GCSE Chemistry Test DIRT 0.0 / 5 ? ChemistryRevisionGCSEEdexcel Created by: Lewis 2001Created on: 06-11-16 10:58 GCSE Chemistry Test DIRT ----------------------------------------------------------------- 1 of 5 Explain why Argon is used in a light bulb This is because they are noble gases, they are all inert and will not react with oxygen when they become hot, so, they wont burn out. 2 of 5 Explain why Sodium floats as a ball in water Sodium has a lower density, which is lighter in water and has a low melting point. 3 of 5 Write the balanced equation for the reaction of Sodium with water with state symbols. 2Na (s) + 2H2O (l) = 2Na(OH) (aq) + H2 (g) 4 of 5 Explain why Lithium, Sodium and Potassium are in group 1 of the periodic table Group 1 is known as the "the alkali metals". They all have 1 electro 5 of 5
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