that we had a change in color and a solid precipitate. 3. Na2CO3(aq)+ HCl(aq) → NaCl(aq) + HCO3(aq) Na2CO3 + 2HCl → 2NaCl + H2O + CO2(aq) 2Na+ + CO32- + 2H+ + 2Cl- → 2Na+ + 2Cl- + H2O + CO2 CO32- + 2H+ → H2O(l) + CO2(g) With this reaction the carbonate and the diatomic hydrogen combined together to make the bubbling effect that we had noted. This leaves us with the water molecule with the sodium chloride dissolved in it with the carbon dioxide gas bubbles. 4. NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
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Topic 10 Rate of Reaction Part A Unit-based exercise Unit 36 An introduction to rate of reaction Fill in the blanks 1 concentration; time 2 instantaneous 3 a) the gaseous product / carbon dioxide evolved b) loss in mass 4 a) colorimeter b) standard alkali c) the gaseous product / carbon dioxide evolved 1 time to reach the opaque stage 5 transmittance; 6 hydroxide; titrimetric True or false 7 T In the oxidation of methanoic acid by bromine‚ the intensity of the orange colour of bromine
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1 Model Question Paper Basic Engineering and Sciences The material in which spontaneous polarization changes with temperature is known as (1) Piezo electric (2) Ferro electric (3) Pyro electric (4) Magneto optic Where K and s are thermal and electrical conductivities in a solid‚ according to Wiedemann Franz law 1. The theorem used for equilibrium of concurrent 8. coplanar forces is (1) Varignon’s Theorem (2) Lame’s Theorem (3) Parallel Axis Theorem
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supported by underlying dentin. Ninety-six percent of enamel consists of mineral‚ with water and organic material composing the rest. The normal color of enamel varies from light yellow to grayish white. Enamel’s primary mineral is crystalline calcium phosphate. The large amount of minerals in enamel accounts its strength.DentinDentin is the tissue between enamel or cementum and the pulp chamber. It is secreted by the odontoblasts of the dental pulp. Dentin is a mineralized connective tissue with
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metal is). The more reactive the metal‚ the more difficult it is to extract. Thus electrolysis would be used more the more reactive and the “Blast Furnace” for the less: Metal Method of Extraction Potassium Electrolysis Sodium Electrolysis Calcium Electrolysis Magnesium Electrolysis Aluminium Electrolysis Zinc Heat with C or CO Iron Heat with C or CO Lead Heat with C or CO Copper Roasting in air Silver Occur naturally Gold Occur naturally Out of all the methods‚ native
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experiment‚ the online simulation was used to determine which substances were endothermic or exothermic when dissolved in water. According to the simulation‚ sodium chloride and ammonium chloride was observed to be endothermic. Calcium chloride‚ sodium acetate‚ sodium carbonate‚ and lithium chloride was observed to be exothermic. As sodium chloride and ammonium chloride was observed to be endothermic‚ those two salt substrates was not used in the experiment as the goal of the experiment was to increase
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Bellamar Caves are a National Monument that is located in Matanzas‚ Cuba‚ they are a set of cave with more than 23 kilometers of galleries. By the beauty of its gallery and caves‚ they were declared a National Monument. The galleries and passages of the cave started forming about 300 thousand years ago. According to the studies the caves were originally under the sea‚ part of the bat of Matanzas. While they were under sea level‚ these caves were full of water. The tectonic movements caused the area
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April-May ranges from 36~42°C arid mean minimum temperature during winter ranges from 15-24° centigrade. Semi-arid to sub-humid‚ tropical to sub-tropical monsoon type climate with alternate dry and wet periods and calcification (formation of calcium carbonate) are favourable to the formation of black soils. The soils are characterised by dark grey to black colour with 35-60% clay‚ neutral to slightly alkaline reaction‚ high swelling and shrinkage‚ plasticity‚ deep cracks during summer and poor status
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except; PbCl2 - lead(II) chloride (dissolve in hot water) AgCl - argentums/silver chloride HgCl - hydroargentum chloride‚ mercury chloride Sulphate All sulphate salt dissolve in water except; PbSO4 ‚ BaSO4 ‚ CaSO4 Carbonate All carbonate salt not dissolve in water except; Li2CO3 Na2CO3 ‚ K2CO3 ‚ (NH4)2CO3 Oxide All oxide not dissolve in water except; Na2O ‚ K2O ‚ CaO Hydroxide All hydroxide not dissolve in water except; NaOH‚ KOH‚ Ca(OH)2 ‚ Ba(OH)2 Formula to
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water and then with the alkali. Rinse with tap water and then with distilled water. Rinse with tap water and then with the acid. Rinse with the alkali. The labels fell off two bottles each containing a colourless solution‚ one of which was sodium carbonate solution and the other was sodium chloride solution. The addition of which solution to a sample from each bottle would most readily enable the bottles to be correctly relabelled? A B C D ammonia hydrochloric acid lead(II) nitrate sodium hydroxide
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