(b) When water reacts with potassium metal the hydrogen produced ignites explosively on the surface of water.

(ii) Write an equation to show how this ignition occurs.
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What happens to energy in an open system?

Remember to use the proper number of significant figures and leading zeros in all calculations. gelatin has a density of 1.27 g/cm³. if you have a blob of gelatin dessert that fills a 2.0 liter bottle, what is its mass? 2540 g2500 g3.9 x 10-43.937x 10-4

Name the element in group 17, period 2. (periodic table)