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{"segment":[{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" K\u00ed hi\u1ec7u h\u00f3a h\u1ecdc ${{S}_{KN{{O}_{3}}\\,({{20}^{0}}C)}}=31,6\\,gam$ cho bi\u1ebft:","select":["A. \u1ede ${{20}^{0}}C$ \u0111\u1ed9 tan c\u1ee7a $KN{{O}_{3}}$ l\u00e0 31,6 gam.","B. \u1ede ${{20}^{0}}C$ n\u1ed3ng \u0111\u1ed9 ph\u1ea7n tr\u0103m c\u1ee7a $KN{{O}_{3}}$ l\u00e0 31,6 gam.","C. \u1ede $31,{{6}^{0}}C$ \u0111\u1ed9 tan c\u1ee7a $KN{{O}_{3}}$ l\u00e0 20 gam. ","D. \u1ede $31,{{6}^{0}}C$ n\u1ed3ng \u0111\u1ed9 ph\u1ea7n tr\u0103m c\u1ee7a $KN{{O}_{3}}$ l\u00e0 20gam."],"hint":"","explain":"<span class='basic_left'>${{S}_{KN{{O}_{3}}\\,({{20}^{0}}C)}}=31,6\\,gam$ c\u00f3 ngh\u0129a l\u00e0 \u1edf ${{20}^{0}}C$ \u0111\u1ed9 tan c\u1ee7a $KN{{O}_{3}}$ l\u00e0 31,6 gam.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2460},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Dung d\u1ecbch $HCl$ 1M cho ta bi\u1ebft l\u00e0:","select":["A. 1 l\u00edt dung d\u1ecbch $HCl$ c\u00f3 1 mol$HCl$. ","B. 100 gam dung d\u1ecbch $HCl$ c\u00f3 1 mol $HCl$. ","C. 100 gam dung d\u1ecbch $HCl$ c\u00f3 1 gam $HCl$. ","D. 1 l\u00edt dung d\u1ecbch $HCl$ c\u00f3 1 gam $HCl$. "],"hint":"","explain":"<span class='basic_left'>1M l\u00e0 n\u1ed3ng \u0111\u1ed9 mol c\u1ee7a dung d\u1ecbch $HCl$: trong 1 l\u00edt dung d\u1ecbch c\u00f3 1 mol $HCl$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2461},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" Khi l\u00e0m bay h\u01a1i 50g m\u1ed9t dung d\u1ecbch mu\u1ed1i th\u00ec thu \u0111\u01b0\u1ee3c 0,5g mu\u1ed1i khan. H\u1ecfi l\u00fac \u0111\u1ea7u, dung d\u1ecbch c\u00f3 n\u1ed3ng bao nhi\u00eau ph\u1ea7n tr\u0103m:","select":["A. 1,1% ","B. 1% ","C. 1,5% ","D. 3% "],"hint":"","explain":"<span class='basic_left'>$C\\%=\\dfrac{{{m}_{ct}}}{{{m}_{\\text{dd}}}}.100\\%=\\dfrac{0,5}{50}.100\\%=1\\%$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2462},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" \u0110\u1ed9 tan c\u1ee7a $KN{{O}_{3}}$\u1edf ${{40}^{0}}C$ l\u00e0 70g. S\u1ed1 gam $KN{{O}_{3}}$c\u00f3 trong 340g dung d\u1ecbch \u1edf nhi\u1ec7t \u0111\u1ed9 tr\u00ean l\u00e0:","select":["A. 140g ","B. 130g","C. 120g ","D. 110g "],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed9 tan c\u1ee7a $KN{{O}_{3}}$\u1edf ${{40}^{0}}C$ l\u00e0 70g n\u00ean ta c\u00f3: <br\/> Trong 100 gam n\u01b0\u1edbc c\u00f3 70 gam $KN{{O}_{3}}$ <br\/> $\\Rightarrow $ Trong 170 gam dung d\u1ecbch c\u00f3 70 gam $KN{{O}_{3}}$ <br\/> Trong 340 gam dung d\u1ecbch c\u00f3 x gam $KN{{O}_{3}}$ <br\/> $\\Rightarrow x=\\dfrac{340.70}{170}=140\\,gam$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2463},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Dung d\u1ecbch \u0111\u01b0\u1eddng 10% cho ta bi\u1ebft l\u00e0:","select":["A. Trong 