[Anonymoose]

Today in chem we learned about Synthesis/decomposition and single replacement reactions and our teacher gave us a worksheet to do. Can you guys check my answers and tell me what I did wrong (as I obviously don't feel comfortable with rxns yet)?

My answers are in red

Write a net ionic equation for the following.  The net-ionic equation need not be balanced:

1. A strip of magnesium metal is heated strongly in pure nitrogen gas

Mg + N₂ --> Mg₃N₂

2. A sample of calcium carbonate is heated.

CaCO₃ --> CaO + CO₂

3. Molten aluminum chloride is electrolyzed.

AlCl₃ --> Al^3- + 3Cl³⁺

4. Sulfur dioxide gas is bubbled through water.

SO₂ --> no clue

5. Solid potassium oxide is added to a container of carbon dioxide gas.

KO_(s) + CO_{2 (g)} --> no clue either

6. Liquid hydrogen peroxide is warmed.

H₂O₂ --> H₂O + O₂

7. Solid lithium oxide is added to water.

LiO + H₂O --> H₂O + O₂


8. A pea-sized piece of sodium is added to a container of iodine vapor.

Na + I --> no idea

9. A sample of carbonic acid is heated

CO₃ --> CO + O₂

10. A sample of potassium chlorate is heated.


KCl --> K + Cl

11. Solid magnesium oxide is added to sulfur trioxide gas.

MgO + SO₃ --> MgSO₄


12. Equal volumes of equimolar solutions of phosphoric acid and potassium hydroxide are mixed


No Idea where to even begin haha

13. Solutions of cobalt(II) nitrate and sodium hydroxide are mixed

Co(NO₃)₂ + NaOH --> no clue


Thanks for the assistance!

[AWK]

3. Molten aluminum chloride is electrolyzed.

AlCl3 --> Al3- + 3Cl3+

4. Sulfur dioxide gas is bubbled through water.

SO2 --> no clue

5. Solid potassium oxide is added to a container of carbon dioxide gas.

KO(s) + CO2 (g) --> no clue either

2Al3⁺ + 3Cl^- = 2Al + 3Cl₂
SO₂ + H₂O = H₂SO₃
K₂O + CO₂ = K₂CO₃

7. Solid lithium oxide is added to water.

LiO + H2O --> H2O + O2


8. A pea-sized piece of sodium is added to a container of iodine vapor.

Na + I --> no idea

9. A sample of carbonic acid is heated

CO3 --> CO + O2

10. A sample of potassium chlorate is heated.


KCl --> K + Cl

Li₂O  + H₂O = LiOH
H₂CO₃ = H₂O + CO₂
KCl is very stable

12. Equal volumes of equimolar solutions of phosphoric acid and potassium hydroxide are mixed


No Idea where to even begin haha

13. Solutions of cobalt(II) nitrate and sodium hydroxide are mixed

Co(NO3)2 + NaOH --> no clue

H₃PO₄ + KOH = KH₂PO₄ + ...
Co(NO₃)₂ + KOH = Co(OH)₂(s) + .

[Padfoot]

10. A sample of potassium chlorate is heated.


KCl --> K + Cl

KCl is potassium chloride.  Potassium chlorate is KClO₃

[AWK]

KCLO₃ = KCl + KCLO₄
KCLO₄ = KCl + O₂