Answers created by anor277

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• How does ionization energy increase?
  
• Can I assume the concentration of the H3O+ is the concentration of the strong acid( in this case sulphuric) on a mixture of oxalic acid(weak acid) and Sulphuric (Strong acid)?
  
• What the symbol for the ion with 19 protons and 18 electrons?
  
• Which gases will effuse the most rapidly?
  
• The value of kc for H2+CO2=H2O+ CO is 1.88 AT 1000c if 1 mole of H2 and cO2 are placed in 1LITER FLASK. The final equilibrium concentration of CO at 1000c is?
  
• Why are metalloids located on the periodic table?
  
• What is air a mixture of?
  
• The following equilibrium concentration exists when Agbr is in solution AgBr=Ag +Br , Ksp =7. 7*10-13 , calculate solubility of AgBr in g/l in a solution of 0. 0010M NaBr?
  
• Name the chemicals that break down the smell and yellow color of urine?
  
• How do you calculate the percent composition of chromium in #BaCrO_4#?
  
• How can a chemical equation be made more informative?
  
• How many molecules are in 3.0 moles of carbon dioxide?
  
• What is science notation?
  
• Standard heat of formation is not zero for.. a) Na b) Cl2 c) Hg d) Br2 Please explain.?
  
• Why is NaOH a Lewis base?
  
• Find mass when density of first liquid is 1.44g/cm3 and density of second liquid is 1.48g/cm3 and both having a volume of 25cm3?
  
• How many grams of #NaClO# are produced when 80.0 grams of #O_2# are produced?
  
• What is the normality of 2M solution of phosphoric acid of an acid base titration?
  
• The ionozation energy of hydrogen atom is 13.6ev the 2 ionization energy for helium is?
  
• A reaction in which A+2B converted into C.then 5 moles of A and 8 moles of B will produce how many moles of c?
  
• What are the 5 different types of chemistry? What does each specialize in?
  
• Where do the following belong on the pH scale?*
  
• How do you convert 100 cm to meters?
  
• Why are changes of state considered to be physical?
  
• A compound is found to contain 21.95 % sulfur and 78.03 % fluorine by mass. To answer the question, enter the elements in the order presented above. QUESTION 1: The empirical formula for this compound is?
  
• Bicarbonate Ion: Acid or Base?
  
• Does SrS give a precipitate with saturated srcl2?
  
• What is the pKa of buffer solution #HC_2H_3O_2# when HCl is added?
  
• How do you calculate the boiling point of a solution?
  
• What type of intermolecular force of attraction is found in #CO_2#?
  
• Where are chemicals found?
  
• Of the following elements, which has the highest electronegativity ? A) Sc B) P C) S D) As
  
• A certain gas has a volume of 500.0 mL at 77.0C and 600.0 torr. Calculate the temperature, C, if the volume decreased to 400.0 mL an the pressure is increased to 1.00 atm.? (81.9 C)
  
• Blast furnaces give off many unpleasant and unhealthy gases.If the total air pressure is 0.99atm,the partial pressure of carbon dioxide is 0.05atm,and the partial pressure of hydrogen sulfide is 0.02atm,what is the partial pressure of the remaining air?
  
• A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressures of the three gases in the tank are 35 atm of O2, 5 atm of N2, and 25 atm of He, what is the total pressure inside of the tank?
  
• When does a chemical reaction reach equilibrium?
  
• Question 3(Multiple Choice Worth 2 points) What type of organic compound contains the following functional group? A carbonyl group, which is an oxygen atom double-bonded to a carbon atom, bonded between two different carbon atoms. Ketone Ester Alde
  
• A student calculated there to be 0.002395 mol Cu2+ ions in one 25.00 mL titration sample. Calculate how many moles of Cu2+ ions were present in the 250.0 mL volumetric flask before the three 25.00 mL samples were removed?
  
• Determine the formula of A. Molarity B. Molality C. Mole fraction D. Normality ?
  
• For the first 6 member in the series of Alkenes plot the Number of carbon atoms on one axis and the Number of hydrogen atom on the other axis use this graph to derive the formula of the alkenes that has 10 carbon atoms?
  
• How to calculate molarity of #Fe^(3+)#? #(Cr_2O_7)^(2-) + Fe^(2+) = Cr^(3+) + Fe^(3+)#
  
• What main steps should be carried out to prepare 250 mL of 0.25 #mol L^(-1)# lead (II) nitrate, #Pb(NO_3)_2# solution?
  
• What is a large molecule created by polymerization of monomers?
  
