The peroxide forms around 500 °C and oxygen is released above 820 °C. Other oxides, e.g. The peroxide ion has the structure [O–O]2–. 2 formed in Reaction 3 contains barium and peroxide ions. Which dot-and-cross diagram represents the electronic structure of the peroxide anion in BaO 2? Na 2 O and SrO, behave similarly. Contact with water can produce a temperature and oxygen concentration high enough to ignite organic materials [Bretherick's, 5th ed., 1995, p. 94]. BARIUM PEROXIDE is a strong oxidizing agent. The next O has another two dots above and another two below. Show outer shell electrons only. Barium peroxide arises by the reversible reaction of O 2 with barium oxide. Which dot-and-cross diagram represents the electronic structure of the peroxide anion in Ba02? When barium metal burns in oxygen, the ionic compound barium peroxide, Ba02, is formed. Then the first O atom, with two dots above, two dots below, and two on the right. 3 © UCLES 2008 9701/01/M/J/08 [Turn over 4 When barium metal burns in oxygen, the ionic compound barium peroxide, BaO2, is formed. This reaction is the basis for the now-obsolete Brin process for separating oxygen from the atmosphere. Q7 In this question, the methyl group, CH 3, is represented by Me. Trimethylamine, Me 3 N, reacts with boron trifluoride, BF 3, to form a compound of formula Me 3 N.BF … Ignites when mixed with powdered aluminum, powdered magnesium or calcium-silicon alloys. Which dot-and-cross diagram represents the electronic structure of the peroxide anion in BaO2? [1] [Total: 10] END OF QUESTION PAPER PMT Q7 In this question, the methyl group, CH3, is represented by Me. Suggest a ‘dot-and-cross’ diagram for BaO 2. Q6 When barium metal burns in oxygen, the ionic compound barium peroxide, BaO2, is formed. H with a cross and a dot on the right hand side, showing that the H atom donates one electron and the O donates one electron to the single bond. A Cl B CN C CO 2 CH 3 D OH Q6 When barium metal burns in oxygen, the ionic compound barium peroxide, BaO 2, is formed. 000 x x 00 x x ox x key electron from first oxygen atom electron from second oxygen atom electron from barium atom Skin cancer can be treated using a radioactive isotope of phosphorus, ISP . The two dots above and the two dots below are lone pairs of the O. Reacts explosively with acetic anhydride due to the formation of acetyl peroxide [Rust, 1948, p. 337]. 2 BaO + O 2 ⇌ 2 BaO 2.

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