Answers created by zhirou

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• What is a heterogeneous reaction?
  
• Who's interested in a new Socratic on a different website?
  
• Magnesium chloride has an atomic mass of 94 amu. What is the mass of one mole of magnesium chloride?
  
• How do scientists use atomic spectra?
  
• How much mass is in a 3.25-mole sample of #NH_4OH#?
  
• When HCl is dissolved in qater, it can conduct electricity. Write chemical equation for the for the reaction that takes places when NaOH is added in the solution.?
  
• The density of ether is 0.714 g/mL. what is the mass of 1.45 L of ether?
  
• A 1.00 L flask contains nitrogen gas. what is the final partial pressure?
  
• Which type of bond is formed when Ammonia and hydrogen ion bond together to form ammonium ion?
  
• What is the energy in joules of one photon of microwave radiation with a wavelength 0.122 m? (c = 2.9979 x 108 m/s; h = 6.626 x 10–34 J×s)
  
• How many moles of NaCl will react completely with 18.5 L F2 gas at 300.0 K and 1.00 atm? 0.751 mol NaCl 1.33 mol NaCl 1.50 mol NaCl 2.66 mol NaCl
  
• What would be the volume of 6.00 g of helium gas at STP?
  
• Rank each of the elements in order of decreasing ionization energy: S, Cl, Br? (Justify)
  
• Write the equilibrium-constant expression for the reaction?
  
• What is the pH of pure water at 25.0 °C if the Kw at this temperature is #1.0 x 10-^14#?
  
• What does it mean if atoms have the same atomic number but a different atomic mass?
  
• What are the four quantum numbers in chemistry?
  
• Molecules in order of decreasing dipole-dipole strength?
  
• Is HBr a strong acid?
  
• How many atoms of oxygen are there in 18 g of water?
  
• How does ionization energy change down a group?
  
• How does the mass before a reaction compare to the mass after a reaction according to the law of conservation of mass?
  
• Which pair of bonds is more polar: P-Br and P-Cl?
  
• Hybridisation of XEF4?
  
• Potassium is highly reactive metal, while argon is an inert gas. How can you explain this difference based on their electron configurations?
  
• What do the sections between the lines on a phase diagram represent?
  
• What is the equilibrium constant of pure water at 25°C?
  
• Which of the following has highest first ionization energy? 1)Sc 2)K
  
• What does it mean if a molecule is polar?
  
• A highly concentrated ammonia solution is found to have a pH of 12.19 M. What is the hydroxide concentration, #["OH"^(-)(aq)]# in #"mol L"^-1#?
  
• How many lone pairs of electrons are on the #Xe# atom in #XeF_6#? A) 0 B) 3 C) 2 D) 1
  
• What is the kinetic molecular theory of gases? What is its purpose?
  
• What are concentration cells?
  
• What is the electromotive force?
  
• What is a galvanic cell?
  
• Are the changes produced by electrolysis chemical or physical in nature?
  
• How does a voltaic cell produce an electric current?
  
• Why does the rusting of iron make it thinner?
  
• In galvanic element Cr | Cr3+ ; Fe2+ | Fe in which direction will move the electrons?
  
• Why might a galvanic cell go dead?
  
• How much 1.7M solution of #(NH_4)_2SO_4# do you have to use so that it contains 0.230 g of the substance?
  
• Molecules of chlorine do not decompose into atomic chlorine. Why?
  
• What is the Lewis structure of #Cl_3#?
  
• How many valence electrons does cadmium have?
  
• What is the theoretical yield (in g) and percent yield of water in the reaction (%) ?
  
• How does increasing the pressure affect the reaction rate?
  
• Why does equilibrium exist?
  
• In which direction must the reaction proceed to reach equilibrium?
  
• Why is there no impact of pressure on a equilibrium condition when the number of molecule of gas reactant and the number of molecule of gas product are same? What will the theoretical explanation?
  
• How much ferrous sulfide will dissolve in one liter of water if its ksp is 3.7x10^-19?
  
• At 25 degrees Celsius the solubility of magnesium hydroxide is 0.00064 g/100 mL, how do you calculate the Ksp for Mg(OH)2?
  
• How do you determine molar solubility if ksp is given? The question that I was asked was if the ksp of calcium fluoride CaF2 is 4.0x10^-11 what is the molar solubility in water?
  
• What is dynamic equilibrium?
  
• How does change in concentration at equilibrium affects the value of #K_C# (equilibrium constant)?
  
• Calculate the mass of aluminum in 500 g of Al(C2H3O2)3 ?
  
• How many moles of NaOH are present in 26,5 mL of 0.190 M NaOH?
  
• 50.0 mL of a 0.269 M NaCl (aq) contain how many grams of solute?
  
• On the basis of strength of intermolecular forces, which of the following elements would be expected to have the highest melting point?
  
