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