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CDS Atoms & Nuclei Test 209
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CDS Atoms & Nuclei Test 209

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  • Question 1/5
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    Calculate number of atoms in 3 mol of NH3
    Solutions

    Number of atoms in one molecule of NH3 = 4

    Number of atoms in 3 mole of NH3 = 6.02 × 1023 × 3 × 4

    = 7.22 × 1024 atoms

  • Question 2/5
    1 / -0
    An alkane with 6 carbon atoms will have how many hydrogen atoms?
    Solutions

    • From the formula CnH2n+2

    • If n=6 then (2*6) +2=14 Hydrogen Atoms

  • Question 3/5
    1 / -0
    Heavy metals got their names because their atoms, as compared to other atoms, have-
    Solutions

    Arsenic, beryllium, cadmium, chromium, lead, manganese, mercury, nickel and selenium are some of the metals that are called 'heavy' because of their high relative atomic mass. They persist in nature and can cause damage or death to animals, humans and plants, even at very low concentrations.

  • Question 4/5
    1 / -0
    Atoms combine together because
    Solutions
    Lewis postulated that atoms achieve the stable octet when they are linked by chemical bonds. Atoms combine together to attain stable state or state of minimum energy.
  • Question 5/5
    1 / -0
    A piece of Cu contains 6.022 × 1024 atoms. How many moles of Cu atoms does it contain?
    Solutions

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