{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh nhi\u1ec7t dung ri\u00eang c\u1ee7a m\u1ed9t kim lo\u1ea1i, ng\u01b0\u1eddi ta b\u1ecf v\u00e0o nhi\u1ec7t l\u01b0\u1ee3ng k\u1ebf ch\u1ee9a 500 g n\u01b0\u1edbc \u1edf nhi\u1ec7t \u0111\u1ed9 $13{}^\\circ C$ m\u1ed9t mi\u1ebfng kim lo\u1ea1i c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 400 g \u0111\u01b0\u1ee3c nung n\u00f3ng t\u1edbi $100{}^\\circ C$. Nhi\u1ec7t \u0111\u1ed9 khi c\u00f3 c\u00e2n b\u1eb1ng nhi\u1ec7t l\u00e0 $20{}^\\circ C$. T\u00ednh nhi\u1ec7t dung ri\u00eang c\u1ee7a kim lo\u1ea1i. B\u1ecf qua nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0m n\u00f3ng nhi\u1ec7t l\u01b0\u1ee3ng k\u1ebf v\u00e0 kh\u00f4ng kh\u00ed. L\u1ea5y nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 4190 J\/kg.K.","select":["A. C = 658 J\/kg.K.","B. C = 558 J\/kg.K.","C. C = 485 J\/kg.K.","D. C = 458 J\/kg.K."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng mi\u1ebfng kim lo\u1ea1i t\u1ecfa ra:<br\/>${{Q}_{1}}={{m}_{1}}\\times {{C}_{1}}\\times ({{t}_{1}}-{{t}_{2}})=0,4\\times C\\times (100-20)$<br\/>Nhi\u1ec7t l\u01b0\u1ee3ng n\u01b0\u1edbc thu v\u00e0o:<br\/>${{Q}_{2}}={{m}_{2}}\\times C\\times (t-{{t}_{2}})=0,5\\times 4190\\times (20-13)$ <br\/>Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra b\u1eb1ng nhi\u1ec7t l\u01b0\u1ee3ng thu v\u00e0o:<br\/>${{Q}_{thu}}={{Q}_{toa}}$ <br\/>$0,4\\times C\\times (100-20)=0,5\\times 4190\\times (20-13)$ <br\/>\u21d2 C = 458 J\/kg.K<br\/>Kim lo\u1ea1i n\u00e0y l\u00e0 th\u00e9p. <span class='basic_pink'><br\/>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2940},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Ng\u01b0\u1eddi ta th\u1ea3 m\u1ed9t mi\u1ebfng \u0111\u1ed3ng kh\u1ed1i l\u01b0\u1ee3ng 0,5 kg v\u00e0o 500 g n\u01b0\u1edbc. Mi\u1ebfng \u0111\u1ed3ng ngu\u1ed9i \u0111i t\u1eeb $80{}^\\circ C$ xu\u1ed1ng $20{}^\\circ C$. H\u1ecfi n\u01b0\u1edbc n\u00f3ng l\u00ean th\u00eam bao nhi\u00eau \u0111\u1ed9 ?","select":["A. $5,43{}^\\circ C$.","B. $6,43{}^\\circ C$.","C. $7,43{}^\\circ C$.","D. $8,43{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng n\u01b0\u1edbc nh\u1eadn \u0111\u01b0\u1ee3c b\u1eb1ng nhi\u1ec7t l\u01b0\u1ee3ng do mi\u1ebfng \u0111\u1ed3ng t\u1ecfa ra:<br\/>$Q={{m}_{1}}\\times {{C}_{1}}\\times ({{t}_{1}}-{{t}_{2}})=0,5\\times 380\\times (80-20)=11400$J<br\/>N\u01b0\u1edbc n\u00f3ng th\u00eam l\u00ean:<br\/>$\\Delta t=\\dfrac{Q}{{{m}_{2}}\\times {{C}_{2}}}=\\dfrac{11400}{0,5\\times 4200}=5,43{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2941},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"N\u00ea\u0301u hai v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t \u0111\u00f4\u0323\u0323 kha\u0301c nhau \u0111\u0103\u0323t ti\u00ea\u0301p