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Word equations to balanced chemical equations drill Each of the following slides first gives you a word equation.

Word equations to balanced chemical equations drill Each of the following slides first gives you a word equation. You must write the balanced chemical equation, with phases, then click ahead to check your work. Each slide is numbered, so you can do some, come back and then do more.

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Word equations to balanced chemical equations drill Each of the following slides first gives you a word equation.

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  1. Word equations to balanced chemical equations drill Each of the following slides first gives you a word equation. You must write the balanced chemical equation, with phases, then click ahead to check your work. Each slide is numbered, so you can do some, come back and then do more. Practice makes perfect.

  2. Aluminum and oxygen form aluminum oxide

  3. Aluminum and oxygen form aluminum oxide 4Al(S) + 3O2(G) 2Al2O3 (S) Why you might have got this one wrong: Oxygen is a HONClBrIF twin, Al is a +3 cation and oxygen is a -2 anion

  4. Methane combusts

  5. Methane combusts CH4(G) + 2O2(G) CO2(G) + 2H2O(G) + energy • Why you might have got this one wrong: • Oxygen is a HONClBrIF twin, combustion always forms carbon dioxide and water as the only two products

  6. Rubidium metal is put into calcium nitrate solution

  7. Rubidium metal is put into calcium nitrate solution 2Rb(S) + Ca(NO3)2 (AQ) 2RbNO3(AQ) + Ca(S) Why you might have got this one wrong: Rubidium makes only a +1 cation while calcium is a +2, so forming rubidium nitrate can only be in a 1:1 ratio. That “2” in the calcium nitrate needs to be BALANCED away, not stuck in as Rb(NO3)2 because it seems easier to do.

  8. Cobalt (III) chlorate solution and magnesium chromate solutions are mixed together

  9. Cobalt (III) chlorate solution and magnesium chromate solutions are mixed together 2Co(ClO3)3 (AQ) + 3MgCrO4(AQ) Co2(CrO4)3(S) + 3Mg(ClO3)2(AQ) Why you might have got this one wrong: You didn’t switch the anions for each of the two cations (Cobalt +3 and Mg +2) You did not look at table F correctly, chromates are insoluble precipitates You did not carefully look how the products form:Co+3 with CrO4-2, Mg+2 with ClO3-1

  10. Hydrogen iodide gas decomposes

  11. Hydrogen iodide gas decomposes 2HI(G) H2(G) + I2(S) Why you might have got this one wrong: Hydrogen and iodine are both HONClBrIF twins when pure

  12. Carbon and hydrogen form ethane (C2H6) gas

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  14. Carbon and hydrogen form ethane (C2H6) gas 2C(S) + 3H2(G) C2H6(G) Why you might have got this one wrong: This one was too easy to get wrong, but hydrogen is a HONClBrIF twin, carbon is NOT

  15. Propanol combusts (C3H7OH)

  16. Propanol combusts (C3H7OH) 2C3H7OH(G) + 6O2(G) 6CO2(G) + 7H2O(G) + energy Why you might have got this one wrong: This one was the hardest of all, you have oxygen in 2 places on both sides of the arrow. No matter what, it works, if you go slowly, back and forth, over and over. In this equation the “odd” oxygen is in the propanol, in order to balance the oxygen atoms we have to double the propanol, even though that wrecks all of the carbons and hydrogens. “We have to kill the equation in order to save it.” If anyone gets that reference, +10!

  17. Bromine is poured into lithium iodide solution

  18. Bromine is poured into lithium iodide solution Br2(L) + 2LiI(AQ) 2LiBr(AQ) + I2(S) Why you might have got this one wrong: Bromine and iodine are both on the left side of table J, this is an ANION replacement, not a cation one (which are much more common since there are way more cations than anions on this table. Bromine and iodine are both HONClBrIF twins.

  19. Barium nitrate solution is mixed with sodium sulfate solution

  20. Barium nitrate solution is mixed with sodium sulfate solution Ba(NO3)2(AQ) + Na2SO4(AQ) 2NaNO3(AQ) + BaSO4(S) Why you might have got this one wrong: Check the ion charges: Ba+2, NO3-1, Na+1, and SO4-2 Switch the cations with the opposite anions, and fix the product ratios before you balance the equation. Look hard at table F, sulfates are usually aqueous, but barium is an exception.

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