and is very hard. All these properties together suggest it is giant covalent rather than small molecular. 3 Connor is probably wrong. Water also has a low melting point, but giant ionic substances have high melting points. Water could be giant ionic or small molecular. Because water only conducts at high voltages it is probably small molecular. Data cards Substance A White crystalline solid Description Very high melting temperature Effect of heat Dissolves in water to give colourless solution Solubility in water Does not dissolve in cyclohexane Solubility in other solvent – cyclohexane
and is very hard. All these properties together suggest it is giant covalent rather than small molecular. 3 Connor is probably wrong. Water also has a low melting point, but giant ionic substances have high melting points. Water could be giant ionic or small molecular. Because water only conducts at high voltages it is probably small molecular. Data cards Substance A Description White crystalline solid Effect of heat Very high melting temperature Solubility in water Dissolves in water to give colourless solution Solubility in other solvent – cyclohexane Does not dissolve in cyclohexane
Structure%20and%20bonding%20-%20Teacher%20guidance.docx