| A | B |
| Solids aluminum and sulfur react to produce solid aluminum sulfide | aluminum(s) + sulfur(s) ---> aluminum sulfide(s) |
| Liquid water and dinitrogen pentoxide gas react to produce aqueous hydrogen nitrate | water(l) + dinitrogen pentoxide (g) ---> hydrogen nitrate (aq) |
| The gases nitrogen dioxide and oxygen react to produce dinitrogen pentoxide gas | nitrogen dioxide(g) + oxygen(g) ---> dinitrogen pentoxide(g) |
| Ethane gas burns in air, producing carbon dioxide gas and water vapor | ethane(g) ---> carbon dioxide(g) + water(g) + energy |
| Nickel(II) hydroxide (aq) decomposes to produce solid nickel(II) oxide and liguid water | nickel(II) hydroxide(aq) ---> nickel(II) oxide(s) + water(l) |
| Heating a chunk of sodium hydrogen carbonate produces a solution of sodium carbonate, water and carbon dioxide bubbles | sodium hydrogen carbonate(s) --heat--> sodium carbonate(aq) + water(l) + carbon dioxide(g) |
| When solid naphthalene burns in air, the products are gaseous carbon dioxide and liquid water | naphthalene(s) --heat--> carbon dioxide(g) + water(l) |
| Bubbling hydrogen sulfide fas through manganese(II) chloride dissolved in water results in the formation of the precipitate manganese(II) sulfide and hydrochloric acid | hydrogen sulfide(g) + manganese(II) shloride(aq) ---> manganese(II) sulfide(s) + hydrochloric acid(l) |
| Solid magnesium reacts with nitrogen gas to produce solide magnesium nitride | magnesium(s) + nitrogen(g) ---> magnesium nitride(s) |
| Heating oxygen difluoride gas yields oxygen gas and fluorine gas | oxygen difluoride(g) ---> oxygen(g) + fluorine(g) |
| A reaction occurs when a dilution of hydrosulfuric acid is mixed with an aqueous solution of iron(III) bromide. Solid iron(III) sulfide and hydrobromide solution are produced. | hydrosulfuric acid(aq) + iron(III) bromide(aq) ---> iron(III) sulfide + hydrobromide(aq) |