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chemistry

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for each of the following synthesis reaction indentify the missing reactant(s) or product(s) and then balance the resulting equation
a) Mg +__________ ----------> MgO
b) _________ + O2-----------> Fe2O3
c) Li + Cl2 -------> _________
d) Ca + __________------> CaI2

  • chemistry - ,

    Tell me what you don't understand about these problems. It appears obvious to me that the first one must have O2 added to it to obtain MgO.
    Mg + O2 ==> MgO, then balance by
    2Mg + O2 ==> 2MgO
    The others are done the same way.

  • chemistry - ,

    so for B) would it be 2Fe2O3?
    c) 1LiCl2
    d) 2Cal2

  • chemistry - ,

    B is Fe + O2 ==> Fe2O3. then balance to give
    4Fe + 3O2 ==> 2Fe2O3
    C is Li + Cl2==> LiCl (the valence of Li is 1 and Cl is 1; therefore, the formula is LiCl. Then balance.
    d. Ca + I2 ==> CaI2, then balance.

  • chemistry - ,

    so C is 1Li1Cl
    d is Ca2l2?

  • chemistry - ,

    C is
    Li + Cl2 ==> LiCl, then if you want to balance it it is
    2Li + Cl2 ==> 2LiCl (Placing a 1, as in Li1Cl, is not wrong BUT no one does it BECAUSE if we write Li we imply there is one of Li; therefore, we don't write the 1s, only numbers that are not 1. )
    I don't know where you get Ca2I2?

    Ca + I2 ==> CaI2 and it is balanced as is.

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