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Atoms and Molec...

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  • Question 1
    1 / -0

    Which of the following is a quantity necessary to determine the molecular formula of a compound?

  • Question 2
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    What is the molar mass of ammonium carbonate $${({NH}_{4})}_{2}{CO}_{3}$$?

  • Question 3
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    How many grams are there in a $$7.0$$ mole sample of sodium hydroxide?

  • Question 4
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    Which of the following contains the least number of molecules?

  • Question 5
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    The reaction between dinitrogen monoxide, $$N_{2}O$$ and oxygen gas, $$O_{2}$$, carried out at high pressures, results in the formation of dinitrogen tetroxide, $$N_{2}O_{4}$$, as the only product. The unbalanced equation for the reaction is:

    $$N_{2}O(g) +O_{2}(g)\rightarrow N_{2}O_{4}(g)$$

    Given the legend and the $$N_{2}O/O_{2}$$ mixture shown below.
    Which of the following represents the composition of the system after the reaction has gone to completion?

  • Question 6
    1 / -0

    A student carries out the following reaction in the laboratory:


    Sodium carbonate + Copper sulphate $$\rightarrow $$ Copper carbonate + Sodium sulphate

    How could you determine the reaction obeyed the law of conservation of mass?

  • Question 7
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    Identify the anion from $$KClO_3$$.

  • Question 8
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    The total number of atoms present in $$CO_3^{2-}$$ is__________. 

  • Question 9
    1 / -0

    Which of the following would weight the least?

  • Question 10
    1 / -0

    Compound is different from molecule because, _________.

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