Evaluating Word Equations

Magnesium can be burned in oxygen to produce solid magnesium oxide.

• Mg + O₂→ MgO

• Mg+ O→ MgO

• Mg + CO₂ → MgO + C

• Mg + O₂→ Mg₂O₂

Sodium reacts with chlorine gas to produce sodium chloride.

• NaCl→ Cl + Na

• Na+ CO₂ → NaCO₂

• Na + Cl₂→ NaCl

• Na + Cl → NaCl

Iron reacts with solid sulfur to produce iron(II) sulfide powder.

• Fe + S → Fe₂S

• Fe + S → FeS

• Fe₂ + S→ Fe₂S₂

• Fe + S₂ → Fe₂S

When lead reacts with oxygen, a yellow lead(II) oxide powder is produced.

• Pb + O₂ → PbO

• Pb + O₂→ PbO₂

• Pb₂ + O₂→ Pb₂O

• Pb + O → PbO

When hydrogen reacts with sulfur, a smelly gas, dihydrogen monosulfide, is produced.

• H₂ + S → HS

• H₂ + S → H₂S

• H + S→ HS

• H + S→ H₂S

Magnesium metal reacts with oxygen to form magnesium oxide. The correct equation is

• Mg₂ + O₂ --> MgO

• Mg + O₂ --> MgO

• Mg₂ + O₂ --> Mg₂O₂

• Mg₂ + O₂ --> MgO

Hydrogen gas and nitrogen monoxide gas forms water and nitrogen gas.

• H₂ + NO --> H₂O + N₂

• H + NO --> H₂O + N

• H₂ + N₂O₃ --> H₂O + N₂

• H + NO --> H₂O + N₂

Potassium chlorate solid when heated produces potassium chloride solid and oxygen gas.

• KClO₃ + heat --> KCl + O₂

• PClO₃ + heat --> PCl + O₂

• KClO₃ + heat --> KCl + O

• KCl + heat --> KCl + O₂

sodium phosphate and calcium chloride produce calcium phosphate and sodium chloride

• Na₃PO₄ + CaCl₂ --> Ca₃(PO₄)₂ + NaCl

• Na₃PO₄ + CaCl₂ --> Ca₄PO₂ + NaCl

• NaPO₄ + CaCl₂ --> Ca(PO₄)₂ + NaCl

• NaPO₄ + CaCl₂ --> Ca₂(PO₄)3 + NaCl

Aluminum bromide and chlorine gas produce aluminum chloride and bromine gas.

• AlBr₃ + Cl₂ --> AlCl₃ + Br₂

• AlBr₃ + Cl --> AlCl₃ + Br

• Al₃Br + Cl --> Al₃Cl + Br₂

• AlBr₃ + Cl₂ --> AlCl₃ + Br