Science Homework Help

• 1.
  State if the following changes involve
  oxidation (O)
  or reduction (R) or neither (N)

  Fe²⁺ → Fe^{3+ O}

  I₂ → I¯ R

  F₂ → F₂O R

  C₂O₄^2- →
  CO_{2 O}

  H₂O₂ →
  O₂ O

  2.
  Balance the following half equations…

  Na+ e- → Na ⁺

  Fe²⁺ → Fe³⁺ +e –

  I_{2 +} 2e- →
  2 I^¯

  The following table shows the successive ionisation energies for Carbon and Oxygen;

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Element	1st	2nd	3rd	4th	5th	6th	7th	8th
Carbon	1086.5	2352.6	4620.5	6222.7	37831	47277.0	–	–
Oxygen	1313.9	3388.3	5300.5	7469.2	10989.5	13326.5	71330	84078.0

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Use this table to predict the electron configurations of these elements.

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Carbon	1s2 2s2 2p2
Oxygen	1s2 2s2 2p4

Please can you check if my answers are correct and guide me, please? Thank you in advance

• What will be the usual and the maximum oxidation state in compounds of:

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	Li	Br	Sr	O	B	N
Usual	+1	7	+2	-2	+3	+5
Maximum	+1	+9	+2	+8	+5	+7