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Calculated the Relative Molecular Mass of calcium (II) chloride using the periodic table.

Calcium (II) has a charge of 2+ and each chloride has a -1 charge giving a formula of CaCl2 when balancing the charges out. Ca (Relative Atomic Mass) = 40.08 and Cl (Relative Atomic Mass) = 35.45So Relative ...
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Answered by Gabriel L. • Chemistry tutor
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Periodicity shows a fairly smooth increasing trend across a period for ionisation energy. However, between groups 2 & 3 and groups 5 & 6, the trend doesn't appear to be followed. Using your knowledge of chemistry, explain why the trend isn't followed here

For elements in group 2, their valence electrons consist of "ns 2 " where n is the principle quantum number/shell number. However, for elements in group 3, their valence electrons consist of "...
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Answered by George W. • Chemistry tutor
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Draw the full structual diagram of ethyl-ethanoate, labeling relevent bond angles and explain why the molecule has this structure.

(unable to draw diagram and upload in this format) ethyl ethanoate has the semi structural formula of CH3COOCH2CH3. According to electron repulsion theory the bond angle around the second carbon atom would b...
Answered by • Chemistry tutor
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Plan out a 4 step organic synthesis to form N-methyl Butanamide from 1-Bromopropane. Include relevant reagents and conditions for each reaction. Include 1 mechanism for one of the stages.

The chain length needs to be extended by 1, so we can use NaCN dissolved in ethanol to extend the carbon chain by 1. This will produce butanenitrile. Mechanism here. 2) Now that the nitrile is formed, we can...
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Answered by George W. • Chemistry tutor
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Draw a dot-cross diagram of Chlorine Triflouride, and discuss the shape exhibited by the molecule

(Drawing cannot be put into this area). The shape of this molecule is influenced by the bonding regions and lone pair regions (lone pairs repel more than bonded pairs). The molecule has 2 lone pairs and 3 bo...
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Answered by George W. • Chemistry tutor
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