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What is the oxidation state of chlorine (Cl) in HClO?

The oxidation state of O is -2, and +1 for H, so as HClO is neutral overall, the oxidation state of Cl in HClO is +1.
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Answered by Ishan J. • Chemistry tutor
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When going down group 1 on the periodic table, what happens to reactivity?

As you go down the group:shielding increases as electron numbers increase, this means that the distance between the nucleus and outer electron is further and attraction is weaker between the positive nucleus...
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Answered by Sanjni B. • Chemistry tutor
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Why is the first ionisation energy of barium larger than the first ionsiation energy of caesium?

Barium has one more proton than caesium. The outer electrons of both elements are in the same shell so they feel the same shielding effect. However, as barium has one more proton, barium's outer electrons wi...
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Answered by Jeremy L. • Chemistry tutor
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pH and Kw question: A student dissolves 1.75g of a drain cleaner (based on NaOH) in water and makes the solution up to 100cm3. The student measures the solution pH as 13.60. Determine the percentage of NaOH in the drain cleaner, in terms of mass (g).

[H + ] = 10 -pH , so [H + ] = 10 -13.6 = 2.5 x 10 -14 moldm -3 . pH=-log 10 ([H + ]), so we have rearranged this to make [H + ] the subject of the formula. K w = [H + ] x [OH - ] = 1.0 x 10 -14 moldm -3 . Th...
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Answered by Laura N. • Chemistry tutor
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Give the IUPAC name for the following molecule and draw its displayed formula: CH3(CH2)3COOH

IUPAC name stem comes from the longest chain of carbon atoms, in this case five atoms giving pentan-, and the suffix comes from the most important functional group in the molecule, in this case the carboxyli...
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Answered by Lewis K. • Chemistry tutor
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