Chemistry 2.0 / 5 based on 1 rating ? ChemistryGCSEAQA Created by: megan foxallCreated on: 19-05-13 12:11 what is the formula that belongs to a sodium ion? Na+ 1 of 13 which atoms gain electrons to form negative ions? Non-metals 2 of 13 what do metals form? they form positive ions from losing electrons 3 of 13 what is ionic bonding? when oppositely charged ions attract 4 of 13 when does sodium chloride conduct electricity? in molten or in solution 5 of 13 the structure of magnesium oxide is... giant ionic lattice 6 of 13 What is the formula for magnesium chloride (Mg2+ and Cl? ions)? MgCl2 7 of 13 What is the formula for calcium hydroxide ( Ca2+ and OH? ions)? Ca(OH)2 8 of 13 Why does sodium chloride have a lower melting point than magnesium chloride? Its positive ions are larger but have a smaller charge 9 of 13 Explain the conductivity of sodium chloride. Ionic compounds conduct electricity when molten because their ions are free to move. 10 of 13 How many electrons are involved in each covalent bond? Two 11 of 13 Which sort of elements form covalent bonds? Non-metals form covalent bonds. 12 of 13 Which of these has molecules with two atoms joined by a covalent bond? Chlorine 13 of 13
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