100 gam dung d\u1ecbch c\u00f3 10 gam \u0111\u01b0\u1eddng","B. Trong 100 gam dung d\u1ecbch c\u00f3 10 mol \u0111\u01b0\u1eddng","C. Trong 1 l\u00edt dung d\u1ecbch c\u00f3 10 mol \u0111\u01b0\u1eddng","D. Trong 1 l\u00edt dung d\u1ecbch c\u00f3 10 gam \u0111\u01b0\u1eddng"],"hint":"","explain":"<span class='basic_left'>Dung d\u1ecbch \u0111\u01b0\u1eddng 10% cho ta bi\u1ebft trong 100 gam dung d\u1ecbch c\u00f3 10 gam \u0111\u01b0\u1eddng<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2464},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Kh\u1ed1i l\u01b0\u1ee3ng $CuS{{O}_{4}}$c\u1ea7n \u0111\u1ec3 thu \u0111\u01b0\u1ee3c 400 gam dung d\u1ecbch $CuS{{O}_{4}}$ 5% l\u00e0","select":["A. 10 gam","B. 15 gam","C. 20 gam ","D. 25 gam "],"hint":"","explain":"<span class='basic_left'>${{m}_{CuS{{O}_{4}}}}=\\dfrac{{{m}_{\\text{dd}}}.C\\%}{100\\%}=\\dfrac{400.5\\%}{100\\%}=20\\,gam$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2465},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Kh\u1ed1i l\u01b0\u1ee3ng n\u01b0\u1edbc c\u1ea7n \u0111\u1ec3 thu \u0111\u01b0\u1ee3c 400 gam dung d\u1ecbch $CuS{{O}_{4}}$ 5% l\u00e0 ","select":["A. 390 gam ","B. 385 gam ","C. 380 gam ","D. 275 gam "],"hint":"","explain":"<span class='basic_left'>${{m}_{CuS{{O}_{4}}}}=\\dfrac{{{m}_{\\text{dd}}}.C\\%}{100\\%}=\\dfrac{400.5\\%}{100\\%}=20\\,gam\\Rightarrow {{m}_{{{H}_{2}}O}}=400-20=380\\,gam$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2466},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Kh\u1ed1i l\u01b0\u1ee3ng \u0111\u01b0\u1eddng (${{C}_{6}}{{H}_{12}}{{O}_{6}}$) c\u1ea7n d\u00f9ng \u0111\u1ec3 pha 200 ml dung d\u1ecbch \u0111\u01b0\u1eddng 0,1M l\u00e0:","select":["A. 1,4 gam ","B. 2,7 gam ","C. 3,6 gam ","D. 4,1 gam "],"hint":"","explain":"<span class='basic_left'>${{m}_{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}={{C}_{M}}.V=0,1.0,2=0,02\\,mol\\Rightarrow {{m}_{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}=0,02.180=3,6\\,gam$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2467},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" N\u1ed3ng \u0111\u1ed9 mol c\u1ee7a 800 ml dung d\u1ecbch ch\u1ee9a 8 gam $NaOH$ l\u00e0:","select":["A. 0,1M ","B. 0,15M ","C. 0,25M ","D. 0,4M "],"hint":"","explain":"<span class='basic_left'>${{n}_{NaOH}}=\\dfrac{8}{40}=0,2\\,mol\\Rightarrow {{C}_{M}}=\\dfrac{n}{V}=\\dfrac{0,2}{0,8}=0,25\\,M$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2468},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" Kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a ${{H}_{2}}S{{O}_{4}}$c\u00f3 trong 300 ml dung d\u1ecbch ${{H}_{2}}S{{O}_{4}}$ 0,5 M l\u00e0:","select":["A. 9,8 gam","B. 14,7 gam ","C. 19,6 gam ","D. 20 gam"],"hint":"","explain":"<span class='basic_left'>${{n}_{{{H}_{2}}S{{O}_{4}}}}={{C}_{M}}.V=0,3.0,5=0,15\\,mol\\Rightarrow {{m}_{{{H}_{2}}S{{O}_{4}}}}=0,15.98=14,7\\,gam$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2469},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Th\u1ec3 t\u00edch dung d\u1ecbch $KN{{O}_{3}}$ 0,2 M ch\u1ee9a 5,05 gam $KN{{O}_{3}}$l\u00e0:","select":["A. 100 ml ","B. 200 ml","C. 250 ml ","D. 300 ml"],"hint":"","explain":"<span class='basic_left'>$\\begin{aligned} & {{n}_{KN{{O}_{3}}}}=\\dfrac{5,05}{101}=0,05\\,mol \\\\ & V=\\dfrac{n}{{{C}_{M}}}=\\dfrac{0,05}{0,2}=0,25\\,L=250\\,ml \\\\ \\end{aligned}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2470},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" C\u00e2u n\u00e0o \u0111\u00fang, trong c\u00e1c c\u00e2u sau?","select":["A. Qu\u00e1 tr\u00ecnh ho\u00e0 tan mu\u1ed1i \u0103n v\u00e0o n\u01b0\u1edbc l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh ho\u00e1 h\u1ecdc","B. S\u1eaft b\u1ecb g\u1ec9 l\u00e0 m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng v\u1eadt l\u00ed","C. Nh\u1eefng nguy\u00ean t\u1eed c\u1ee7a c\u00e1c \u0111\u1ed3ng v\u1ecb c\u00f3 c\u00f9ng s\u1ed1 notron trong h\u1ea1t nh\u00e2n ","D. N\u1ed3ng \u0111\u1ed9 % c\u1ee7a dung d\u1ecbch cho bi\u1ebft s\u1ed1 gam ch\u1ea5t tan trong 100g dung d\u1ecbch"],"hint":"","explain":"<span class='basic_left'>D. N\u1ed3ng \u0111\u1ed9 % c\u1ee7a dung d\u1ecbch cho bi\u1ebft s\u1ed1 gam ch\u1ea5t tan trong 100g dung d\u1ecbch<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2471},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" \u0110\u1ed9 tan c\u1ee7a mu\u1ed1i $NaCl$ \u1edf ${{20}^{0}}C$ l\u00e0 30g. \u1edf nhi\u1ec7t \u0111\u1ed9 n\u00e0y dung d\u1ecbch b\u00e3o ho\u00e0 $NaCl$ c\u00f3 n\u1ed3ng \u0111\u1ed9 ph\u1ea7n tr\u0103m l\u00e0:","select":["A. 28 % ","B. 26,72 % ","C. 23 % ","D. 30,05 % "],"hint":"","explain":"<span class='basic_left'>$C\\%=\\dfrac{{{m}_{ct}}}{{{m}_{\\text{dd}}}}.100\\%=\\dfrac{30}{30+100}.100\\%\\approx 23\\%$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2472},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Trong 225ml n\u01b0\u1edbc c\u00f3 ho\u00e0 tan 15g $KCl$. N\u1ed3ng \u0111\u1ed9 ph\u1ea7n tr\u0103m c\u1ee7a dung d\u1ecbch l\u00e0: (bi\u1ebft ${{d}_{{{H}_{2}}O}}=1\\,g\/ml$) ","select":["A. 6,25 % ","B. 10 % ","C. 12,4 % ","D. 13,1 % "],"hint":"","explain":"<span class='basic_left'>$\\begin{aligned} & {{m}_{{{H}_{2}}O}}=V.d=225.1=225\\,gam \\\\ & {{m}_{\\text{dd}}}=225+15=240\\,gam \\\\ & C\\%=\\dfrac{{{m}_{ct}}}{{{m}_{\\text{dd}}}}.100\\%=\\dfrac{15}{240}.100\\%=6,25\\% \\\\ \\end{aligned}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2473},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Khi ho\u00e0 tan 50g \u0111\u01b0\u1eddng glucoz\u01a1 (${{C}_{6}}{{H}_{12}}{{O}_{6}}$) v\u00e0o 250g n\u01b0\u1edbc \u1edf ${{20}^{0}}C$ th\u00ec thu \u0111\u01b0\u1ee3c dung d\u1ecbch b\u00e3o