PHNG GIO DC V O TO HUYN TAM NNG K THI CHN HC SINH GII CP HUYN NM HC 2011-2012 chnh thc Mn: Ha hc 9 (Thi gian lm bi 150 pht khng k giao )

Cu 1(4 im): a, Vit phng trnh ha hc cc phn ng xy ra cho tng th nghim: - Cho kh NO2 sc qua dd nc vi trong d. - Ha tan oxit st t bng dd H2SO4 long. - Cho pirit st (FeS2) phn ng vi HCl. - in phn dd NaCl c mng ngn. b, Bit khi lng mol ca mt oxit l 80. Thnh phn v khi lng oxi trong oxit l 60%. Xc nh cng thc oxit v gi tn. Cu 2(3 im): Ch dng kim loi, hy nhn bit cc dung dch sau y: HCl, HNO3 c, AgNO3, KCl, KOH Vit phng trnh phn ng xy ra trong qu trnh nhn bit ? Cu 3(4 im): trung ha 100g dd H2SO4 19,6% cn va 250g dd NaOH. a, Tnh nng phn trm ca dd NaOH dng ? b, Tnh nng phn trm ca dd thu c sau phn ng ? Cu 4(3 im): Ha tan 4,4 g hn hp gm (Mg,MgO) bng dd HCl 7,3% va . Sau phn ng thu c 2,24 lt kh (ktc). a, Vit PTHH ? b, Tnh khi lng ca mi cht trong hn hp ban u ? c, Tnh khi lng dd HCl dng ha tan hn hp trn ? Cu 6(3 im): Cho mt bn st c khi lng 50g vo mt dd ng sunfat. Sau mt thi gian nhc bn st ra, khi lng bn st l 51g . Tnh s phn t gam mui st to thnh sau phn ng. Bit rng tt c ng(Cu) sinh ra u bm trn bn st.Th sinh c s dng Bng h thng tun hon cc nguyn t ha hc.