xu\u0301c nhau thi\u0300:","select":["A. Qua\u0301 tri\u0300nh truy\u00ea\u0300n nhi\u00ea\u0323t d\u01b0\u0300ng la\u0323i khi nhi\u00ea\u0323t \u0111\u00f4\u0323 hai v\u00e2\u0323t nh\u01b0 nhau.","B. Qua\u0301 tri\u0300nh truy\u00ea\u0300n nhi\u00ea\u0323t d\u01b0\u0300ng la\u0323i khi nhi\u00ea\u0323t \u0111\u00f4\u0323 m\u00f4\u0323t v\u00e2\u0323t \u0111a\u0323t $0{}^\\circ C$.","C. Qua\u0301 tri\u0300nh truy\u00ea\u0300n nhi\u00ea\u0323t ti\u00ea\u0301p tu\u0323c cho \u0111\u00ea\u0301n khi nhi\u00ea\u0323t n\u0103ng hai v\u00e2\u0323t nh\u01b0 nhau.","D. Qua\u0301 tri\u0300nh truy\u00ea\u0300n nhi\u00ea\u0323t cho \u0111\u00ea\u0301n khi nhi\u00ea\u0323t dung ri\u00eang hai v\u00e2\u0323t nh\u01b0 nhau."],"hint":"","explain":"<span class='basic_left'>N\u00ea\u0301u hai v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t \u0111\u00f4\u0323\u0323 kha\u0301c nhau \u0111\u0103\u0323t ti\u00ea\u0301p xu\u0301c nhau thi\u0300 qua\u0301 tri\u0300nh truy\u00ea\u0300n nhi\u00ea\u0323t d\u01b0\u0300ng la\u0323i khi nhi\u00ea\u0323t \u0111\u00f4\u0323 hai v\u00e2\u0323t nh\u01b0 nhau.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2942},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"\u0110i\u00ea\u0300u na\u0300o sau \u0111\u00e2y \u0111u\u0301ng v\u01a1\u0301i nguy\u00ean ly\u0301 truy\u00ea\u0300n nhi\u00ea\u0323t?","select":["A. Nhi\u00ea\u0323t truy\u00ea\u0300n t\u01b0\u0300 v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t \u0111\u00f4\u0323 th\u00e2\u0301p h\u01a1n sang v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t \u0111\u00f4\u0323 cao h\u01a1n.","B. Nhi\u00ea\u0323t truy\u00ea\u0300n t\u01b0\u0300 v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t \u0111\u00f4\u0323 cao h\u01a1n sang v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t \u0111\u00f4\u0323 th\u00e2\u0301p h\u01a1n.","C. Nhi\u00ea\u0323t truy\u00ea\u0300n t\u01b0\u0300 v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t dung ri\u00eang cao h\u01a1n sang v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t dung ri\u00eang th\u00e2\u0301p h\u01a1n.","D. Nhi\u00ea\u0323t truy\u00ea\u0300n t\u01b0\u0300 v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t dung ri\u00eang th\u00e2\u0301p h\u01a1n sang v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t dung ri\u00eang cao h\u01a1n."],"hint":"","explain":"<span class='basic_left'>Nhi\u00ea\u0323t truy\u00ea\u0300n t\u01b0\u0300 v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t \u0111\u00f4\u0323 cao h\u01a1n sang v\u00e2\u0323t co\u0301 nhi\u00ea\u0323t \u0111\u00f4\u0323 th\u00e2\u0301p h\u01a1n \u0111u\u0301ng v\u01a1\u0301i nguy\u00ean ly\u0301 truy\u00ea\u0300n nhi\u00ea\u0323t. