead (II) chromate and aqueous sodium chloride. 3. Write the chemical equations for the following reactions. a. When heated‚ solid calcium reacts with solid sulfur to produce solid calcium sulfide. Δ Ca (s) + S (s) → CaS (s) b. Hydrogen gas reacts with fluorine gas to produce hydrogen fluoride gas. H2 (g) + F2 (g) → 2 HF(g) c. Solid aluminum metal reacts with aqueous
Premium Chlorine Oxygen Carbon dioxide
tons of pollutants. The level is usually given in terms of atmospheric concentrations or‚ for gases in terms of parts per million‚ that is‚ number of pollutant molecules per million air molecules. Many come from directly identifiable sources; sulfur dioxide‚ for example‚ comes from electric power plants burning coal or oil. Others are formed through the action of sunlight on previously emitted reactive materials. For example‚ ozone‚ a dangerous pollutant in smog‚ is produced by the interaction
Free Air pollution Oxygen Atmosphere
most of the organic material‚ which may also explode. It reacts with non-metallic elements except for nitrogen‚ oxygen‚ noble gases‚ silicon and halogens. It oxides them to their highest oxidation states(3) as acids with the formation of nitrogen dioxide for concentrated acid and nitric oxide for dilute acid. Chromium (Cr)‚ iron (Fe) and aluminium (Al) dissolve in dilute nitric acid‚ which the concentrated acid forms a metal oxide layer that protects the metal from further oxidation‚ and it is called
Premium Nitric acid Oxygen Sulfuric acid