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5129 w14 qp 22 100%
aerobic anaerobic glucose minerals kidney muscle carbon dioxide lactic acid oxygen energy lung water Each word may be used once, more than once or not at all.
5090 s10 qp 11 97%
A purple leaves and poor root growth B small leaves and thin stem C white upper leaves and normal lower leaves D yellow stem and yellow leaves © UCLES 2010 5090/11/M/J/10 5 6 The graph shows the rate of photosynthesis of a plant at increasing light intensities at two different carbon dioxide concentrations.
5090 w06 qp 1 95%
A B substrate enzyme C 5 D The graph shows the effect of changing light intensity on the rate of photosynthesis in a plant at two different carbon dioxide concentrations.
5070 w13 ms 21 95%
Page 2 Mark Scheme GCE O LEVEL – October/November 2013 Syllabus 5070 Paper 21 A1 (a) iron(II) chloride (1)  (b) carbon dioxide (1)  (c) nitrogen dioxide (1)  (d) calcium oxide (1)  (e) carbon dioxide (1)  (f) silver chloride (1)  [Total:
- Solidified carbon dioxide blasting is the greatest surface area cleansing procedure, it leaves no secondary waste stream behind.
5070 s11 ms 21 94%
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) (e) Mol ratio Cu:O =  79.9 20.1 :
5129 w09 ms 2 93%
Teachers’ version GCE O LEVEL – October/November 2009  (b) oxygen / O2  (c) (i) carbon dioxide / CO2 water / H2O / steam (either order)   (d) oxides of nitrogen / lead (compounds) not sulfur dioxide / carbon monoxide / carbon dioxide (a) carbon dioxide / CO2 oxygen / O2 (correct order)   (b) (i) carbon dioxide (level) / temperature / the plant not light (ii) graph increasing with increasing intensity maximum being reached / levelling off independent marks;
- Solidified carbon dioxide blasting is the best area cleaning process, it leaves no second waste flow behind.
5070 w09 qp 2 93%
ammonium sulfate calcium oxide copper(II) chloride ethanoic acid ethene nitrogen dioxide sodium iodide sulfur dioxide Each compound can be used once, more than once or not at all.
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used up produced remain A carbon dioxide water oxygen B chlorophyll carbon dioxide water C oxygen starch cellulose D water oxygen chlorophyll © UCLES 2013 5090/12/O/N/13 [Turn over 4 6 The graphs show how two different conditions affect the rate of photosynthesis.
5090 s11 qp 12 92%
amylase solution A pepsin solution and hydrochloric acid agar jelly B D amylase solution and hydrochloric acid C pepsin solution © UCLES 2011 5090/12/M/J11 [Turn over 4 6 The graph shows the effect of carbon dioxide (CO2) concentration on the rate of photosynthesis.
5070 s14 qp 21 92%
CH4(g) + 2O2(g) CO2(g) + 2H2O(g) The combustion of the hydrogen sulfide forms water and sulfur dioxide.
He used a kegging process, but instead of pressurizing the keg with carbon dioxide, he pressurized it with helium.
5090 s11 qp 11 91%
The graph shows the effect of carbon dioxide (CO2) concentration on the rate of photosynthesis.
AS(8080) Chemistry 6243.02 3B Tables Questions Student Conference March 2006 1 Flame tests FLAME COLOUR yellow or orange lilac carmine(red) yellow-red crimson pale green INFERENCE sodium ion potassium ion lithium ion calcium ion strontium ion barium ion 2 Identification of gases GAS oxygen carbon dioxide sulphur dioxide ammonia nitrogen dioxide hydrogen hydrogen chloride chlorine bromine iodine water vapour OBSERVATIONS colourless gas which relights a glowing splint colourless gas which gives a white ppte with limewater colourless gas which is acidic and decolourises acidified potassium manganate(VII) and turns acidified potassium dichromate(VI) orange to green colourless gas which turns moist red litmus paper blue brown gas colourless gas which ignites with a “pop” steamy fumes on exposure to moist air, acidic.
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2 3 A 1 only B 1 and 3 C 2 only D 3 and 4 Through which organs do carbon dioxide molecules, magnesium ions and nitrate ions enter plants?
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carbon dioxide in the atmosphere animals, plants and microorganisms produce carbon dioxide plants use carbon dioxide to make sugar animals eat other animals animals eat plants animal and plant remains are decomposed by microorganisms Fig.
5070 w13 qp 21 89%
calcium oxide carbon dioxide carbon monoxide copper(II) sulfate ethanol ethene iron(II) chloride iron(III) chloride nitrogen dioxide silver chloride silver iodide sulfur dioxide Each compound can be used once, more than once or not at all.