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2943},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"T\u00ednh nhi\u1ec7t \u0111\u1ed9 c\u1ee7a h\u1ed7n h\u1ee3p g\u1ed3m 200 g n\u01b0\u1edbc \u0111ang s\u00f4i v\u00e0o 300 g n\u01b0\u1edbc \u1edf nhi\u1ec7t \u0111\u1ed9 trong ph\u00f2ng th\u00ed nghi\u1ec7m.","select":["A. $t=45{}^\\circ C$.","B. $t=50{}^\\circ C$.","C. $t=55{}^\\circ C$.","D. $t=65{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>Nhi\u00ea\u0323t l\u01b0\u01a1\u0323ng ma\u0300 n\u01b0\u01a1\u0301c no\u0301ng to\u0309a ra l\u00e0:<br\/>${{Q}_{1}}={{Q}_{toa}}={{m}_{1}}\\times {{C}_{{}}}\\times (t-{{t}_{1}})$ <br\/>Nhi\u00ea\u0323t l\u01b0\u01a1\u0323ng ma\u0300 n\u01b0\u01a1\u0301c l\u1ea1nh thu v\u00e0o l\u00e0:<br\/>${{Q}_{2}}={{Q}_{thu}}={{m}_{2}}\\times {{C}_{{}}}\\times ({{t}_{2}}-{{t}_{{}}})$ <br\/>Nhi\u00ea\u0323t l\u01b0\u01a1\u0323ng ma\u0300 n\u01b0\u01a1\u0301c n\u00f3ng t\u1ecfa ra b\u1eb1ng nhi\u1ec7t l\u01b0\u1ee3ng m\u00e0 n\u01b0\u1edbc l\u1ea1nh thu v\u00e0o n\u00ean ta c\u00f3:<br\/>${{Q}_{toa}}={{Q}_{thu}}$ <br\/>${{m}_{1}}\\times C\\times ({{t}_{1}}-t)={{m}_{2}}\\times C\\times \\left( t-{{t}_{2}} \\right)$ <br\/>$\\Rightarrow t=55{}^\\circ C$ <br\/>V\u00e2\u0323y nhi\u00ea\u0323t \u0111\u1ed9 cu\u0309a h\u00f4\u0303n h\u01a1\u0323p n\u01b0\u01a1\u0301c khi c\u00e2n b\u0103\u0300ng nhi\u00ea\u0323t la\u0300 $t=55{}^\\circ C$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2944},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Th\u1ea3 m\u1ed9t th\u1ecfi s\u1eaft c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ${{m}_{1}}=1kg$ \u1edf nhi\u1ec7t \u0111\u1ed9 ${{t}_{1}}=140{}^\\circ C$ v\u00e0o m\u1ed9t x\u00f4 n\u01b0\u1edbc ch\u1ee9a ${{m}_{2}}=4,5kg$ n\u01b0\u1edbc \u1edf ${{t}_{2}}=24{}^\\circ C$. Cho nhi\u1ec7t dung ri\u00eang c\u1ee7a s\u1eaft ${{C}_{1}}=460$J\/kg.K; c\u1ee7a n\u01b0\u1edbc l\u00e0 ${{C}_{2}}=4200$J\/kg.K. H\u1ecfi nhi\u1ec7t \u0111\u1ed9 trong x\u00f4 n\u01b0\u1edbc khi \u0111\u00e3 c\u00f3 c\u00e2n b\u1eb1ng nhi\u1ec7t l\u00e0 bao nhi\u00eau? ","select":["A. $t=26,6{}^\\circ C$.","B. $t=26,4{}^\\circ C$.","C. $t=26,8{}^\\circ C$.","D. M\u1ed9t k\u1ebft qu\u1ea3 kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>G\u1ecdi t l\u00e0 nhi\u1ec7t \u0111\u1ed9 trong x\u00f4 n\u01b0\u1edbc khi \u0111\u00e3 c\u00f3 c\u00e2n b\u1eb1ng nhi\u1ec7t.<br\/>Nhi\u00ea\u0323t l\u01b0\u01a1\u0323ng ma\u0300 s\u1eaft to\u0309a ra l\u00e0:<br\/>${{Q}_{1}}={{Q}_{toa}}={{m}_{1}}\\times C\\times (t-{{t}_{1}})$. <br\/>Nhi\u00ea\u0323t l\u01b0\u01a1\u0323ng ma\u0300 n\u01b0\u01a1\u0301c l\u1ea1nh thu v\u00e0o l\u00e0:<br\/>${{Q}_{2}}={{Q}_{thu}}={{m}_{2}}\\times C\\times ({{t}_{2}}-t)$ <br\/>Nhi\u00ea\u0323t l\u01b0\u01a1\u0323ng ma\u0300 s\u1eaft t\u1ecfa ra b\u1eb1ng nhi\u1ec7t l\u01b0\u1ee3ng m\u00e0 n\u01b0\u1edbc l\u1ea1nh thu v\u00e0o n\u00ean ta c\u00f3:<br\/>${{Q}_{toa}}={{Q}_{thu}}$ <br\/>${{m}_{1}}\\times C\\times ({{t}_{1}}-t)={{m}_{2}}\\times C\\times \\left( t-{{t}_{2}} \\right)$ <br\/>$\\Rightarrow t=26,8{}^\\circ C$<br\/>V\u00e2\u0323y nhi\u00ea\u0323t \u0111\u1ed9 cu\u0309a n\u01b0\u01a1\u0301c khi c\u00e2n b\u0103\u0300ng nhi\u00ea\u0323t la\u0300 .