Answers created by anor277

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• How do you calculate osmolarity from osmolality?
  
• Which elements may be existed using a bunsen burner flame?
  
• How does a non polar solute become soluble and insoluble in a non-polar solvent?
  
• What is the maximum number of covalent bonds a carbon atom can form with other atoms?
  
• What is the oxidation number of #"H"_2"O"# ?
  
• How are temperature on Celsius and Kelvin scales related?
  
• #2C_2H_2(l) + 5O_2(g) -> 4CO_2(g) + 2H_2O(g)# If the acetylene tank contains 37.0 mol of #C_2H_2# and the oxygen tank contains 81.0 mol of #O_2#, what is the limiting reactant for this reaction?
  
• How is water's phase diagram unique?
  
• How is entropy related to osmosis and diffusion?
  
• How many protons are in the nucleus of an atom of chlorine?
  
• What is the overall equation for the reaction which occurs when chlorine is bubbled into aqueous sulphur dioxide?
  
• An aluminium can of mass 100 g contains 200 g of water. Both, initially at 15 oC, are placed in a freezer at 5.0 oC. Calculate the quantity of heat that has to be removed from the water and the can for their temperatures to fall to -5.0 oC.?
  
• How do covalent bonds hold two atoms together?
  
• How many moles is in 79.3 g #Cl_2#?
  
• Why is it possible to detect potassium in the lower oxidizing zone and calcium, strontium and barium in the fusion zone?
  
• When vinegar and baking soda together, what is the new substance that is produced called?
  
• What is the first ionization energy?
  
• Can you see water molecules? Are water molecules moving?
  
• When granules NaOH are left in wet atmosphere, they first fade and then form a hard shell.?
  
• At room temperature, #CO_2# is a gas and #CS_2# is a liquid. Why is this reasonable?
  
• Why is m-cresol soluble in Bicarbonate Solution?
  
• How do yo write the orbital diagram for silver?
  
• How is ethyl alcohol made?
  
• Some help please ???
  
• What is solute concentration?
  
• Could someone explain to me how to identify the atom oxidized and the atom reduce for this equation?
  
• What is the chemical formula for Xantium hydroxide?
  
• What is the electron configuration of #Li# and #Li^+#?
  
• What is the resonance structure for benzyl alcohol (C6H5CH2OH) ?
  
• Home barbeques are fueled with propane gas (C_3H_8). What mass of carbon dioxide (in kg) forms upon the complete combustion of 18.9 propane (approximate contents of one 5-gallon tank)?
  
• Find the relation between Gibbs energy,enthalpy and entropy? Thanku
  
• How do you draw the Lewis dot structure for #KNO_3#?
  
• In a vacuum, will a heated solid sublime?
  
• What is the bond polarity of NH3?
  
• Which orbital do these transition metals are filling in? Sc, Ti, V, Cr?
  
• Boron is one position to the left of carbon on the periodic table. The atomic nurnber of carbon is 6. Given its position on the periodic table, what is the atomic number of boron?
  
• Consider the formula for glucose: #C_6H_12O_6#. What does this indicate about the relationship of the reactants to glucose?
  
• What happens during a chemical reaction?
  
• What is a product of respiration resulting from the breaking of carbon-carbon bonds?
  
• How many grams of #N_2# are produced from the reaction of 8.96 g of #H_2O_2# and 6.68 g of #N_2H_4#?
  
• Where does the energy to heat water for hot chocolate originally come from?
  
• What is the total volume of gaseous products formed when 199 liters of carbon monoxide react completely according to the following reaction? (All gases are at the same temperature and pressure.) #"CO(g) + H"_2"O(g)"##rarr##"CO"_2("g") + "H"_2("g")"#
  
• Balance the following redox reaction in acidic solution?
  
• The pressure in a container is 765.8 mmHg and the temperature is 36.4 degrees C and the volume needs a total of 25.4 cc (cm^3). The temperature rises to 63.0 deg C and the pressure changes to 9.01 atm.Convert pressure to mmHg and determine the new volume?
  
• What would be the compound formula of Strontium Bromide?
  
• Which of these compounds are soluble in water (or react with it)?
  
• What are some examples of naming Alkynes?
  
