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Ionic compounds have high melting points: Explain why and explain why Calcium Oxide has a higher melting point than Lithium Chloride

Ionic compounds are formed when electrostatic attractions form between oppositely charged ions. These attractions are strong and so require a large amount of energy to break. This energy is provided in the h...
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Answered by Sam M. • Chemistry tutor
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How might I go about balancing chemical equations?

First let us look at what the specification asks of you as a student: E.g. AQA GCSE chemistry specification 4.3.2.3 Using moles to balance equations (HT only) The balancing numbers in a symbol equation can b...
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Answered by Claudia G. • Chemistry tutor
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Why does iodine have a higher boiling point than chlorine?

Iodine is a larger molecule, with more electrons, than chlorine. Therefore Iodine has stronger intermolecular forces than chlorine, which require more energy to break. This results in Iodine having a higher ...
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Answered by Ben W. • Chemistry tutor
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Explain covalent bonding and give an example of a simple covalent molecule.

A covalent bond is a shared pair of electrons between 2 atoms.An example of a simple covalent molecule is CH 4 (methane)
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Answered by Zoe S. • Chemistry tutor
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25cm3 NaOH was titrated with 0.05mol dm-3 HCl. 21.5m3 of HCl neutralised 25cm3 of NaOH. What is the concentration of NaOH in mol dm-3?

NaOH + HCl --> NaCl + H 2 O 1 : 1 : 1 moles (mol) = concentration (mol dm -3 ) x volume (dm 3 ) n(HCl) = 0.05 (mol dm -3 ) x 21.5/1000 (dm 3 ) = 0.001075 moles (1.075 x 10 -3 ) Using 1:1 molar ratio: n(Na...
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Answered by Britta A. • Chemistry tutor
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