$t=26,8{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2945},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"\u0110i\u1ec1u n\u00e0o sau \u0111\u00e2y x\u1ea3y ra khi cho hai v\u1eadt c\u00f3 nhi\u1ec7t \u0111\u1ed9 kh\u00e1c nhau ti\u1ebfp x\u00fac nhau.","select":["A. Nhi\u1ec7t t\u1ef1 truy\u1ec1n t\u1eeb v\u1eadt c\u00f3 nhi\u1ec7t \u0111\u1ed9 th\u1ea5p h\u01a1n s\u00e1ng v\u1eadt c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n.","B. Nhi\u1ec7t t\u1ef1 truy\u1ec1n t\u1eeb v\u1eadt c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n s\u00e1ng v\u1eadt c\u00f3 nhi\u1ec7t \u0111\u1ed9 th\u1ea5p h\u01a1n.","C. Nhi\u1ec7t truy\u1ec1n t\u1eeb v\u1eadt c\u00f3 nhi\u1ec7t dung ri\u00eang cao h\u01a1n s\u00e1ng v\u1eadt c\u00f3 nhi\u1ec7t dung ri\u00eang th\u1ea5p h\u01a1n.","D. Nhi\u1ec7t truy\u1ec1n t\u1eeb v\u1eadt c\u00f3 nhi\u1ec7t dung ri\u00eang th\u1ea5p h\u01a1n s\u00e1ng v\u1eadt c\u00f3 nhi\u1ec7t dung ri\u00eang cao h\u01a1n."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t t\u1ef1 truy\u1ec1n t\u1eeb v\u1eadt c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n s\u00e1ng v\u1eadt c\u00f3 nhi\u1ec7t \u0111\u1ed9 th\u1ea5p h\u01a1n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2946},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Ng\u01b0\u1eddi ta th\u1ea3 ba mi\u1ebfng \u0111\u1ed3ng, nh\u00f4m, ch\u00ec c\u00f3 c\u00f9ng kh\u1ed1i l\u01b0\u1ee3ng v\u00e0o m\u1ed9t c\u1ed1c n\u01b0\u1edbc n\u00f3ng. H\u00e3y so s\u00e1nh nhi\u1ec7t \u0111\u1ed9 cu\u1ed1i c\u00f9ng c\u1ee7a ba mi\u1ebfng kim lo\u1ea1i tr\u00ean b\u1eb1ng c\u00e1ch ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang c\u00e1c c\u00e2u tr\u1ea3 l\u1eddi sau \u0111\u00e2y:","select":["A. Nhi\u1ec7t \u0111\u1ed9 c\u1ee7a mi\u1ebfng nh\u00f4m cao nh\u1ea5t, r\u1ed3i \u0111\u1ebfn mi\u1ebfng \u0111\u1ed3ng, mi\u1ebfng ch\u00ec.","B. Nhi\u1ec7t \u0111\u1ed9 c\u1ee7a mi\u1ebfng \u0111\u1ed3ng cao nh\u1ea5t, r\u1ed3i \u0111\u1ebfn mi\u1ebfng nh\u00f4m, mi\u1ebfng ch\u00ec.","C. Nhi\u1ec7t \u0111\u1ed9 c\u1ee7a ba mi\u1ebfng b\u1eb1ng nhau.","D. Nhi\u1ec7t \u0111\u1ed9 c\u1ee7a mi\u1ebfng ch\u00ec cao nh\u1ea5t, r\u1ed3i \u0111\u1ebfn mi\u1ebfng \u0111\u1ed3ng, mi\u1ebfng nh\u00f4m."