Questions asked by XIL1

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• A) name one non metal that exists as single atoms? B) name a non metal that exists as a liquid at ordinary temperatures.?
  
• Which two of the first thirty-six elements would you expect to from bond with the hreatest ionic character? Write the electronic configuration(s,p) for the ions involved?
  
• Write the formula for the compound usually formed when the elements of ionic numbers 6 and 16 combine toghether?
  
• Write the formula of the simplest chloride you would expect the element of atomic number 33 to form? Draw a diagram showing the bonding present in this chloride.State the sape of this chloride molecule?
  
• Name one non-metal which exists as single atoms? (first 36 elements)
  
• Give the formula of an ionic compound formed by an element in group 2 and show the charge on each ion.?
  
• Give the formula of a covalent compound formed by an element in group 5 and show clearly the electron structure of the molecule?
  
• Comment on the nature of the bonds you would expect to find in each of the compounds MgS and PH3?
  
• Explain why the boiling point of sodium chloride( NaCl) is so much higher than ALCL3 and PCL3 ?
  
• Hydrogen bonding exists in HF but now in HCL.Explain?
  
• Carbon dioxide has two polar bonds but it is a non-polar molecule, Explain?
  
• The following boiling points for noble gases.A) Name a type of forces that exist between the atoms? B) Suggest a reason for the icrease in boiling point?
  
• A)What type of bonds exists between the atoms in a molecule of hydrogen chloride? B)between molecules of hydrogen chloride?
  
• What type of bond is formed between chlorine and element of atomic number 19, explain why this chloride is a high melting point solid?
  
• Name the bond responsible for the force of attraction between water molecules and comment briefly on its effects on the properties of water?
  
• How many atoms are there in 0.36g of magnesium?
  
• What mass of magnesium contains the same number of atoms as 8.0g of calcium?
  
• How many moles of magnesium atoms are there in 0.2g of the metal?
  
• What mass of magnesium contains the same number of atoms as 7g of iron?
  
• Which of the three fertilisers ammonium nitrate NH4NO4, ammonium sulfate (NH4)2SO4 and urea (NH2)2CO contains the highest percentage of nitrogen?
  
• Calculate the percentage by mass of each element in the following compound?
  
• When 3.94g of hydrated copper(II) sulfate crystals were heated, 2.52g of the anhydrous salt remained, calculate the formula of the hydrated salt?
  
• 9.76g of a metal form 20.9g of its oxide whose formula is M2O. calculate the relative atomic mass of the metal?
  
• When glucose undergoes fermentation, ethanol and carbon dioxide are formed. #"C"_6"H"_12"O"_6 -> 2"C"_2"H"_5"OH" + 2"CO"_2#. Calculate the mass of ethanol that could be obtained from 25 g of glucose?
  
• The equation for the reaction of 6.5 g of zinc granules with 0.28 moles of nitric acid is as follows: 3Zn + 8HNO3  3Zn(NO3)2 + 2NO + 4H2O can some one do it please?
  
• Write an equation to show how the HSO4- ion can act as an Arrhenius acid and write an equation to show hoe HSO4- ion cam act as a Bronsted-Lower base?
  
• Indicate in each case base, acid and conjugate pairs?
  
• Iron reacts with dilute sulfaric acid according to equation, Fe+H2SO4---> FeSO4+H2, What mass of iron will react with 75cm3 of 0.5 M H2SO4?