Metals like potassium and sodium react violently with cold Strontium and barium have reactivities similar to that of lithium. Sodium is less dense than water and will float on water’s surface as it reacts. Does hot water and cold water have the same amount of molecules? here is the answer.. when a piece of sodium is added in water it goes round making a hissing sound which shows that the gas is exothermic.. hope it helps. As it reacts it produces hydrogen. - Room 15 Lusher School, St. Louis, Missouri The number of molecules in some water isn't affected by changing its temperature. Metal oxides that are soluble in water dissolve in it to further form metal hydroxide. These metals react with cold water with increasing vigor to give the metal hydroxide and hydrogen. > Metals react with water and produce a metal oxide and hydrogen gas. Compound A when dissolved in water gives a compound B which is used in whitewashing. Calcium, for example, reacts fairly vigorously and exothermically Compound B reacts with C O 2 to form a white precipitate of compound C. Identify A, B, C. Also write the equations involved. (i) Write an equation, with state symbols, for this reaction. How does sodium react with cold water - 3295022 hey!! Its surface naturally forms a very thin layer of aluminium oxide that keeps water away from the metal below. (ii) State two observations that could be made during this reaction. (d) Radium reacts vigorously when added to water. *plz mark as It reacts faster with hot water! The reaction makes it hot enough to melt into a silvery ball. In hot water the Are they the same? Aluminium is unusual because it is a reactive metal that does not react with water.