ho\u00e0. \u0110\u1ed9 tan c\u1ee7a \u0111\u01b0\u1eddng \u1edf ${{20}^{0}}C$ l\u00e0:","select":["A. 20g","B. 10g","C. 15g ","D. 30g "],"hint":"","explain":"<span class='basic_left'>\u1ede ${{20}^{0}}C$250 gam n\u01b0\u1edbc h\u00f2a tan t\u1ed1i \u0111a 50 gam \u0111\u01b0\u1eddng \u0111\u1ec3 t\u1ea1o th\u00e0nh dung d\u1ecbch b\u00e3o h\u00f2a <br\/> 100 gam n\u01b0\u1edbc h\u00f2a tan t\u1ed1i \u0111a x gam \u0111\u01b0\u1eddng \u0111\u1ec3 t\u1ea1o th\u00e0nh dung d\u1ecbch b\u00e3o h\u00f2a <br\/> $\\Rightarrow x=\\dfrac{100.50}{250}=20\\,gam\\Rightarrow $ \u0110\u1ed9 tan c\u1ee7a \u0111\u01b0\u1eddng l\u00e0 20 gam.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2474},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" \u0110\u1ed9 tan c\u1ee7a $KN{{O}_{3}}$ \u1edf $40^0C$ l\u00e0 70g. S\u1ed1 gam $KN{{O}_{3}}$c\u00f3 trong 340g dung d\u1ecbch b\u00e3o h\u00f2a \u1edf nhi\u1ec7t \u0111\u1ed9 tr\u00ean l\u00e0:","select":["A. 140g","B. 130g","C. 120g ","D. 110g"],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed9 tan c\u1ee7a $KN{{O}_{3}}$\u1edf 400C l\u00e0 70g n\u00ean ta c\u00f3: <br\/> 100 gam n\u01b0\u1edbc h\u00f2a tan t\u1ed1i \u0111a 70 gam $KN{{O}_{3}}$ \u0111\u1ec3 t\u1ea1o th\u00e0nh dung d\u1ecbch b\u00e3o h\u00f2a <br\/> 170 gam dung d\u1ecbch b\u00e3o h\u00f2a c\u00f3 ch\u1ee9a 70 gam $KN{{O}_{3}}$ <br\/> 340 gam dung d\u1ecbch b\u00e3o h\u00f2a c\u00f3 ch\u1ee9a x gam $KN{{O}_{3}}$ <br\/> $\\Rightarrow x=\\dfrac{340.70}{170}=140\\,gam$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2475},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Bi\u1ebft ${{S}_{{{K}_{2}}S{{O}_{4}}\\,({{20}^{0}}C)}}=11,1\\,gam$. N\u1ed3ng \u0111\u1ed9 % c\u1ee7a dung d\u1ecbch ${{K}_{2}}S{{O}_{4}}$ b\u00e3o h\u00f2a \u1edf nhi\u1ec7t \u0111\u1ed9 n\u00e0y l\u00e0:","select":["A. 5% ","B. 7% ","C. 10% ","D. 12% "],"hint":"","explain":"<span class='basic_left'>${{S}_{{{K}_{2}}S{{O}_{4}}\\,({{20}^{0}}C)}}=11,1\\,gam\\Rightarrow $11,1 gam ${{K}_{2}}S{{O}_{4}}$tan trong 100 gam n\u01b0\u1edbc \u0111\u1ec3 t\u1ea1o th\u00e0nh dung d\u1ecbch b\u00e3o h\u00f2a <br\/> $\\begin{aligned} & \\Rightarrow {{m}_{\\text{dd}}}=100+11,1=111,1\\,gam \\\\ & \\Rightarrow C\\%=\\dfrac{{{m}_{ct}}}{{{m}_{\\text{dd}}}}.100\\%=\\dfrac{11,1}{111,1}.100\\%\\approx 10\\% \\\\ \\end{aligned}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2476},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" L\u1ea5y m\u1ed7i ch\u1ea5t 10g ho\u00e0 tan ho\u00e0n to\u00e0n v\u00e0o n\u01b0\u1edbc th\u00e0nh 200ml dung d\u1ecbch. H\u1ecfi dung d\u1ecbch ch\u1ea5t n\u00e0o c\u00f3 n\u1ed3ng \u0111\u1ed9 mol l\u1edbn nh\u1ea5t:","select":["A. $N{{a}_{2}}C{{O}_{3}}$ ","B. $N{{a}_{2}}S{{O}_{4}}$ ","C. $Na{{H}_{2}}P{{O}_{4}}$ ","D. $Ca{{(N{{O}_{3}})}_{2}}$ "],"hint":"","explain":"<span class='basic_left'>${{C}_{M}}=\\dfrac{n}{V}$. V