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t s\u1ebd \u0111\u01b0\u1ee3c truy\u1ec1n t\u1eeb v\u1eadt n\u00f3ng h\u01a1n sang v\u1eadt l\u1ea1nh h\u01a1n cho \u0111\u1ebfn khi c\u00e1c v\u1eadt c\u00f3 nhi\u1ec7t \u0111\u1ed9 b\u1eb1ng nhau.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2947},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Th\u1ea3 m\u1ed9t qu\u1ea3 c\u1ea7u nh\u00f4m c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 0,2kg \u0111\u00e3 \u0111\u01b0\u1ee3c nung n\u00f3ng t\u1edbi $100{}^\\circ C$ v\u00e0o m\u1ed9t c\u1ed1c n\u01b0\u1edbc \u1edf $20{}^\\circ C$. Sau m\u1ed9t th\u1eddi gian, nhi\u1ec7t \u0111\u1ed9 c\u1ee7a qu\u1ea3 c\u1ea7u v\u00e0 n\u01b0\u1edbc \u0111\u1ec1u b\u1eb1ng $27{}^\\circ C$. Coi nh\u01b0 ch\u1ec9 c\u00f3 m\u1ed9t qu\u1ea3 c\u1ea7u v\u00e0 n\u01b0\u1edbc trao \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9 v\u1edbi nhau. Bi\u1ebft nhi\u1ec7t dung ri\u00eang c\u1ee7a nh\u00f4m v\u00e0 n\u01b0\u1edbc l\u00e0: ${{C}_{1}}=880J\/kg.K$ v\u00e0 ${{C}_{2}}=4200J\/kg.K$. Nhi\u1ec7t l\u01b0\u1ee3ng do qu\u1ea3 c\u1ea7u t\u1ecfa ra c\u00f3 th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb n\u00e0o trong c\u00e1c gi\u00e1 tr\u1ecb sau:","select":["A. Q = 128480J.","B. Q = 12848J.","C. Q = 12848kJ.","D. Q = 128480kJ."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng do qu\u1ea3 c\u1ea7u t\u1ecfa ra:<br\/> ${{Q}_{toa}}=m\\times C\\times {{\\Delta }_{t}}=0,2\\times (880)\\times (100-27)=12848J$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2948},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"M\u1ed9t h\u1ecdc sinh th\u1ea3 300g ch\u00ec \u1edf $100{}^\\circ C$ v\u00e0o 250g n\u01b0\u1edbc \u1edf $58,5{}^\\circ C$l\u00e0m cho n\u01b0\u1edbc n\u00f3ng t\u1edbi $60{}^\\circ C$. Nhi\u1ec7t l\u01b0\u1ee3ng n\u01b0\u1edbc thu v\u00e0o l\u00e0 bao nhi\u00eau? ${{c}_{nc}}=4200J\/kg.K$. Ch\u1ecdn k\u1ebft qu\u1ea3 \u0111\u00fang trong c\u00e1c k\u1ebft qu\u1ea3 sau:","select":["A. Q = 1575J.","B. Q = 157,5J.","C. Q = 157,5kJ.","D. Q = 1575kJ."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng n\u01b0\u1edbc thu v\u00e0o l\u00e0:<br\/> $Q=m\\times C\\times {{\\Delta }_{t}}=0,25\\times 4200\\times (60-58,5)=1575J$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2949},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"M\u1ed9t nhi\u1ec7t l\u01b0\u1ee3ng k\u1ebf ch\u1ee9a 12l\u00edt n\u01b0\u1edbc \u1edf $15{}^\\circ C$. N\u1ebfu b\u1ecf v\u00e0o nhi\u1ec7t l\u01b0\u1ee3ng k\u1ebf m\u1ed9t qu\u1ea3 c\u00e2n b\u1eb1ng \u0111\u1ed3ng thau kh\u1ed1i l\u01b0\u1ee3ng 500g \u0111\u00e3 \u0111\u01b0\u1ee3c nung n\u00f3ng t\u1edbi $100{}^\\circ C$. H\u1ecfi n\u01b0\u1edbc n\u00f3ng l\u00ean th\u00eam bao nhi\u00eau \u0111\u1ed9? L\u1ea5y nhi\u1ec7t dung ri\u00eang c\u1ee7a \u0111\u1ed3ng thau l\u00e0 368J\/kg.K, c\u1ee7a n\u01b0\u1edbc