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explain why there is a decrease in first ionisation energy between elements phosphorus and sulfur

The electrons are packed in singly occupied orbitals in the 3p subshell in phosphorus, however in sulfur, the 4th electron is placed into an orbital that already has an electron. Because electrons are negati...
SS
Answered by Sagar S. • Chemistry tutor
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explain why barium sulfate is used in barium meals despite being toxic

barium sulfate is insoluble
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Answered by Sagar S. • Chemistry tutor
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What is the difference between an ionic lattice and a metallic lattice?

Many elements readily form ions because their electron configurations are more stable if electrons are added or removed, usually in order to ensure that the outermost shell is a full octet. An ionic compound...
AL
Answered by Adam L. • Chemistry tutor
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A student reacts 50.0cm^3 of 2.00mol dm^-3 HCl with 25.0cm^3 NaOH. What is the concentration of NaOH?

n(HCl) = 0.05 dm^3 x 2 mol dm^-3 = 0.1 mol Ratio HCl : NaOH = 1 : 1 = 0.1 mol : 0.1 mol c(NaOH) = 0.1 mol / 0.025 dm^3 = 0.4 mol dm^-3
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Answered by Sam W. • Chemistry tutor
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Explain why cyclohexene will react with bromine gas but benzene will not

Cyclohexene contains a double bond, which has a greater electron density than the system of pi-bonds present in a benzene molecule. This means that a dipole can be induced in the bromine molecule due to the ...
SR
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