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Explain the trend in ionization energy down a group of the periodic table.

Ionization energy is the energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions. This is the following process; X g ---> X+ g + e- When an a...
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Answered by Euan W. • Chemistry tutor
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Name and describe the type of bonding in H2O

The bonds in H 2 O are covalent bonds. Covalent bonds are formed when two atoms share a pair of electrons, often where one electron is donated by each atom. This forms a bond as there is an electrostatic att...
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Answered by William S. • Chemistry tutor
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How can I apply the knowledge I learn in lessons to tougher exam style questions ?

The million dollar question when it comes to chemistry and is often the difference between a good grade and a great grade. The basis of this is to consolidate your basic concepts, make sure those are instill...
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What's the difference between an ionic bond and a covalent bond?

They're both similar but form between different types of elements. An ionic bond will form between a metal and a non-metal. The metal will donate electrons and the non-metal will accept the electrons, formin...
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Answered by George S. • Chemistry tutor
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Potassium Chlorate(VII) decomposes to produce Potassium Chloride and Oxygen. Using the following data calculate the enthalpy change of this decomposition: Enthalpy of formation(KClO4) = -430 kJ mol-1, Enthalpy of formation(KCl) = -440 kJ mol-1

Firstly the equation of this decomposition should be worked out to be the following KClO 4 (s) --> KCl(s) + 2O 2 (g) The enthalpy of formation has been given for both KClO 4 and KCl, so from this we know ...
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