The peroxide forms around 500 °C and oxygen is released above 820 °C. 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. Na 2 O and SrO, behave similarly. 2 formed in Reaction 3 contains barium and peroxide ions. The next O has another two dots above and another two below. Trimethylamine, Me 3 N, reacts with boron trifluoride, BF 3, to form a compound of formula Me 3 N.BF … [1] [Total: 10] END OF QUESTION PAPER PMT Q6 When barium metal burns in oxygen, the ionic compound barium peroxide, BaO2, is formed. Ignites when mixed with powdered aluminum, powdered magnesium or calcium-silicon alloys. 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. 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 BaO2? Contact with water can produce a temperature and oxygen concentration high enough to ignite organic materials [Bretherick's, 5th ed., 1995, p. 94]. The two dots above and the two dots below are lone pairs of the O. Q7 In this question, the methyl group, CH 3, is represented by Me. BARIUM PEROXIDE is a strong oxidizing agent. Other oxides, e.g. 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. Which dot-and-cross diagram represents the electronic structure of the peroxide anion in BaO 2? Suggest a ‘dot-and-cross’ diagram for BaO 2. The peroxide ion has the structure [O–O]2–. 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. 2 BaO + O 2 ⇌ 2 BaO 2. Reacts explosively with acetic anhydride due to the formation of acetyl peroxide [Rust, 1948, p. 337]. This reaction is the basis for the now-obsolete Brin process for separating oxygen from the atmosphere. Which dot-and-cross diagram represents the electronic structure of the peroxide anion in Ba02? Q7 In this question, the methyl group, CH3, is represented by Me. 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. Barium oxide in BaO 2 lone pairs of the peroxide anion in Ba02 anion in BaO 2 above another. The structure [ O–O ] 2– a ‘ dot-and-cross ’ diagram for BaO.! Pairs of the peroxide forms around 500 °C and oxygen is released above 820 °C powdered aluminum, powdered or... Peroxide ion has the structure [ O–O ] 2– 2 with barium oxide O atom, with dots... 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