l\u00e0 4186J\/kg.K. B\u1ecf qua nhi\u1ec7t l\u01b0\u1ee3ng truy\u1ec1n nhi\u1ec7t cho nhi\u1ec7t l\u01b0\u1ee3ng k\u1ebf ra ngo\u00e0i.","select":["A. $t=15,3{}^\\circ C$.","B. $t=17,3{}^\\circ C$.","C. $t=14,3{}^\\circ C$.","D. $t=16,3{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: ${{Q}_{toa}}={{Q}_{thu}}$ <br\/>Hay: ${{m}_{1}}\\times {{C}_{1}}\\times \\Delta {{t}_{1}}={{m}_{2}}\\times {{C}_{2}}\\times \\Delta {{t}_{2}}$<br\/>Thay s\u1ed1: $12\\times (t-15)\\times 4186=0,5\\times (100-t)\\times 368$ <br\/>V\u1eady $t=15,3{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2950},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Th\u1ea3 m\u1ed9t qu\u1ea3 c\u1ea7u nh\u00f4m c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 0,2kg \u0111\u00e3 \u0111\u01b0\u1ee3c nung n\u00f3ng t\u1edbi $100{}^\\circ C$ v\u00e0o m\u1ed9t c\u1ed1c n\u01b0\u1edbc \u1edf $20{}^\\circ C$. Sau m\u1ed9t th\u1eddi gian, nhi\u1ec7t \u0111\u1ed9 c\u1ee7a qu\u1ea3 c\u1ea7u v\u00e0 n\u01b0\u1edbc \u0111\u1ec1u b\u1eb1ng $27{}^\\circ C$. Coi nh\u01b0 ch\u1ec9 c\u00f3 m\u1ed9t qu\u1ea3 c\u1ea7u v\u00e0 n\u01b0\u1edbc trao \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9 v\u1edbi nhau. Bi\u1ebft nhi\u1ec7t dung ri\u00eang c\u1ee7a nh\u00f4m v\u00e0 n\u01b0\u1edbc l\u00e0: ${{C}_{1}}=880J\/kg.K$ v\u00e0 ${{C}_{2}}=4200J\/kg.K$. Kh\u1ed1i l\u01b0\u1ee3ng n\u01b0\u1edbc trong c\u1ed1c l\u00e0 bao nhi\u00eau? ","select":["A. m = 0,46kg.","B. m = 0,44kg.","C. m = 0,48kg.","D. m = 0,50kg."],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3: ${{Q}_{toa}}={{Q}_{thu}}$<br\/>Hay: ${{m}_{1}}\\times {{C}_{1}}\\times \\Delta {{t}_{1}}={{m}_{2}}\\times {{C}_{2}}\\times \\Delta {{t}_{2}}$<br\/>Thay s\u1ed1: $0,2\\times (100-27)\\times 880={{m}_{2}}\\times (27-20)\\times 4200$ <br\/>V\u1eady: ${{m}_{2}}=0,44kg$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2951},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Th\u1ea3 m\u1ed9t th\u1ecfi \u0111\u1ed3ng n\u1eb7ng 0,6kg \u1edf nhi\u1ec7t \u0111\u1ed9 $85{}^\\circ C$ v\u00e0o 0,35kg n\u01b0\u1edbc \u1edf nhi\u1ec7t \u0111\u1ed9 $20{}^\\circ C$. Cho nhi\u1ec7t dung ri\u00eang c\u1ee7a \u0111\u1ed3ng ${{C}_{1}}=380$J\/kg.K, c\u1ee7a n\u01b0\u1edbc ${{C}_{2}}=4200$J\/kg.K. Nhi\u1ec7t \u0111\u1ed9 khi c\u00f3 s\u1ef1 c\u00e2n b\u1eb1ng nhi\u1ec7t c\u00f3 th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb n\u00e0o trong c\u00e1c gi\u00e1 tr\u1ecb sau:","select":["A. $t=28,7{}^\\circ C$.","B. $t=28,5{}^\\circ C$.","C. $t=28,3{}^\\circ C$.","D. $t=28,1{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t \u0111\u1ed9 khi c\u00e2n b\u1eb1ng l\u00e0 t.