physical or chemical changes. a) combustion of natural gas b) evaporation of alcohol c) condensation of water vapor d) photosynthesis e) splitting of carbon dioxide into carbon and oxygen f) formation of sodium chloride (NaCl) from it elements g) distillation of a sodium chloride solution to collect pure water 8. Record one a) qualitative and one b) quantitative observation about this page. State a theory about this page. 9. Give the name of the following types of containers a)
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products is likely to be: a) sodium ethanoate b) ethanoic acid c) ethanol d) butyl ethanoate 5. The correct name for the substance with the following structural formula is: H H O H H H-- C -- C -- C --- O -- C -- C -- H ethyl propanoate H H H H 6. The formula of ethanoic acid (C2 H4 O2) shows four hydrogen atoms‚ but it is a monobasic
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makes the solution acidic. Salts formed from a weak acid and a strong base hydrolyze to form a solution that is slightly basic. In this kind of hydrolysis‚ it is the anion from the weak acid that actually reacts with the water. For example‚ when sodium acetate‚ NaC2H3O2‚ hydrolyzes‚ water molecules react with the acetate ion: C2H3O2- + H2O ---------> HC2H3O2 + OH- The formation of the OH- ion from this reaction makes the solution basic. Salts formed from a week
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CHEMISTRY REVISION GUIDE for IGCSE Coordinated Science This revision guide is designed to help you study for the chemistry part of the IGCSE Coordinated Science course. The guide contains everything that the syllabus says you need you need to know‚ and nothing extra. The material that is only covered in the supplementary part of the course (which can be ignored by core candidates) is highlighted in dashed boxes: Some very useful websites to help you further your understanding include: •http://www
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How does light intensity affect the rate of photosynthesis? Poorly Pondweed Questions 1) How does light intensity affect the rate of photosynthesis? 2) How does temperature affect the rate of photosynthesis? sunlight carbon dioxide + water glucose + oxygen chlorophyll sunlight 6CO2 + 6H2O àààààà C6H12O6 + 602 chlorophyll Prediction I predict that the more intense the light‚ the higher the rate of photosynthesis. To photosynthesise‚ plants need light. It provides the energy for the process
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the number of atoms in: (a) 3 moles of phosphorus (b) 0.5 moles of sodium Answers (a) 1.81 x 1024 atoms (b) 3.01 x 1023 atoms Molecules Calculate the number of molecules in 6 moles of methane Number of Molecules = moles x molecules in 1 mole = 6 x 6.02 x 1023 molecules = 3.61 x 1024 molecules Calculate the number of molecules in: (a) 0.37 moles of sulphur dioxide (b) 3.4 moles of hydrogen chloride Answers (a) 2.23 x 1023 molecules (b) 2.05 x 1024 molecules
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fossil fuels are said to be this as we are using them up faster than they can be made Finite- these will run out if we continue using them Crude oil This fossil fuel is made up of a mixture of hydrocarbons. Hydrocarbons are compounds that contain hydrogen and oxygen atoms only a) b) In the exam you may be asked to identify hydrocarbons from their structure. You can see that a) is not a hydrocarbon as it contains oxygen as well Crude oil on its own is not useful but the hydrocarbons
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can be used to clean the chalk marks away so the board is blankagain. Shops usually sell blackboard chalk in sticks that are about 5 cm long. The main component of chalk is calcium carbonate (CaCO 3 )‚ a form of limestone. Limestone deposits develop as coccoliths (minute calcareous plates created by the decomposition of plankton skeletons) accumulate‚ forming sedimentary layers. Plankton‚ a tiny marine organism‚ concentrates the calcium found naturally in seawater from .04 percent to 40 percent‚
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insecticide and solvent | alcohol‚ wood | methyl alcohol - used as an antifreeze‚ solvent‚ fuel‚ and as adenaturant for ethanol | alum | aluminum potassium sulfate | alumina | aluminum oxide - As a filler‚ abrasive‚ effect pigment | antichlor | sodium thiosulfate - used for the neutralization of chlorine and/or Iodine solutions at your hatchery or aquaculture facility | antifreeze | ethylene glycol - used in applications ranging from consumer packaging‚ beverage containers‚ aircraft deicing
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to employ an open system‚ the free escape of carbon monoxide then driving the reaction to completion. In early experiments decalin was employed as solvent‚ but because the commercial product contains tetralin as an impurity‚ and perhaps because of hydrogen-transfer processes‚
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