• Why copper sulphate is called blue vitriol?? Thank you.
  
• What are organisms that use chemical substances as a source of energy?
  
• Which period is Ca (20) in?
  
• 50mL of 1 mole of HCI was added to 50mL of 1 mole NaOH. What temperature change would be noticed?
  
• What is a mixture in which one substance dissolves in the other?
  
• One of the most commonly used compounds in the chlorination of swimming pools is sodium hypochlorite, #NaClO.# Once dissolved, an equilibrium is established between #ClO^-# and its conjugate acid. What is the equation of this reaction?
  
• The overall reaction in the body is described by the equation C6H12O6(aq) + 6O2(g) = 6CO2(g) + 6H2O(l). How many grams of oxygen are required to convert 23.0 g of glucose to CO2 and H2O? What is the number of g of CO2 produced?
  
• What is a Bronsted-Lowry acid?
  
• What is the density of a piece of wood that has a mass of #2.74# #g# and a volume of #3.10# #cm^3#?
  
• What is the atomic number of carbon-14?
  
• Why does production of nickel and copper metals from their ores involve sulfur dioxide emissions?
  
• Why are metals used to make electric wire and electrical goods?
  
• How do you write the noble-gas electron configuration for manganese?
  
• How do atomic numbers change in the periodic table?
  
• Jonah measures the amount of medicine he takes usin an eyedropper. What units of measurement would best describes the amount of medicine Jonah takes?
  
• Explain three exaples of Diastereomers ,enantiomers , mesomers ??? With 3D structures
  
• What are comparable properties of Magnesium and Magnesium Oxide?
  
• Ammonia is produced in the reaction #3H_2 + N_2 -> 2NH_3#. What mass of #NH_3# could be produced if 12.5 #H_2# reacts with excess nitrogen?
  
• How is freezing point depression a colligative property?
  
• What must an Arrhenius acid contain?
  
• If Ac-208 loses a neutron, what is left?
  
• How would you determine the molecular formula of C4H9?
  
• How do you convert 0.45 g of sodium hydroxide, NaOH to moles?
  
• What is the pressure exerted by 1.2 mol of a gas with a temperature of 20°C and a volume of 9.5 L?
  
• Would you expect a dynamic equilibrium in a liquid in an open container?
  
• A sample of an ideal gas has a volume of 2.28 L at 289 K and 1.01 atm. What is the pressure when the volume is 1.65 L and the temperature is 305 K?
  
• How calculate this ?
  
• Write a balanced oxidation reduction equation, in acidic solution, for the below reaction?
  
• What is the basic formula of a dehydration reaction?
  
• How do you draw the lewis structure for NO2?
  
• What are three types of chemical bonds? Do all compounds contain a single type of bond?
  
• Round 0.89756 to 2sf?
  
• How are polyatomic ions named?
  
• What is the effect on matter of solidification? Thanks!
  
• What are the periodic trends?
  
• What did scientists divide elements into?
  
• How do you use stoichiometry to convert moles to mass?
  
• How to solve this ?
  
• What are the isomers for C510?
  
• Which four elements are the primary components of important biological molecules, such as proteins, fats and carbohydrates?
  
• A gas has a pressure of 713 mm Hg at a temperature of 24°C. What will the Kelvin temperature be if the pressure is increased to 3.71 atm?
  
• What are some examples of neutralization reactions?
  
• What is the Gram Formula Mass (g) of Sodium Acetate (NaCH3COO)?
  
• Which one in this reaction is endothermic and which one is exothermic : A + B + Heat ⇌ C + D + E ?
  
• How do I find the First half equivalence point pH and the second half equivalence point pH of kmno4+h2c2o4+h2so4 titration ?
  
• A mole of sulfur trioxide molecules contains how many oxygen atoms?
  
• What results from gas particles no having a strong attraction to one another?
  
• What volume is occupied by 500 g of fluorine gas at 5.00oC at a pressure of 735 Torr?
  
• How many grams of Kr are in a 2.74 L cylinder at 58.7 °C and 2.99 atm?
  
• What is a type of suspension that does not settle out under normal conditions?
  
• How is a hypothesis useful?
  
• How do states of matter change properties?
  
• How do solutions differ from suspensions?
  
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