kh\u00f4ng \u0111\u1ed5i $\\Rightarrow {{C}_{M}}$ l\u1edbn nh\u1ea5t khi n l\u1edbn nh\u1ea5t. M\u00e0 $n=\\dfrac{m}{M}$. Kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i l\u00e0 10 gam $\\Rightarrow $ n l\u1edbn nh\u1ea5t khi M nh\u1ecf nh\u1ea5t. Trong 4 \u0111\u00e1p \u00e1n ch\u1ec9 c\u00f3 \u0111\u00e1p \u00e1n A c\u00f3 M nh\u1ecf nh\u1ea5t <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2477},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" Ho\u00e0 tan h\u1ebft 19,5g Kali v\u00e0o 261g ${{H}_{2}}O$. N\u1ed3ng \u0111\u1ed9 % c\u1ee7a dung d\u1ecbch thu \u0111\u01b0\u1ee3c l\u00e0: (cho r\u1eb1ng n\u01b0\u1edbc bay h\u01a1i kh\u00f4ng \u0111\u00e1ng k\u1ec3).","select":["A. 9,98% ","B. 10% ","C. 15% ","D. 20% "],"hint":"","explain":"<span class='basic_left'>$\\begin{aligned} & {{n}_{K}}=\\frac{19,5}{39}=0,5\\,mol \\\\ & 2K+2{{H}_{2}}O\\to 2KOH+{{H}_{2}}\\uparrow \\\\ & 0,5\\,mol\\,\\,\\,\\,\\,\\,0,5\\,mol\\,\\,\\,\\,0,25\\,mol \\\\ & {{m}_{\\text{dd}}}={{m}_{K}}+{{m}_{{{H}_{2}}O}}-{{m}_{{{H}_{2}}}}=19,5+261-0,25.2=280\\,gam \\\\ & {{m}_{KOH}}=0,5.56=28\\,gam \\\\ & \\Rightarrow C\\%=\\frac{{{m}_{ct}}}{{{m}_{\\text{dd}}}}.100\\%=\\frac{28}{280}.100\\%=10\\% \\\\ \\end{aligned}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2478},{"time":24,"part":[{"title":"Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n \u0110\u00daNG","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" Kh\u1ed1i l\u01b0\u1ee3ng n\u01b0\u1edbc c\u1ea7n \u0111\u1ec3 pha \u0111\u01b0\u1ee3c 150 gam dung d\u1ecbch $CuS{{O}_{4}}$ 5% t\u1eeb dung d\u1ecbch $CuS{{O}_{4}}$ 20%.","select":["A. 98 gam ","B. 100,5 gam","C. 112,5 gam ","D. 125,4 gam "],"hint":"","explain":"<span class='basic_left'>$\\begin{aligned} & {{m}_{CuS{{O}_{4}}}}=\\dfrac{{{m}_{\\text{dd}}}.C\\%}{100\\%}=\\dfrac{150.5\\%}{100\\%}=7,5\\,gam \\\\ & \\Rightarrow {{m}_{\\text{dd}\\,CuS{{O}_{4}}\\,20\\%}}=\\dfrac{{{m}_{ct}}.100\\%}{C\\%}=\\dfrac{7,5.100\\%}{20\\%}=37,5\\,gam \\\\ & \\Rightarrow {{m}_{{{H}_{2}}O}}=150-37,5=112,5\\,gam \\\\ \\end{aligned}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2479}],"lesson":{"save":0,"level":2}}

Điểm của bạn.

Câu hỏi này theo dạng chọn đáp án đúng, sau khi đọc xong câu hỏi, bạn bấm vào một trong số các đáp án mà chương trình đưa ra bên dưới, sau đó bấm vào nút gửi để kiểm tra đáp án và sẵn sàng chuyển sang câu hỏi kế tiếp

Trả lời đúng trong khoảng thời gian quy định bạn sẽ được + số điểm như sau:
Trong khoảng 1 phút đầu tiên + 5 điểm
Trong khoảng 1 phút -> 2 phút + 4 điểm
Trong khoảng 2 phút -> 3 phút + 3 điểm
Trong khoảng 3 phút -> 4 phút + 2 điểm
Trong khoảng 4 phút -> 5 phút + 1 điểm

Quá 5 phút: không được cộng điểm

Tổng thời gian làm mỗi câu (không giới hạn)

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Bấm vào đây nếu phát hiện có lỗi hoặc muốn gửi góp ý