Questions asked by engkusyema m.

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• When 3.0 g of carbon is burnt in 8.0 g of oxygen, 11.0 g of carbon dioxide is produced. what is the mass of carbon dioxide will be formed when 3.0 g of carbon is burnt in 50.0 g of oxygen? Which law of chemical combination will govern the answer?
  
• A small quantity of gas is let into a large evacuated chamber. i) How much of the chamber gets filled with the gas? ii) What property of the gas helps it to do so?
  
• Calculate the pH and the concentrations of all species present, #"H"_3"O"^(+)#, #"F"^(-)#, #"HF"#, and #"OH"^(-)#, in #"0.05 M HF"# ?
  
• The nucleotide sequence of one DNA strand of a DNA double helix is 5-ʹGGATTATTGTGCACTTTCA-3ʹ. What is the sequence of the complementary strand and briefly explain the answer?
  
• Draw and compare all the possible stereoisomers for 2,3-pentanediol and 2,4- pentanediol. Which stereoisomers are chiral? Which are achiral?
  
• For a diploid human cell, state how many copies of each chromosome are present in each cell (or soon to be daughter cell)? a) start of mitosis b) end of mitosis c) start of meiosis d) end of meiosis e) end of meiosis ll
  
• What is the possible arrangement of the isomers of molecular formula C4H9Cl in order of decreasing rate of reaction with sodium iodide in acetone?