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| Simple Easy Chemistry QuestionBonding Valence electrons10 POINTS |
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Posted by: vickync4 - 01-16-2020, 09:21 AM - Forum: aluminium faq
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The elements in group 14 have 4 valence electrons, does this mean they gain or lose electrons when they bond? do they bond with same elements within the group?please leave examples thanks! 10 POINTS UP FOR GRABSthey can gain or lose electrons butthose rules are rules of thumbIn reality, whether an electron is gained or lost and what type of bond is formed depends on the differences in electronegatvities between the atoms involved examplesCH4C has EN 2.55, H 2.20since the difference is 0.5, the bond is considered non polar covalent and the electrons are shared almost equally rather than transfered from C to H or from H to C CF4F has EN 3.98diff in EN between C and F 1.43So the bonds are polar covalent with the Fluorine taking most of the valence electron density from the C(ieC gives up 4 electrons) CaC2calcium carbideCa has EN 1.00difference in EN between Ca and C 1.55this is an ionic bondthe two C\'s withdraws almost all of the valence electron density from the Ca(ieC gains 4 electrons) and this goes for basically all the columns of the periodic table column 1 usually gives up an electronbut not alwayscolumn 2 usually gives up a 2 electronsbut not alwayscolumn 13 usually gives up 3 electronsbut not alwaysetcexampleAlH3aluminum hydride the EN of H is 2.20EN of Al is 1.61so the H withdraws electron density from the Al and forms an H- ionthis is called a hydrideAn element in column 1 gained an electron.Other related question
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| Why do metals of different particle sizes have different melting point |
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Posted by: Ericapracy - 01-16-2020, 09:21 AM - Forum: aluminium faq
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Why do metals of different particle sizes have different melting point?They don\'t reallySmaller particles heat faster than large ones This is because they have more surface area per pound Wad up a sheet of aluminum foil and stick it in the ovenIt will take a fair amount of time to get hotDo the same thing with a sheet of foil, and it heats almost instantlyWorks the same for cooling.Other related question
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| how can i stop my cat from scratching at the door |
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Posted by: cjmxmCausy - 01-16-2020, 09:21 AM - Forum: aluminium faq
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We got our cat when I was 6 months pregnant, and she\'s slept with usNow we have a 3 week old son who she thinks is a toy.and I don\'t want to risk her pawing at him or sleeping on him when I\'m sleeping.So when no one can watch her we put her out in the porch, its where her food water and litter box areBut she always scratches to get in! She does it loudly and it sounds like nails on a chalkboardThe porch isn\'t heated and on cool nights I let her inside, with the door open just enough for her to get inIf i close my bedroom door she scratches that tooI\'ve tried to just ignore her, and hope she\'ll go lie down but no luckI know the baby is new to her and she doesn\'t understand why she can\'t come sleep with us anymore and I feel very sad for her.She\'s not allowed in the Babys room at all, and will often ignore it even of the door is open.but the baby sleeps on a bassinet next to our bed.Tips?.suggestions.?They hate aluminum foilYou could try laying a couple of sheets on the floor outside of the doorShe won\'t want to stand on top of it to scratch at the door.Other related question
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| Stove eye burnershow do you clean them |
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Posted by: RubiaUt - 01-16-2020, 09:21 AM - Forum: aluminium faq
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How do you clean stove eye burners (the silver things under the stove eyes)? I have tried everything but can never return them to their silver state.any suggestions? Thanks and Happy New Year!they never come as clean as when you bought them i always used my oven cleaner sprayed them with that.when they get to bad and do not come clean anymore i go to the dollar store and buy four more and that helps about once a year.4 for a dollar can\'t beat the price.Other related question
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| CPU packaging for shipping |
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Posted by: PattiObrya - 01-16-2020, 09:21 AM - Forum: aluminium faq
