初三化学练习册答案(上海)The first semester of ninth gradechemistryChemistry makes the world a better place(a)(1)make a dazzling white powder(2)clarify the lime water turbidity(3)it produces a lot of bubbles2.B. Magnesium belt combustion produces new chemicals that are chemical changes, and physical changes may also have a glowing g 1 owC, C, C, C, C, C, C, CEvery one of them has a good time(1)there was no chemical change. Because the water in the sea is vaporized, it causes the salt to be precipitated out.(2)there was no chemical change. Because a candle melts and vaporizes does not produce a new substance.White and white solid white powder, white powder white oxide powderB 2.3. B(1)a tube holder will burn the test tube(2)it is not obvious that the experiment of boiling water in a beaker is too long(3)the glue head dropper tube is inserted into the test tube to contaminate the pipe5. B6. A.It is difficult to clarify the calcium carbonate of calcium carbonateCalcium carbonate produces a large amount of carbon dioxide and carbon dioxide sticks out9. B10.The BCGarbage classification nameConcrete garbage (filling sequence number) Organic waste4 5 9 10metalplasticharmfulrecycled1 7June 1182,3,12. A littleEnter the chemistry lab(a)The solution turns red and the solution is red and colorlessBlue and blue precipitation disappearsReignite oxygen with a Mars bar9. BDThe formation and dissolution of the gas generation precipitation by the change of colorThe experimental results of experimental experiments in experimental products were concluded(2)(1)tube beaker with a round bottom flask cone(2)a, b, d, b, d2. C3.AB(1)the alcohol on the wick is not easily lighted and wasted(2)the liquid will overflow(3)a large amount of heat will explode at the bottom of the cylinder(a) the cork is on the table with the cork on the table (2) the label should be held in the palm of the hand(b) (1) the test tube should be tilted when the test tube is not tilted when heated(2) the liquid in the test tube should be less than a third of the test tube6. D7. A littlePurification of the substance1 〜8 C BC AD C, C, C, C, C, C, C, C, d, C, C, d, C, CThe drainage causes the liquid to accelerate and dissolve in a small amount of liquidSlightly 10.(1)the volume reading generates an error(2)the liquid will flow out of the gap between the filter paper and the funnel(3)the solid after the drying is easy to spill13. BDThe world，s most common chemical language(2) H (4) Na (5) Cu (6) AlCD 2.3.The element nameheliumphosphoruspotassiumsymbolCNSiWith recentThe Ca5.BD6.AD7.The name of the nitrogenCarbon monoxide hydrogen Chemical formula H20MgMgO style Material categoryelemental compound compoundelemental7.(1) the calcium(2)iron(3)the sulfur⑷P8. D9.(1) Mg 02 MgO style (2) C02 H20(1)sodium chloride(2)NaOH(3)Cu (OH) 2 CuS04 H20(4)CaO H20This chapter test5 C, C, D, C, A6 to 10, B, D, C, A, B11.The name of thenitrogensodiumbariumsymbols.With recentPMetal or non-metallic elements Nonmetallie elements Nonmetallie elementsMetal elementsMetal elementsNonmetallie elementsMetal elements12.The name of theoxygenmagnesiaCarbon dioxideChemical formulaCOH20FeSingle matter or compoundcompound compoundcompound elementalcompound13. A littleThe second is the last(1)carbon + oxygen fuels carbon dioxideC C02 + 02 lit(2)carbon dioxide and carbon monoxideThe C02 + C high temperature CO16.(1)take a small amount of water and let the filter paper stick to the inner wall of the funnel and the filter paper should be below the edge of the funnel(2)preheat and heat upThere is no vertical drop in the test tube, which will cause the liquid to drop out of the tube by one third of the volume of the tube, and the liquid will overflow when heated18.Take quality such as diamond and graphite after fully burning in oxygen are only a product of carbon dioxide, and carbon dioxideare equal, the quality of the diamond and graphite is the elemental carbon19. A littleThe vast expanse of the atmosphereThe air that people live on(a)1.10 * 1. 