• Which has a more pronounced ionic character FeCl2 or FeCl3? Fe+6 is ionic or has a more pronounced covalent character?
  
• A rigid plastic container holds 1.00 L methane gas at 650 torr pressure when the temperature is 20.9°C. How much more pressure will the gas exert if the temperature is raised to 44.1°C?
  
• How can you find the vapor pressure of a liquid?
  
• Why is the first ionization energy of aluminum lower than the first ionization of magnesium?
  
• What happens in a combustion reaction?
  
• What volume will 500 mL of gas at 20°C and a pressure of 420 mm Hg occupy if the temperature is reduced to -80°C and the pressure is increased to 650 mm Hg?
  
• How many grams of NaCl required to completely neutralize 100ml of 1M of H2SO4?
  
• How many electrons would it take to equal the mass of a helium nucleus?
  
• Second ionization enthalpy of O is O+ or O+2??
  
• Why is benzene insoluble in water?
  
• Why the given compound is non-aromatic?
  
• You need to separate water from salt in a saltwater mixture. Why would it not work to filter the mixture?
  
• How did Rutherford's gold foil experiment change the model of the atom?
  
• How does electronegativity change across a period?
  
• Which of them is conserved in nuclear rxn? only mass, only energy,only charge,none?
  
• What is the mass of a sample of neon gas if the volume is 10 L at STP?
  
• If #50.0# milliliters of 3.0 M #"H"_3"PO"_4# completely neutralized #150.0# milliliters of #"Mg"("OH")_2#, what was the molarity of the #"Mg"("OH")_2# solution?
  
• Why following compound is anti-aromatic?
  
• Why do ionic radius increase?
  
• How do you convert mass to density?
  
• Mo2nd acetate is paramagnetic why?
  
• Based on the octet rule, iodine most likely forms what kind of an ion?
  
• How do the states of matter relate to the water cycle?
  
• What is the oxidation no. of Cl in FeCl3.H20?
  
• Why are alcohols not considered acids?
  
• Is heat being added or taken away when water boils?
  
• What metals are a collection of seventeen chemical elements in the periodic table, specifically the fifteen lanthanoids, plus scandium and yttrium?
  
• What do catalysts, like enzymes, do to chemical reactions?
  
• Tell how you would prepare a 500.0mL of 0.50 M ammonium carbonate solution? Include all necessary equipment and amount of chemical (in grams).
  
• What are ionic compounds?
  
• How are alkenes named?
  
• What is an oxidation number?
  
• A sample of nitrogen gas was transferred to a 100 mL container at 100 kPa and 75.0 C. What was the original temperature of the gas if it occupied 125 mL and exerted a pressure of 125 kPa?
  
• What are the characteristics/properties of the noble gases?
  
• What is the charge on the cation (#Fe#) if the formula of an ionic compound is #FeS_2#?
  
• Why do I sometimes see #CH4#, instead of #CH_4# ?
  
• Why are all molecular compounds composed of atoms of two or more different elements?
  
• If #Na_2S# is added to a solution containing #AgCl#, a black precipitate of #Ag_2S# forms. Why does this happen using Le Chateliers's principle?
  
• Synthetic diamonds can be manufactured at pressures of #6.00 times 10^4# atm. If we took 2.00 liters of gas at 1.00 atm and compressed it to a pressure #6.00 times 10^4# atm, what would the volume of that gas be?
  
• Why are some molecules tetrahedral?
  
• Why is the mass number an integer but the relative atomic mass is not?
  
• What does an element's atomic number represent?
  
• How does solubility change with polarity?
  
• What balanced equation represents a chemical change?
  
• A gas tank holds 3625L of butane at 850mmHg. What is the volume of the butane at 25°C?
  
• What is the oxidation number for #"S"_8"#?
  
• What is an element that often combines with metals to form important ore minerals near hydrothermal vents?
  
• Are the forces that hod together the nucleus of an atom more than 1 million times stronger than the chemical bonds between the atoms?
  
• What is the ionic compound name for al2o3?
  
• Does sodium bicarbonate make a gas?
  
• How much energy is involved in the reaction of 1.34g of Ca(OH)2?
  
• How is an endothermic reaction identified in an equation?
  
• A solution of formic acid has a pH of 2.70, calculate the initial concentration of formic acid?
  
• What is the volume occupied by 25.2 g of #CO_2# at .84 atm and 25°C?
  
• How many moles of Co2 are produced when 5.95 mles of ethane are burned in excess of oxygen withthe following: 2C2H6+7O2 --> 4CO2+6H2O?
  
• What is the heterocyclic amine in ritalin?
  
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