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3. In atoms, electron count = proton count, so 9 electrons ~> 9 protons. The element with 9 protons is Fluorine. 4. Carbon-14 is an isotope of carbon with 6 protons and 8 neutrons. 10. Being a gas and not conducting electricity says it's a nonmetal. Elements with 1, 2, or 3 valence electrons are all metals. 6 valence electrons is the only nonmetal. 11. Iodine is in column 7A, which gives it 7 valence electrons. According to the Octet Rule, elements want 8 valence electrons, which means Iodine wants to gain one electron. Electrons have a negative charge, so iodine would want a 1- charge.
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Either method II or method III would work in theory. However, an electronic balance is not usually designed for weighing things the size of rocks. So the correct answer is II.
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Adding silver nitrate to sodium chloride yields/makes ... (what color is the AgCl precipitate/solid?) (AgNO3 + NaCl --> NaNO3 + AgCl) --------------------------------------... For a question like: How could you distinguish solid barium chloride from solid barium sulfate? what should should I make them react with? (so that the results are noticeably different?) BaCl2 + ? --> BaSO4 + ? --> (Should i use AgNO3? what would the precipitate's color(s?) be?) ---------------------------------- what is Sodium benzoate 's formula? Thanks in advance for answering!
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This is a tricky one. I guess what they mean by a "pure" compound is any compound containing only one kind of molecule. Also note that a compound is a substance containing two or more different types of atoms (this means elements are not compounds). Sodium is not a pure compound because it contains only sodium atoms. Sugar is a pure compound, because it contains only sugar molecules, which contain C, H and O. Oxygen is not a pure compound because it, like sodium, is an element and only contains one kind of atom. Air is not a pure compound because it contains several different kinds of gases, each with its own kind of molecule. Finally, iron is not a pure compound because it is an element. From this analysis, we can conclude that the answer is: a. 1 Next time, post this question under the Chemistry section. Yahoo! Answers sometimes has no clue where to put these questions, and you must set it manually. The people in the Chemistry section will be much more knowledgeable and helpful with this stuff (I'm an AP Chemistry student, and I use their help occasionally). Hope I helped!
Chemistry question! Please help!!!!?
1) 200x 70/100= 140 lbs 1lbs = 0.4536 kg = 453.6 g 140 x 453.6 = 63500 g water H2O = 18 g/mol H2O = 6,02 x 10²³ molecules in 1 mol H2O = 63500 x 6,02 x 10²³ /18 = 21237.2222 x 10²³ molecules water 2)A compound is defined as the chemical combination of two or more elements. A chemical bond is the "glue" that holds atoms of different elements together. Bonds can generally be classified into two general types: ionic and covalent. Ionic bonds generally occur between a metallic atom and a nonmetallic atom. The ionic bond involves the transfer of electron from the metallic atom to the nonmetallic atom, resulting in ions (positively and negatively charged). The positively charged metal ion is attracted to the negatively charged nonmetal ion. Covalent bonding involves the sharing of electron and generally occurs between atoms that are nonmetallic. Properties such as melting point, boiling point, solubility, electrical conductivity, color and odor can help you distinguish ionic from covalent compounds. In this experiment, you will observe several properties of some ionic and covalent compounds and attempt to recognize some patters among the properties. It is important that you understand that the patters are generalizations that do not necessarily apply to all ionic and covalent compounds. http://www.weironline.net/chemcentral/labs/ionic-covalent.html
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1. The ideal condition for gas is that the gas molecules do not interact with the surrounding or each other, and the volumes of molecules are negligible. Under low P and high T, the interactions will be minimized, and under low moles, the molecules occupy negligible volume. 2. Don't have time to show you the whole procedure, but i think this is enough to get you started. Just use ideal gas law, PV=nRT, and since the conditions are all the same (Ie P and T are the same for all), you only need to worry about the volume/mole ratio. You are given the volumes of the reactants, all you need to do is figure out the molar ratios between each component of the chemical reaction to figure out the answers. 3. Again, use PV=nRT. Set up the equation P1V1/T1 = P2V2/T2 with 1 being the experimental condition (ie 22 celcius and 753 torr, and don't forget to convert to standard units) and 2 being the STP condition. V2 would be the answer you are looking for. 4. I believe the rate effusion are inversely related to molecular weight. Hope this helps, Mr/Ms 6-year old. :)
Tricky chemistry question please help?
a. 31 You take the fact that bromine or Br has 7 valence electrons and oxygen or O has 6 each so multiply 6 by 4 and add the 7 to get 31. Hope it helps
Chemistry question: Please HeLp!! :) Thanks?
A student prepares a salt solution by dissolving 85.638 g of NaCl in enough water to form 237 cm3 of solution. Calculate the number of grams per cubic centimeter of solution