76 nf * 5 g 二88 g2. D3.ABF CDE4.Don，t agree. If red phosphorus is not deficient, it cannot completely consume the oxygen in response.A chemical that is stable in helium gas krypton is able to emit a different color when it is energized(1) it will clarify the lime-water exposure in the air, and a few days later the lime-water turbidity will show that there is carbon dioxide in the air (2) put a drink in the freezer, put up in the air in an hour, bottles of outside wall will have small water droplets, that is water vapor condensation in the air 7. ADE(2)1 〜3 CBB0 Si Fe Al Na calcium hydrogen potassium magnesium copper Cobalt 5.02 makes up two oxygen atoms03 makes up three oxygens(1)03, 16 * 3 = 48(2)24 + 16 = 40 MgO style(3)N2, 14 * 2 = 28(4)CaC03 40 + 12 + 16 * 3 = 1002.2 magic oxygen(a)1.You need oxygenYou need to get rid of oxygenHelp breathingPut out the fireFuel combustionRust preventionThe strips of wood will be ignited into nitrogen and oxygen, the wood in the oxygen will burn more, and the wood in nitrogen will go out3. D4. D5. A.6. BThe reaction of matter in pure oxygen is more intense than in airThe experimental stepsThe phenomenon of conclusionPut the lighted sticks in three gasesOne bottle of wood went out slowly and one of the wooden bars went outThe slow quenching of the air is that the oxygen is extinguished by nitrogen(2)1. A.B 2.3. D4.Name of the material Chemical formulaKC1O3Mn0202H202KC1Material category compoundoxideelementaloxideoxidecompoundType the amount122.58732341874. 54. A little5.(1) hydrogen peroxide under certain conditions of oxygen generated in the reaction (2) the heating can increase the reaction rate of hydrogen peroxide to produce oxygen (3) manganese dioxide can speed up the reaction of hydrogen peroxideThe conservation of mass in chemical changes(а)(1)hydrogen and oxygen(2)there are 2 hydrogens and 1 oxygen(3)2:1⑷"⑸18(б)88. 9%2.(1) NH4HC03(2)17. 7%(3)20.1 percent is more than fake advertisingS02 CuO Na20 NaCl Mg (Oil) 2 CuS044.(1) the MgO style⑵Ne(3)the A1C135.(1) 02⑵Cu(3)the CuO(4)H206.(2)1. 6. 02 * 10 " 23 6.02 * 10 " 3 * 6.02 * 10 " 5 23 242.Molecular weight g/Moorish 28 grams/Moore 56 g 1. 204 * 10243.2:6:1 guidance: 16 184 4 * 6. 02 * 10 " 234.(1) 4 * 6. 02 * 10 " 23 = 2.408 * 10 " 242223 (2) 0. 05 * 6.02 * 10 " = 3.01 * 10(1)0.2 * 98 = 19. 6 g(2)5 * 27 = 135 g6.(1) 88/44 = 2 mol(2)4/40 = 0. 1 mol7.16/80 = 0. 2 moles (32 + 32)= 12. 8 grains8. B9. A.Slightly 10.(3)1. 0. 96 0. 03 1.806 * 10 " 22Carbon, hydrogen and oxygen3. B(3)the mass conservation of the material before and after the reaction(4)the number of atoms before and after the reaction is the same as two magnesium atoms and two atoms of oxygen(5)for every 2 moles of magnesium, you need 1 mole of oxygen, and you produce 2 moles of magnesium oxide(1)1, 2, 1, 2(2) 1 2 3(3) 2 1 2(1)2C0 + 02 igniting 2C02(2) C + H20 hot CO + H2(3)Cu2 (OH) 2C03 heats up 2CuO + H20 + C02Let's say we need oxygen X moles to produce MgO Y moles2Mg + 02 to ignite 2MgO2/2 = 1 / XX = 1 mol,1/1=2/ YY = 2 mol,Answer: need 02 1 mole, produce MgO 2 molThis chapter test1to 6 times the square root of the square root of that15 ABABD CADDBoth hydrogen and oxygen atoms consist of two hydrogen atoms and one oxygen atom, and hydrogen peroxide has two oxygen atoms and two hydrogen atoms3 162 17.18. 1:2:1 60 1.204 * 10 " 24Blue violet S + 02 ignited S02 0. 05 0. 05Liquid - 195.8 neon, helium(1)test-tube alcohol lamp iron stand(2)2KMnO4 heating K2MnO4 + Mn02 + 02(3)the gas that C begins to discharge cannot be collected, etc., which produces a large number of continuous bubbles to be collected, and when there is a lot of bubbles in the gas cylinder, stop collecting(4)2KC103 heating (Mn02) 302 up + 2KC1(5)high quality such as potassium chlorate and manganese oxidewere taken, no longer reduces fully heated to solid, and weighing the quality of the remaining solid, compared with the reaction before quality, the difference is the difference of oxygen22. Take four cylinders, respectively in 1/2 volume of water, two-thirds of the volume of water, 4/5 of the volume of water, collect the reoccupy drainage method, the required gas volume can be subjectStep 3 into the solution world3. 1 the water(a)1 〜4 BBDCVolatilization, precipitation, filtration, adsorption alum chlorine gas6 〜9 AABDH2 02 2 1 2:1Heat capacity — the temperature difference between temperature and temperatureAnomalous expansion - ice floats on the surface of the waterAssociative dispersionCaO + H20 - Ca (OH) 2I.Colorless, tasteless, the density of liquid, 1 * 10 3 kg/cm3, freezing point 0 °C ice, steam and poor conductor is 100 °C2〜8 CDDCDBCalcium oxide gradually disappeared from phenolphthalein and calcium hydroxide as an alkaline solution10. 