What is a chemical equation?
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Definitions of chemical equation on the Web:\n\nan equation that expresses a chemical reaction, the symbols on the left of the equation denoting the substances before, and those on the right those after, the reaction.\nwww.mercksource.com/pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_e_13zPzhtm\n\nA symbolic representation of the relationship between the reactants and products of a chemical reaction.\nxenon.che.ilstu.edu/genchemhelphomepage/glossary/c.html\n\nThe recipe that describes what you need to do to make a reaction take place.\nmisterguch.brinkster.net/vocabulary.html\n\nA short, easy way to show chemical reactions, using symbols instead of words.\njmsscienceweb.tripod.com/vocabulary.htm\n\na condensed statement that uses formulas to show the reactants and products in a chemical change.\nwblrd.sk.ca/~chem30_dev/appendix/glossary.htm\n\nIn chemistry, a chemical equation is a symbolic representation of a chemical reaction. For example, the combustion of methane in oxygen is \nen.wikipedia.org/wiki/Chemical_equation
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NaOH + NaH2PO4 ===> Na2HPO4 + H2O\n\nH2S + 2KOH ===> K2S + 2H2O\n\n(NH4)2SO4 + 2KOH ===> 2NH3 + K2SO4 + 2H2O\n\nSO2 + Ca(OH)2 ===> CaSO3 + H2O\n\nIn the above equation, further oxidation in air could occur by\n\n2CaSO3 + O2 ===> 2CaSO4
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Actually, all you need is:\n\n2 H2O2 ======> 2 H2O + O2\n\nif you have water on both sides of the equation, they "cancel" out.  Just like in algebra:\n\na + b = a + c  is the same as b = c
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Stoichiometry is the calculation of quantities (measure) of reactants in a chemistry equation.  You have x volumes of A added to y volumes of B gives z volumes of C plus u volumes of D . \nSo you have one algebraic linear equation  \nSupposing you have many chemical reactions happening simultaneously in a container, you would have many equations concerning the same quantities x,y,z,u . \nThat's when you use Matrix algebra to solve sets of simultaneous linear equations.
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d)  both a and c\n\nbecasue in a chemical reaction   everythin on the product and teh reactant must be the same\n\nthe mass and atoms must be same
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I not sure what style you learned to use to balance chemical equation but here is one way to do it. \nWe have four elements to balance (Al,H,Cl,O)\nLeave the compounds with aluminum with one of each. (Al done)\nThe simplest compound Al is AlCl3. To match the Cl on both sides put a 3 in front on HCl (Cl done)\nIf you add up the H (hydrogen) on the left side of the equation you'll see 6 of them. Add a 3 in front of the H20 to balance that. (H done)\nDo a quick check and you'll see there are 3 oxygen on each side (0 oxygen)\nAll the elements have been balanced, yielding a final equation of:\n3HCl + Al(OH)3 ---> 3H20 + AlCl3
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Chemistry is about two substances which could react and the resultant does not possess all or some the qualities of the initial substance thus forming a completely a new substance.  Therefore each substance that reacts is a special one, known as an 'element' having a characteristics of its own.  Diffrent elements react among themselves in chemical reaction.\nVR
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The balanced equation is\n\nH3PO4 + 3KOH ----> K3PO4 + 3H2O\n\nApart from using the rule to balance this, you can also view this in this way, H3PO4, when dissolved in solution, gives 3H+ and 1PO43-, while KOH when dissolved in solution gives 1K+ and 1OH-. OH- and H+ always neutralize each other to give water. Therefore, you need 3 OH- to neutralize the 3H+ from the acid. Work out the balance, you get the above equation.\n\nGenerally, number of atom and particles can be found by first finding the number of moles. Number of moles by definition is the mass of the substance divided by the molecular weight. For example, total number of mole in 12 g of C is \n12 / 12 = 1 mole\n\nWithin each mole, there are always a finite number of UNIT, which can be in the form of atom, molecule, or ion. This special number is called the Avogadro constant, and has a value of 6.02e23.\n\nFor example, 1 mole of C has 6.02e23 carbon atom.\n\nHowever, for 1 mole of H2, there are 6.02e23 H2 MOLECULE!!! because every two H atoms are bond together to form a more stable molecule. To find the total number of atom, you know each H2 molecule has 2 atom, so the total number of atom in this case is 2*6.02e23 or 12.04e23 atom.\n\nUsing the relationship\n\n# mole = mass/ molecular weight\n\nYou get mass = # mole * molecular weight
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First make a chemical equation, balance it, and find a mole ratio.  Use that ratio and the above information to solve the problem.
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You write each chemical in its ion form on both sides of the reaction.  Look in a table of solubilities to see if they are soluble or insoluble.  All soluble ions are crossed off and the remaining ions make up your net ionic equation.
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The reaction between sulfuric acid (H2SO4) and sodium hydroxide (NaOH) to form sodium sulfate (Na2SO4) and water can be written: NaOH + H2SO4 → H2O + Na2SO4. This is an incomplete equation, since the same number of atoms does not appear on both sides of the reaction (for example, 1 sodium atom appears in the reactants, but 2 sodium atoms appear in the products). Such a reaction could not actually occur. Correcting this fault is called balancing the equation. Placing a 2 in front of the NaOH balances the number of sodium atoms, as well as the hydrogen and oxygen atoms. The balanced equation is: 2NaOH(aq) + H2SO4 → 2H2O(l) + Na2SO4(aq); this equation implies that two molecules of NaOH are necessary to react with each molecule of H2SO4. An equation must be balanced before a chemist can make calculations based on it.
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H2S---> 2 H^+ + S^2-\nK(eq) = \n[2H^+]^2 [S^2-]\n ---------------\n     [H2S]\n\nNH4+----> NH3  + H^+\nK(eq) =\n [H^+][NH3]\n       ------------\n         [NH4+]\n\nC6H5COOH----> C6H5COO-  + H+\n\nK(eq) = \n[H^+][C6H5COO-]\n        ---------------\n         [C6H5COOH]
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I think one equation that you should know is moles=mass/mr\n\nThis will make it easy to work out problems of this nature by just rearranging the equation.\n\n15 grams is the mass, find the mr of oxygen from the periodic table and that should get you to the right answer.\n\nHope that helps.
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What do you want a step by step set of instructions or a balanced equation?\n\n2C6H5OH + NaOCL = 2C6H50 + NaCl + H2O
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Write the equation for K.  You know K, [NO2}, so solve for the only variable you don't know [N2O4].  By the way, these are gasses so it is not a solubility product.  That involves a solid.
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do you want to know how to balance chemical equations? It's actually quite simple when you know how\n\nrather than asking for direct answers, it's better if you know how to do it for yourself\n\nI'm not going to answer your questions but show you how to do it for future reference\n\nH2 + O2-->H2O\n\nthe above equation is not balanced because there is only one oxygen atom on the right and two on the left\n\nnow, how do we balance this?\n\nfirst thing we need to do is ensure that there are equal amounts of atoms on the left and on the right\n\nso, to balance that equation\n\nwe will write\n\n2H2+O2-->2H2O\n\nthe equation is now balanced with respect to equal atoms on the left and right\n\nin words\n\n2  molecules of hydrogen  react with 2 oxygen atoms to produce 2 molecules of water\n\nthere are now 4 hydrogen atoms and two oxygen atoms on each side of the equation\n\nthe 2 in front of each compound represents the molecules and the subscripts represent the number of atoms
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A balanced equation is one where the number of atoms of each element are the same on both sides of the equation. This means it will follow the Law of Conservation of Mass.