Chemistry Homework Help: Answers & Questions Page 79

• How does matter change from solid to liquid?

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• What is the empirical formula of cellulose?

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• What is the ionic compound for Ca3(PO4)2?

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• The charge of the metal in the compound MgSO4 is?

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• How much does 1 gallon of water weigh in lbs? Given Density of water 1 g/cm

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• What is the difference between an intrinsic and extrinsic semi conductor material? What is doping?

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• What element has the symbol Rn?

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• What is the relationship between D-glucose and D-fructose?

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• What is the formula for the conjugate of H2C2O4?

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• How many dependent variables should be in an experiment?

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• A sample of steel with a density of 7.81 g/ml is added to a 100-mL graduated cylinder with 45.0mL of water. If the resulting water level is 55.5 mL, what is the mass of the sample of steel?

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• What's the difference between a formula unit and a molecule?

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• How do I find the number of grams in 1 mole of sulfuric acid. Then calculate the number of grams of sulfuric acid needed to make a 1-L solution of sulfuric acid in water that has a molarity of 3?

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• The chemical formula for carbon tetrachloride ##C####Cl_4## has how many chlorine atoms?

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• What is the mole ratio of nitrogen to hydrogen in N2H4?

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• What is entropy of a system?

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• What would be the empirical formula of ethane?

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• What is the difference between a limiting reactant and an excess reactant?

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• What is the difference between polar and non-polar covalent bonds?

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• Why is hydrogen included in the metal activity series?

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• Which substance in each pair of liquids would you expect to be less volatile? Why? butane or water, NH3 or NH2OH, CH3OH or CH4

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• In the metric system, what is the base unit for length?

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• Write the balanced equation for the reation of iron (III) phosphate with sodium sulfate to make iron (III) sulfate and sodium phosphate?

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• How many liters of a 3.0 M H3PO4 solution are required to react with 4.5 g of zinc? __ H3PO4 + __ Zn _x0001_ __ Zn3(PO4)2 + __ H2

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• Given the mass of an electron is (1/1836) amu, what percentage of the mass of a carbon-12 atom is contributed by its electrons?

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• What is the hybridization of P in ##PF_3## and ##PF_5##?

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• How do periodic trends affect bonding?

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• Balance chemical equation to show how to convert: a.zinc carbonate to pure sample of zinc sulphate b.calcium oxide to a pure sample of calcium carbonate ?

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• What is the molecular weight of sulfur if 35.5 grams of sulfur dissolve in 100.0 grams of CS2 to produce a solution that has a boiling point of 49.48°C?

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• What is the position of oxygen in the periodic table?

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• How does chemical potential energy change during endothermic reaction?

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• What is the name of the alkane having five carbons?

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• Quest (1) determine the ksp for magnesium hydroxide Mg(OH)2 where the molar solubility of Mg(OH)2 is 1.4X10^-4 M? quest (2) the Ksp for Zn(OH)2 is 5.0x10^-17 .determine the molar solubility of Zn(OH)2 in a buffer solution with a pH of 11.5?

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• What is the VSEPR shape of the molecule H2O?

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• What is the difference between nucleophilic substitution and electrophilic addition?

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• How many constitutional isomers are possible for C4H9Br?

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• Who invented the periodic table?

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• What is the Zaitsev's rule?

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• How would you convert 3598 grams into pounds?

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• What units are used to measure gas pressure?

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• What is your actual yield of uranium hexabromide if you start with 100 grams of uranium and get a percent yield of 83% ? U + 3 Br2 → UBr6

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• Is formation of acid rain an physical change?

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• Is molecular mass and molar mass the same?

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• How does the law of conservation of mass apply to physical changes?

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• How do polar bonds contribute to the polarity of a molecule?

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• Why is the boiling point of iron higher than magnesium ?

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• Why is air over New York City considered as a heterogeneous mixture? Why is not considered as a homogeneous one?

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• How would you write the formula for sodium perchlorate?

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• Why is FeCl3 a Lewis acid?

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• What is the empirical formula of H2O2?

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