DOUBLE JEOPARDY
100

Balance the following reaction and translate it to written word.

CH4 + O2 → CO2 + H2O

2CH4 + O2 → 2CO2 + 4H2O

“Two moles of methane (carbon tetrahydride) reacts with oxygen to yield two moles of carbon dioxide and four moles of water (dihydrogen monoxide).” 

200

Balance the following reaction and translate it to written word.

Ca + O2 → CaO

2Ca + O2 → 2CaO

“Two moles of calcium reacts with oxygen to yield two moles of calcium oxide.” 

This is a Synthesis Reaction.

300

Balance the following reaction and translate it to written word.

Al2O3 → Al + O2

2Al2O3 → 4Al + 3O2

“Two moles of aluminum oxide yields four moles of aluminum and three moles of oxygen.” 

This is a Decomposition Reaction.

400

Balance the following reaction, translate it to written word, and identify what type of reaction it is.

AlBr3 + Cl2 → AlCl3 + Br2

2AlBr3 + 3Cl2 → 2AlCl3 + 3Br2

“Two moles of aluminum bromide reacts with three moles of chlorine to yield two moles of aluminum chloride and three moles of bromine.” 

This is a Single-Replacement Reaction.

500

Balance the following reaction, translate it to written word, and identify what type of reaction it is.

Na2S + HCl → NaCl + H2S

Na2S + 2HCl → 2NaCl + H2S

“Sodium sulfide reacts with two moles of hydrogen chloride to yield two moles of sodium chloride and hydrogen sulfide.” 

This is a Double-Replacement Reaction.