• 21. The heat of fusion for water is 6.009 kJ/mol. The heat of vaporization is 40.05 kJ/mol. The specific heat for water is 4.184 *b. What quantity of heat must be added to convert a 127g piece of ice at 0°C into water vapor at 100ºC?
  
• The kinetic theory assumes that collisions of gas particles are perfectly elastic. What does this statement mean?
  
• NaOH(s) + HCl (aq) --> NaCl (aq) Determine the mass of salt formed when 60g of sodium hydroxide combined with 60g of hydrochloric acid. What is the mass of the reactant that remains when the reaction has stopped?
  
• Why is ammonia considered a base?
  
• As the pH number of an acid decreases, what happens to the strength of the acid?
  
• If 1M of HCl is placed with 1L of water, how would the amount of H3O+ compare to that of a solution made from 1M of acetic acid placed in 1L of water?
  
• A chemist uses a solution of 0.226 M (KOH) to titrate 89.07 mL (H2SO4), she finds that it requires 34.00 mL of the base to reach the end-point of the titration. What is the molarity of the acid solution ? must be rounded to the correct number of sig figs
  
• How many milliliters of concentrated HCl (12.2 M) should be diluted to prepare 200.0 ml of an acid solution with a pH of 1.50?
  
• Explain arrhenious concept of acid and base ?
  
• Why is NaH a strong base?
  
• Which ones are weak and which are strong?
  
• What is the difference between a strong acid and a weak acid as well as a strong base versus a weak base with regards to ionization?
  
• Does using larger particles make a substance go slower or faster? How about using smaller particles?
  
• What evidence indicates that a base dissociates in water?
  
• Which ions are present when hydrochloric acid has exactly neutralized aqueos sodium hydroxide?(A )Na+,Cl-,H+ and OH- (b) Na +,Cl- and H+ (C) Na + and OH- (D)H+ and OH- Why is it A? DONT KNOW TELL ME.
  
• What is the conjugate base of HBr?
  
• What is the [H3O+] for a solution with a pH of 7.52?
  
• How can the law of conservation of mass apply to a burning log?
  
• Why noble gases are sparingly soluble in water ?
  
• What is the chemical formula for the following ionic compounds: Barium Sulfate, Manganese(II) Fluoride?
  
• What do we mean by a dynamic equilibrium? Can you describe how the development of a vapor pressure above a liquid represents such an equilibrium?
  
• How much heat is required to raise the temperature from 26 degree centigrade to 50 degree centigrade for 100 gr lead?
  
• What is the ClO− concentration of a mixture that is 0.310 M in HF and 0.100 M in HClO?
  
• If I combine two solutions of known concentrations and volumes, can I calculate the concentration of the new solution by adding the two concentrations together and dividing the result by 2?
  
• List the major types of intermolecular forces in order of in creasing strength. Is there some overlap?
  
• How does pressure affect phases of matter and intermolecular forces?
  
• Are dipole dipole forces stronger?
  
• Is intermolecular hydrogen bonding considered a van der Waals force?
  
• What are the types of intermolecular forces acting in the liquid state of krypton? What are the ones acting in the liquid state of nitrogen fluoride?
  
• Carbon tetrachloride is a nonpolar solvent. What are the intermolecular forces of attraction that exist in carbon tetrachloride?
  
• A 20.0 ml solution of Sr(OH)2 is neutralized after 25.0 ml of standard 0.05 M HCI is added. what is the concentration of Sr(OH)2? 2HCI+Sr(OH)2 2H2O+SrCI2
  
• In a titration experiment, a student finds that 25.49 mL of an NaOH solution is needed to neutralize 0.7137 g of a potassium hydrogen phthalate (KHP, a monoprotic acid with the formula KHC8H4O4). What is the concentration of the NaOH solution?
  
• 158 mL of a 0.148M NaCl solution is added to 228 mL of a 0.369M NH4NO3 solution. What's the concentration of ammonium ions?
  
• Are dipole-dipole forces or london dispersion forces stronger?
  
• How many liters of 0.150 M HCl would be required to react completely with 25.00 grams of calcium hydroxide?
  
• 0.650 L of 0.400 M #H_2SO_4# is mixed with 0.600 L of 0.280 M #KOH#. What concentration of sulfuric acid remains after neutralization?
  
• Are solutions pure substances?
  
• What is the molarity of a solution made by dissolving 67.3 g of lithium chloride in enough water to make 2.37 l of solution?
  
• A student mixes 0.79 grams of sodium carbonate into 50 mL of water. What is the molarity of the sodium carbonate solution?
  
• When 0.076 moles of iron(III) chloride are dis- solved in enough water to make 690 milliliters of solution, what is the molar concentration of chloride ions?
  
• What is the concentration of OH- ions in the final solution prepared by mixing 20ml of 0.05 M HCL with 30ml of 0.10M Ba(OH)2?
  
• What is the chemical equation for NH4OH dissolution in water?
  
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