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I need to send my cpu to someone by courierThe problem is I dont have the small plastic cover in which the cpu is placed when bought newI do have the outer box thoughAll i want to know is how and in what should I pack my cpu urgently and preferably in simple easily available stuff ? ThanksAny bright ideas?Can I pack it in ordinary plastic bags filled with cotton to cushion it or is static going to be a problem ?This is a CPU with no pins, correct? It has flat metal spots on the bottom - lands? If so, you can simply wrap it in an anti-static bag and then wrap it in bubble sheet or provide other similar physical protectionIf it has pins, find a piece of foam and cut it to the size of the CPUWrap the foam in a layer of aluminum foil and then press the pins through the aluminum foil into the foamThen wrap in an anti-static bagYou don\'t want the CPU to be able to move at all in the packagingHard packaging works better than soft packaging.Other related question
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| How much of Al that reacts w73g of Hydrogen Chloride to produce aluminum Chlorid |
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Posted by: CharlesBor - 01-16-2020, 09:21 AM - Forum: aluminium faq
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in gramsThis is just what we covered in chemistry class-so let me see how to solve thisFor any stoichiometry problem it\'s imperative we have a balanced equation to work withWhat do we know? We know Al reacts with HCl to yield AlCl3 (remember aluminum loses three electrons, always, to form a cation, so we must have 3 atoms of chlorine for one atom of aluminumAnd they tell us that H2 is producedSo so far we have: Al + HCl → AlCl3 + H2 Now to balancing this equationNever start balancing with hydrogen or oxygenSo we look at Al, and there is 1 mol of aluminum in both the reactants ® and products (P)So it\'s balancedBut Cl isn\'t, right? What if we change the coefficient of AlCl3 to two, and have 2 mols of Cl3 in the products (236 Cl total)Then, change the coefficient of HCl in the R to 6 as well, and balance Al in the R to reflect that (2 Al) and, finally, H2 to reflect that (326) 2Al + 6HCl → 2AlCl3 + 3H2 Now you\'re ready to begin your calculations! Let\'s convert grams of HCl to mols, so we can use the mole ratios from our balanced chemical equation (BCE)We take our molar masses from the periodic table to two decimal placesSo 1 H(1.01 g/mol H) + 1 Cl(35.45 g/mol Cl) equals 36.46 g/mol HClNow we can begin dimensional analysisBegin with the information we\'re given-73 g AlMultiply it by 1 mol HCl over 36.46 g HCl (the molar mass we calculated), so we can cross out grams HClThen relate it to 2 mol Al over 6 mol HCl (from our BCE) so mols HCl can cancelNow we\'re left with mols Al and one more step is needed-get to grams AlRelate 1 mol of Al to its mass we get straight from the periodic table-26.98 g AlCross out mols Al and it\'s all down to simple arithmetic! I got 18 grams Al, rounded to 2 sig figs.Other related question
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| Element compound heterogeneous mixture or solution |
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Posted by: Lindajet - 01-16-2020, 09:11 AM - Forum: aluminium faq
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Indicate which of the following is an element, compound, heterogeneous mixture, or solution:aocean water bcalciumcvitamin Cddry iceegrain alcoholfafter-shaveghamburgerhaluminum foilimilkjiron nailThis is not a good start to your chemistry class if you are stuck with the easy questionsHow about reading the chapter?Other related question
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| Metal or plastic that is very flexiblebendable |
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Posted by: flebtwefe - 01-16-2020, 09:11 AM - Forum: aluminium faq
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You know those things like tents that are folded up really small in a case then you take it out and it instantly pops up into shape?? Well I need to make something that will instantly pop open into shape and that I can collapse really small when not in useBut I don\'t know what the name of that flexible metal/plastic stuff is called or where to get itAny help would be great thank you so much!!This is not any one material, but a construction and assembly of different products The main part is fabric, just as in tentsThe choice of fabric has more to do with its durability and weather resistance, and has little or nothing to do with the shape-poppingThe popping into shape is usually caused by fiberglass ( or sometimes in smaller objects, spring-steel) rods that slide into a sleeve, sewn into the perimeter of the fabric.The rods have a tension on them, and can be compressed in one direction, then released in anotherThe fabric never lets them expand to their fullest, which keeps tension on the shapeLead will never pop into shapeIt is the metal with the least amount of spring, and aluminum is not far behind.Other related question
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Hope this helpsOther related question