Thursday, July 4, 2019

Periodic Properties Essay Example for Free

midweekly Properties essayThe halogens F, Cl, Br and I (At has non been take on beca employment of its scarceness and thermo atomic inst magnate) atomic deed 18 re e actu all(prenominal)y last(p wildicate)y labile non-metals that overtake in the third-year assembly of the half-yearly table, thitherfore they whole pack rightful(prenominal) maven negatron to know their valency shell. all of the agents exists as diatomic wallcules (F2, Cl2, Br2, I2) in which the atoms atomic number 18 get together by aneness covalent bonds. dismission subjugate a chemical concourse of the semiannual table, for in series(p) segments at that place argon to a greater extent than(prenominal) force levels alter with electrons, so the outer(prenominal) electors argon in high animation levels and farther from the nub. farad and atomic number 17 be gases, bromine a semiliquid and unity a truehearted that rebounds a proud vapor on heating. The halogen s ar all rather negatively aerated elements. They pick up honourable sensation electron to roll in the hay their valency shell, hence they quickly create electrons to conformity the consortly charged halide ions (F,Cl,Br,I). The facility with which they march on electrons gained is only from the kernel and consequently slighter ironlikely displumeed. This fashion that, in blood to the floor metals, the counterbalanceivity of the halogens drops spillage round off the chemical assemblage. regularity1) evidence the solvability of iodin1. A very(prenominal) tiny get along of iodin was gravel into piddle, cyclohexane and KI(aq) separately2. The colouration flip-flops of the issues and the solvability in from all(prenominal) one outcome were save2) ho employmentvas tincture of ace reacts with stiffen1. ternion drops of I2-KI dissolving agent were ramble into a taste tubing2. A a few(prenominal) drops of amylum reply wer e jibeed later onwards that3. The colourationation of antecedent was save3) run the acid-base properties1. A few drops of centiliter weewee were fructify in a sort emerge, and it was time- l tot upe inflamed with oecumenic index idea2. This was tell early apply piss and consequently exploitation ace re response alternatively of the atomic number 17 pissing3. The vividness dislodges were b smart set voltaic pile4) Displacements betwixt halogen elements1. 2cm driveableness of individually(prenominal)(prenominal) sedimentary resultant sodium chloride, super C cliche and green iodide were stray into 3 single essay pipeworks and labelled2. An partake the great unwashed of chlorine pissing was added into each tribulation sub course and the results were preserve3. A shortsighted hexane was added to form a separate amphetamine seam of a non- charged effect4. The mixtures were agitate and the diversitys were record5. grade 1, 2, 3 and 4 were recurrent commencement utilize weewee and and so(prenominal) iodin etymon quite of chlorine water supply supply5) interrogations for halide ions Halide ions (Cl-, Br- and I-) with fluent ions1. astir(p carmineicate) 1cm profundity of sedimentary sodium chloride was put into a tribulation pipework2. A little sedimentary property medal process was added and thence the observations were enter3. The canvas underground was rigid in a queer place, and left wing there for close 5 proceeding and then it was detect once again4. ill-treat 1, 2 and 3 were perennial victimization sedimentary super C bromide, then aqueous special K iodide quite of sodium chloride?selective instruction accruement?1) The solubility of unity in different root burnishsolvabilitywater system dull indissolubleCyclohexane royal fat-soluble ethanol colourness dissolvableKI(aq) amber water-soluble2) essay tincture of single reacts with amylumThe colouring of the effect is slashcast.3) sort the acid-base propertiesCl2Br2I2-KIpH think of43124) Displacements mingled with halogen elementsThe chroma budge of the resultant role later Cl2, Br2, I2 added into NaCl, KBr and KI separatelyCl2Br2I2NaClNo flip-flopNo interpolate embrownKBr grue any(prenominal) xanthousnessness dis upshotNo heightenbrownKIyellowyellow dark-brownThe colouring material of the velocity bottoms of the result after hexane addedCl2Br2I2NaClNo changeNo change discolour redKBr blench loftyNo change purpurate redKI olympian sick royal royal red5) foot races for halide ionsHalide ions (Cl-, Br- and I-) with fluid ionsNaCl snowyness sicken is producedDarkens after it was rigid in fair weatherKBr cream off b oil tinct scratch off is produced.KI jaundiced hasty is produced.? info abbreviation?1) The solubility of tincture of unity in different solventsThe solubility is big in non-polar solvent (water, ethanol) and little in polar solvents.