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orlabee 13 questions

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Questions in this quiz (13)

  1. 1What is the Relative formula mass (Mr) of CO (carbon monoxide)? Carbon=12, Oxygen=16.
    1. A28
    2. B192
  2. 2What is the Relative atomic mass of a sodium atom?
    1. A11
    2. B23
  3. 3What is the relative formula mass of sodium oxide (Na2O)? Ar sodium=23, Ar oxygen=16.
    1. A39
    2. B62
  4. 4If you convert the relative atomic mass or the relative formula mass of an atom into grams, you get 1mole of the chemical.
    1. ATrue
    2. BFalse
  5. 5What is the equation to find the % mass of an element in a compound?
    1. A% mass of an element in a compound = Ar x number of atoms (of that element) / Mr (of whole compound)
    2. B% mass of an element in a compound = Ar x number of atoms (of whole compound) / Mr (of that element)
  6. 6Take NaOH. What is the % mass of oxygen?
    1. A40%
    2. B65%
  7. 7What is the empirical formula of a compound?
    1. AThe smallest ratio of atoms present in a compound
    2. BSomething that enables you to rule the world!
  8. 8This is how you calculate the empirical formula of a compound:
    1. Write down the mass of each element
    2. Divide the mass by the relative atomic mass (Ar) of the element
    3. Divide the numbers by the smallest number to get the ratio of elements
    4. Put the ratios in their simplest forms
    1. ATrue
    2. BFalse
  9. 9A compound is made from 72g carbon and 12g of hydrogen. What is its empirical formula?
    1. AC2H
    2. BCH2
  10. 10How do you calculate moles?
    1. Am= n x M
      (m=mass, n=moles, M=molar mass)
    2. BM=n x m
      (m=mass, n=moles, M=molar mass)

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Description
Chemistry Unit 2
Author
orlabee
Language
English
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