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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)
ZS
Answered by Zoe S. • Chemistry tutor
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Describe the shape of and bonding in a molecule of benzine. Explain why benzene doesn't readily undergo reactions.

Flat 6-membered ring with 6 carbons. Each carbon in bonded two 1 hydrogen and 2 other carbons. Because a carbon must always have 4 bonds, there is a delocalised fourth electron on each carbon, which moves ar...
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Answered by Michal Z. • 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...
BA
Answered by Britta A. • Chemistry tutor
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Name Group 0 in the periodic table. What is the tree in boiling points and why?

The Noble GasesThe boiling points increase as you go down the group. This is because the atoms get larger and the intermolecular forces become more numerous and stronger hence more energy is needed to break ...
EB
Answered by Ellie B. • Chemistry tutor
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Bethan prepared some ethoxyethane (line 6) by reacting ethanol with concentrated sulfuric acid. She used 69g of ethanol (Mr=46) and obtained a 45% yield of ethoxyethane (Mr=74). Calculate the mass of ethoxyethane obtained.

Equation from line 6 is: 2 (ethanol) -------> 1 (ethoxyethane) 2. The ratio of reaction is 2:1. This is the ratio of moles not mass , i.e., 2 moles of ethanol give 1 mole of ethoxyethane. 3. We need to kn...
SD
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