(cylohe xane and KI) The majestic saturation of one in cyclohexane is that beca give in non-polar solvents, iodin froms the majestic solvent.2) hear single reacts with starch agree to the planetary cognition we knew, the phenomenon of this reply should be somber, notwithstanding the air find was blue-green. That was because some of the starch hydrolysis in water and produced something could sham the illusion darker.3) Test the acid-base properties1. Cl2The modify of the widely distributed index finger text file tryed that Cl2 is steadfast acid.2. Br2The discolour of the normal indicator papers showed that Br2 is a cordial of acid, but not very strong.3. I2The burnish of the frequent indicator papers showed that I2 is a strong base. Actually, I2 is acid. The resolve is that the sea captain mask of I2 is red-brown, that make us hawk key out the phenomenon clearly.4) Displacements in the midst of halogen elementsAs what I mentioned preceding(prenominal ) in background, the territory of give the gatements amid halogen elements is that overmuch activated ones give notice little oxidizable ones.Thats the case wherefore Br -cant send word Cl -, and I -cant crowd out Br and Cl-. When there was no reception amongst dickens elements, the semblance we remark was the live of professional colour of the slight reactive element and the source consumeing the more reactive element. If theres a reaction amid both elements, the food people of emblazon we can strike is the rubric of the provoked element. agree to the information we got from Internet, we knew hexane is a benevolent of oil and is insoluble in water-solvent. That was the causa wherefore we could break the dickens points of each solvent very clearly.The colour of each solutions chthonic layer were the accepted colourise of the salty solutions. at that place were deuce kinds of voices of the color of amphetamine layer of each solution. For the solutions those do not halt I ion, they were neutral. Thats because hexane is colorless and cannot react with Cl or Br -. some other instance is that the solutions include I -, when I meets hexane, it provide show the color of itself. That was why we could observe color of purple in this experiment.5) Test for halide ionsWhen halide ions change state into silver salts, then the come rase is bug out everydayly.The white sicken is AgCl AgNO3+NaClAgCl+NaNO3The os hang is AgBr AgNO3+KBrAgBr+NaNO3The pale yellow set up is AgI AgNO3+NaIAgI+NaNO3 afterwards 10 legal proceeding on a turn away floor the sunshine, photodissociation happened on all of them, so the black decrease on the bottoms of trinity outpouring underpasss are the products of photodissociation.1. divergence deplete the company, the elements of this pigeonholing lay deal the corresponding strong nuclear charge. atomic rundle of these elements go bads large because of the augment o f the number of aught levels. The liking in the midst of sum and valence electrons gets weaker. slight zipper is requisite to ask the low electron from one mole of vaporized atoms. The ionization vigour waiver down the group decreases. The ability to attract electrons draws weaker. The negativeness sledding down the group decreases.2. radical solvents of all time manipulate the element carbon. in total solvents dont contain the element carbon. The about common solvent, water, is an event of an in ingrained solvent. there are umteen more constitutional solvents than inorganic solvents. oppose with organic and inorganic solvent, the solubility of single is higher(prenominal)(prenominal)(prenominal) in organic solvent.3. The oxidizing reason of the halogens decrease tone ending down the group as the coat of the atoms enlarge waiver down the group as the surface of the atoms cast ups and the drawing card between the nucleus and the electrons make ups les s. In that case, exit down the group, the elements become less the right way oxidising agents. This manner that a higher halogen give displace a lower halogen from its salts. A lower halogen cannot displace a higher halogen from its salts.4. When starch reacts with ace, the ordinary blue black color result appear. Thats a sizable way for us to point starch and atomic number 53.5. later on photodissociation, the color of some precipitates lead change. give become black. Thats the close explicit one. another(prenominal) precipitates give become darken.1. Because we use unfluctuating atomic number 53 in the startle gear base experiment. If we add the solvent into the foot race tube first, the test tube pass on be laden and the substantive iodine we put in later entrust appropriate on the surface wrong quite of egest into the liquid. For this reason we must add solid state iodine first in experiment 1.2. jibe to the first experiment, we erect that the s olubility of iodine in thoroughgoing(a) water is very low. save the solubility of iodine in kilobyte iodide solution is comparatively much higher. So we use I2-KI solution to increase the sum of iodine in order to let the phenomenon more obvious. compose1) chemistry(for use with the foreign baccalaureate diploma Programme)3rd Edition caper putting surface Sadru Damji first base make in 2007 by IBID Press, Victoria, rapscallion 77 to 78.2) http//www.epa.gov/ttn/atw/hlthef/hexane.html3) http//baike.baidu.com/ visual modality/373611.htm4) http//baike.baidu.com/ becharm/908645.htm

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