Chemistry Homework Help: Answers & Questions Page 58

• What is the oxidation number of carbon in the ion (Co3)2-?

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• How did Dalton Atomic Theory explain the law of definite proportions?

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• How does vapor pressure related to intermolecular forces?

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• How many grams of lithium nitrate will be needed to make 250 grams of lithium sulfate, assuming that you have an adequate amount of lead (IV) sulfate to do the reaction? Pb(SO4)2 + 4 LiNO3  Pb(NO3)4 + 2 Li2SO4

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• If ethanol has a density of .785 g/mL, what is the volume of 83.3 g of ethanol?

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• Lead(II) chromate, PbCrO4, is a yellow paint pigment (called chrome yellow) prepared by a precipitation reaction . In a preparation, 45.6 g of lead(II) chromate is obtained as a precipitate. How many moles of PbCrO4?

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• How to calculate the mass ratio of zinc to iodine in zinc iodide ?

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• What di you mean by hemolytic fission and heterolytic fission?

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• How can I calculate the percent composition of water in a hydrate?

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• When balancing a chemical equation, why can you change coefficients, but not subscripts?

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• How does heat capacity affect living organisms?

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• What is the chemical formula and molar mass for water?

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• Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas. How many grams of calcium hydride are needed to form 8.5 grams of hydrogen?

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• Your teacher has mixed salt, pepper, and water. What is a procedure that you could use to separate this mixture?

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• Combustion reactions always result in the formation of water. What other types of chemical reaction may result in the formation of water? What are some examples of these reactions?

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• In the polyatomic ion, CrO4 -2, what is the charge on the chromium atom?

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• Put mercury(II) oxide in a vacuum bottle and let it decompose at 500 °C. This equilibrium takes place: ##"2HgO(crystal)" ⇌ "2Hg(vapor)" + "O"_2("g")##. What is ##ΔG## for the reaction at 500 °C?

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• What is the formula of aluminum carbonate?

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• How do you convery cal to Joules? i.e. 444 cal to joules

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• What are the E and Z isomers of cinnamic acid?

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• A potassium ion has a charge of 1+. A sulfide ion has a charge of 2- .Wha tis the chemical formula for potassium sulfide?

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• What pressure (in torr) is exerted by 10.0 g of O2 in a 2.50 L container at a temperature of 27 degree C?

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• 1-liter 10x stock solution of SDS-running buffer is made. The 10x solution has 1%(w/v) concentration of SDS(MW288.8). What is the molarity of the SDS in 1x running buffer? the 10x stock is made at a concentration that is 10 times that of the concentration

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• What does the "C" in the specific heat formula represent?

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• How does your calculated empirical formula (Mg3O2) of magnesium oxide compare with the known formula of magnesium oxide?

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• How can transverse waves be produced on a rope?

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• Of 2-bromo-3-methylbutane , 2-chlorobutane , 2-chloro-2-methylpropane, which haloalkanes will give 3,4-dimethylhexane when treated with sodium metal (Wurtz reaction)? Write the reaction equation?

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• The atomic mass of oxygen is 16. How many neutrons does oxygen have in its nucleus?

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• Why is neutralization not a redox reaction?

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• How many moles of sodium hypobromite (NaBrO) must be added to a 2.00 L solution of 0.025 M hypobromous acid (HBrO) to form a buffer solution of pH 9.0 (Ka HBrO is 2.5x10-9)? Assume the volume of solution does not change on addition of NaBrO?

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• Which is a more favorable reaction: an endothermic or an exothermic reaction?

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• What is Charles' law formula?

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• What happened in Rutherford's gold foil experiment and what did he conclude?

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• What is the role of a catalyst in a chemical reaction?

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• What is the empirical and molecular formula for nicotine?

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• How can you tell the difference between sp3, sp2, and sp hybridization?

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• What is the steric number of the central atom in the following species ? a) Carbon dioxide, CO2 b) Ammonia, NH3 c) Ammonium ion d) Formaldehyde

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• Are acid-base reactions always double displacement?

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• A compound, ##XF_5##, is 42.81% fluorine by mass. What is the element ##X##? What is the molecular structure of ##XF_5##?

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• What is a formula that demonstrates the law of multiple proportions?

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• What is Iodine-126 isotope symbol ?

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• How is hydrogen bonding among water molecules related to the structure of the water molecule?

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• How do functional groups affect organic molecules?

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• What is mutual solubility temperature?

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• How to remove scientific notation in scientific calculator?

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• When pyrrole undergoes electrophilic aromatic substitution, at which position does substitution occur?

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• What is esterification?

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• What is the dipole moment of nitrogen trichloride?

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• Uranium, with an atomic mass number of 238 and an atomic number of 92, has how many protons?

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• How to write the electron configuration for sulfur? (z=16)

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