Tutor profile: Frank M.
Subject: Inorganic Chemistry
Two metal nitrates Q and R were heated strongly using a Bunsen Burner. When Q was heated, a colourless gas was evolved which rekindled a glowing splint. When R was heated, a brown gas was evolved in addition to the colourless gas. The brown gas turned moist blue litmus paper red and the colourless gas rekindled a glowing splint. a) State the group that Q and R are most likely found to be in. b) Give a balanced equation for the reaction of Q with heat. c) State the identity of the colourless gas when Q was heated. d) State the acid-base nature of the brown gas evolved when R was heated. e) Give a balanced equation for the reaction of R with heat.
a) Q is in group I and R is most likely in group II b) 2QNO3 --> 2QNO2 + O2 c) oxygen gas d) acidic e) 2R(NO3)2 --> 2RO + 4NO2 + O2
A substance X has a melting point of over 800 degrees celcius. It dissolves easily in water and while its aqueous solution conducts electricity, in its solid state X does not conduct electricity. a) Based on the information above, state the type of bonding most likely to be present in substance X. b) Which of the following substances below could be a candidate for substance X? I) carbon dioxide II) sodium chloride III) sulphur IV) copper
a) Ionic bonding b) II sodium chloride
Subject: Basic Chemistry
A particle consists of 13 protons, 14 neutrons and 10 electrons. a) Would this particle be considered an atom or an ion? b) State the charge of the particle named in part a) above
a) The particle is an ion b) The charge would be 3+
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