What volume of 0.1125 M K2Cr2O7 would be required to oxidize 68.16 mL of 0.3006 M Na2SO3 in acidic solution? The products include Cr3+ and SO42- ions.

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.

Answer earth,water,fire and air;