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. This reaction is the basis for the now-obsolete Brin process for separating oxygen from the atmosphere.  [Total: 10] END OF QUESTION PAPER PMT The peroxide forms around 500 °C and oxygen is released above 820 °C. Other oxides, e.g. Q7 In this question, the methyl group, CH3, is represented by Me. 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. Reacts explosively with acetic anhydride due to the formation of acetyl peroxide [Rust, 1948, p. 337]. Suggest a ‘dot-and-cross’ diagram for BaO 2. The two dots above and the two dots below are lone pairs of the O. Q6 When barium metal burns in oxygen, the ionic compound barium peroxide, BaO2, is formed. 2 BaO + O 2 ⇌ 2 BaO 2. Trimethylamine, Me 3 N, reacts with boron trifluoride, BF 3, to form a compound of formula Me 3 N.BF … Q7 In this question, the methyl group, CH 3, is represented by Me. 2 formed in Reaction 3 contains barium and peroxide ions. 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. The peroxide ion has the structure [O–O]2–. 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? BARIUM PEROXIDE is a strong oxidizing agent. Then the first O atom, with two dots above, two dots below, and two on the right. Na 2 O and SrO, behave similarly. When barium metal burns in oxygen, the ionic compound barium peroxide, Ba02, is formed. The next O has another two dots above and another two below. Which dot-and-cross diagram represents the electronic structure of the peroxide anion in BaO 2? Which dot-and-cross diagram represents the electronic structure of the peroxide anion in Ba02? 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 . Show outer shell electrons only. 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 arises by the reversible reaction of O 2 with barium oxide.
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