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Physical Science

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Which of the following is a single replacement?

a. KOH + HCl --> KCl + H2O
b. 2Na + 2H2O --> H2 + 2NaOH
c. 2C2H6 + 7O2 --> 4CO2 + 6H2O
d. H2O + CO2 --> H2CO3

Any help would be appreciated, thank you in advance!

  • Physical Science -

    a. K goes with Cl and H goes with OH so this is a double replacement.
    b. Na is a single item, it replaces ther H of H2O so this is a single replacement.
    c. This is a combustion reaction
    d. When two somethings combine to make one something that is a combination or synthesis reaction.

  • Physical Science -

    it should be "b"

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