Module 8: Chemical Reactions

Balancing

100

__ Na + __ O₂ = __ Na₂O

4Na + O₂  = 2Na₂O

200

__ N₂ + __ H_{2 = __} NH₃

N₂ + 3H₂ = 2NH₃

300

__ HCl + __NaOH = __ NaCl + __H₂O

HCl + NaOH = NaCl + H₂O

already balanced!! 

400

__ K + __B₂O₃ = __ K₂O + __ B

6K + B₂O₃ = 3K₂O + 2B

500

__ CH₄ + __ O₂ = __ CO₂ + __H₂O

CH₄ +  2O₂ = CO₂ + 2H₂O

Writing Formulas

100

Nitrogen gas reacts with hydrogen gas to form ammonia gas (nitrogen trihydride).

N₂ + H₂ = NH₃

200

Sodium metal reacts with chlorine gas to form sodium chloride.

Na + Cl₂ = NaCl

300

Solid iron reacts with copper(II) sulfate solution to produce solid copper and iron(II) sulfate solution.

Fe + CuSO₄ = Cu + FeSO₄

400

Calcium carbonate decomposes upon heating to form calcium oxide and carbon dioxide.

CaCO₃ = CaO + CO₂

500

Nitrogen trihydride and hydrochloric acid react to produce ammonium chloride

NH₃ + HCl = NH₄Cl

Naming Molcules

100

name: CO

carbon monoxide

200

CH₄

carbon tetrahydride

300

Potassium Carbonate

K₂CO₃

400

Phosphoric Acid

H₃PO₄

500

NH₄Cl

Ammonium chloride

(ammonium is polyatomic: NH₄⁺¹)

Predicting Products

100

Fe(III) + O₂ = 

Fe₂O₃

200

Fe(III) + CuCl₂

Cu + FeCl₃

300

HCl + NaOH = 

H₂O + NaCl

400

CH₄ + O₂

H₂O + CO₂

500

Na₃PO₄ + CaCl₂

NaCl + Ca₃(PO₄)₂

Identifying Precipitates

100

HF(  ) + Ba(NO₃)₂ (  ) = HNO₃ (   ) + BaF₂ (   ) 

all aqueous except BaF₂ = solid

200

Ba(NO₃)₂( )  + Na₂SO₄( ) = BaSO₄( ) + 2NaNO₃ ( ) 

BaSO₄ = solid 

300

AgNO₃( ) +NaCl( )  → AgCl ( )+NaNO₃(  )

AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)

400

Na₂CO₃( )+2HCl( )→2NaCl ( )+H₂O( )+CO₂( )

Na2CO3(aq)+2HCl(aq)→2NaCl (aq)+H2O(L)+CO2(g)

500

H2SO4( )+2KOH( )→K2SO4( )+2H2O( )

H2SO4(aq)+2KOH(aq)→K2SO4(aq)+2H2O(l)