5. 1 mlII.(1) 6 mol,(2) 100. 8 g3.2 solution(a)1 〜5 CCBDB6.BDAdd sodium nitrate to cool the evaporation water8.Take two beakers respectively each 100 g to 100 g cool water 80 °C hot water, add solid ammonium chloride respectively, until saturated ammonium chloride dissolved grams1 7 DDBDDBC8.(1) 10 °C 〜20 °C(2)18. 5, 185. 59. D二A11. D12. B13.AD BC14.The pressure(3)1 〜4 BBCB5. 5. 5. 89. 8 meter, drip tube, beaker, glass rod(1)3, 76 oxygen(2)560, 11.27.3940 g31. 61 g / 100 grams of water9.26. 5%10.(1) 15 g(2) 20%The acid alkalinity of 3. 3 solutionAlkali acidThe PH test paper purple litmus reagent colorless phenolphthalein3〜10 B D A D A, B, C DCalcium oxide releases a large amount of hot, colorless phenolphthphthalein, which is alkaline(1)apple red(2)the samp(1)red flowers, roses, daisies(2)the greenThe potassium carbonate is alkaline b because the PH paper is directly dipped in the solution and the purple litmus iscontaminatedThis chapter test I〜5 DABBA6 〜10 ABACBII15 CACAA16.A,17.(1) A(2)the tl(3) C < < A18.solutionThe solute solvent Hydrochloric acid water iodinealcohol alcoholwaterSodium hydroxidewaterCalcium hydroxidewatercarbonatewaterCooling, solute and evaporative solubility of calcium hydroxide decreases with the increase of temperatureA man is a man of his ownCaO + H20 - Ca (OH) 2The temperature of summer is high, the water evaporates more, the salt solution of sodium chloride is changed less at high temperature, the salt of precipitation is moreIn the winter, the temperature is low, the water evaporates less, the pure alkali is in the low temperature the solubility changes big, the pure alkali that precipitates outSummer is high, low pressure,The oxygen dissolves and the fish surface as a result of insufficient oxygen24. A little25.(1) CH40(2)12. 5Fuel and its combustionBurning and extinguishing1 〜4 CBADExposure to air is great(1)isolating fuel from oxygen(2)the temperature drops below the f1ammab1e pointThe heat capacity is large enough to cool down. Water vapor insulates fuel from oxygenThe density is greater than the air, which insulates the fuel from the oxygen, and does not burnCoal and oil gasCoke tar in coke ovenPrevent fire from coming down and ignite the alcohol in the lamp holderPass the oxygen into the water4.2 carbon1 〜5 ACDCC6 〜10 DBBBC11. B12.materialThe nature of theuseIt is not very hot and not conductiveAs a shielding gasAt room temperature, the chemical properties are very lively Help burn hydrogenThe ignition density is less than the airThe balloonC + 02 light C02(1)remove air from the device to prevent explosion(2)the copper that prevents the formation of the formation is reoxidized(3)the carbon dioxide must be ignited2C0 + 02 igniting 2C02Clarify the level of fluid in the lime-water in the test tubeThe CaC03 high temperature CaO + C02(2) Ca (OH) 2(1)Cu CuO C02 CaC03(2) 2 cu + 02 heats 2CuOCuO + CO heats the Cu + C02 arrowC02 + Ca (OH) 2 ~ CaC03The laboratory process of 4. 3 carbon dioxide1 〜4 CCBCThe sink collects cylinders(1)CaC03 + 2HC1 一CaC12 + H20 + C02 arrow(2)the eqp generator(3)the upward exhaust method⑷C(1)spherical funnel spherical and semi-spherical vessel air catheter(2)the reactants are solids and liquids without heating(3)the reaction can be controlled and stopped4.4 chemical fuel1 〜6 CCDCDB7. 16 g/mo1, 3 mol, 3 * 6. 02 * 10 23 June 132 Carbon, hydrogen and oxygenCarbon and hydrogen gas(1)carbon monoxide nitric oxide(2)2C0 + 02 igniting 2C02(3)less cars and more busesThis chapter test1 〜5 DCDCD6 〜10 CDAAC(1)CO C02 S02 H2(2)graphite saltThe C02 is reforestationC + H20 heating CO arrow + H2 arrow14. A little(1)by burning copper oxide CO + CuO high temperature Cu + C02(2)the sodium hydroxide solution (1) conforming to the requirements of the rev generator(2) the reactants are readily available and the price is low(1)the requirements are too high(2)the reaction is too fast to collect(3)carbon dioxide is not pure(4)if the burning does not produce carbon monoxide18. (1) A(2)0. 04 0. 04(3) 4.24 69.71 percent(1)an iron stand tube with an alcohol lamp(2)black solid red 2CuO + C heating 2Cu + C02 arrow CuO(3)the purple litmus is red acid(4)the purple litmus turns into purple and H2CO3 heats H20 + C02 Slightly 20.(cute answer...)。