<br\/>Ta c\u00f3: ${{Q}_{toa}}={{Q}_{thu}}$<br\/>Hay: ${{m}_{1}}\\times {{C}_{1}}\\times \\Delta {{t}_{1}}={{m}_{2}}\\times {{C}_{2}}\\times \\Delta {{t}_{2}}$<br\/>Thay s\u1ed1: $0,6\\times (85-t)\\times 380=0,35\\times (t-20)\\times 4200$ <br\/>V\u1eady: $t=28,7{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2952},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"C\u00f9ng \u0111\u01b0\u1ee3c cung c\u00e2p nhi\u1ec7t l\u01b0\u1ee3ng nh\u01b0 nhau, trong c\u00e1c v\u1eadt c\u00f9ng kh\u1ed1i l\u01b0\u1ee3ng l\u00e0m b\u1eb1ng c\u00e1c ch\u1ea5t sau \u0111\u00e2y: n\u01b0\u1edbc, \u0111\u1ed3ng, ch\u00ec, nh\u00f4m v\u1eadt n\u00e0o t\u0103ng nhi\u1ec7t \u0111\u1ed9 nhi\u1ec1u h\u01a1n? Ch\u1ecdn th\u1ee9 t\u1ef1 \u0111\u00fang t\u1eeb nh\u1ecf \u0111\u1ebfn l\u1edbn? ","select":["A. N\u01b0\u1edbc - nh\u00f4m - \u0111\u1ed3ng - ch\u00ec.","B. N\u01b0\u1edbc - \u0111\u1ed3ng - nh\u00f4m - ch\u00ec.","C. N\u01b0\u1edbc - ch\u00ec - nh\u00f4m - \u0111\u1ed3ng.","D. Nh\u00f4m - n\u01b0\u1edbc - \u0111\u1ed3ng - ch\u00ec."],"hint":"","explain":"<span class='basic_left'>Ch\u1ea5t c\u00f3 nhi\u1ec7t dung ri\u00eang c\u00e0ng l\u1edbn th\u00ec kh\u1ea3 n\u0103ng t\u0103ng nhi\u1ec7t \u0111\u1ed9 c\u00e0ng th\u1ea5p khi \u0111\u01b0\u1ee3c nh\u1eadn nhi\u1ec7t nh\u01b0 nhau. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2953},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Pha m\u1ed9t l\u01b0\u1ee3ng n\u01b0\u1edbc \u1edf $80{}^\\circ C$ v\u00e0o b\u00ecnh ch\u01b0a 9 l\u00edt n\u01b0\u1edbc \u0111ang c\u00f3 nhi\u1ec7t \u0111\u1ed9 $22{}^\\circ C$. Nhi\u1ec7t \u0111\u1ed9 cu\u1ed1i c\u00f9ng khi c\u00f3 s\u1ef1 c\u00e2n b\u1eb1ng nhi\u1ec7t l\u00e0 $36{}^\\circ C$. H\u1ecfi l\u01b0\u1ee3ng n\u01b0\u1edbc \u0111\u00e3 pha th\u00eam v\u00e0o b\u00ecnh l\u00e0 bao nhi\u00eau? Ch\u1ecdn k\u1ebft qu\u1ea3 \u0111\u00fang trong c\u00e1c k\u1ebft qu\u1ea3 sau:","select":["A. m = 2,86kg.","B. m = 2,86g.","C. m = 28,6kg.","D. M\u1ed9t gi\u00e1 tr\u1ecb kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>Kh\u1ed1i l\u01b0\u1ee3ng n\u01b0\u1edbc pha th\u00eam l\u00e0 m.<br\/>Ta c\u00f3: ${{Q}_{toa}}={{Q}_{thu}}$<br\/>Hay ${{m}_{1}}\\times {{C}_{1}}\\times \\Delta {{t}_{1}}={{m}_{2}}\\times {{C}_{2}}\\times \\Delta {{t}_{2}}$<br\/>Thay s\u1ed1: $m\\times (80-36)\\times c=9\\times (36-26)\\times c$ <br\/>V\u1eady: $m=2,86kg$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2954},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Ph\u01b0\u01a1ng tr\u00ecnh n\u00e0o sau \u0111\u00e2y l\u00e0 ph\u01b0\u01a1ng tr\u00ecnh c\u00e2n b\u1eb1ng nhi\u1ec7t?","select":["A. ${{Q}_{toa}}+{{Q}_{thu}}=0$.","B. ${{Q}_{toa}}={{Q}_{thu}}$.","C. ${{Q}_{toa}}\\times {{Q}_{thu}}=0$.","D. $\\dfrac{{{Q}_{toa}}}{{{Q}_{thu}}}=0$ ."],"hint":"","explain":"<span class='basic_left'>Ph\u01b0\u01a1ng tr\u00ecnh c\u00e2n b\u1eb1ng nhi\u1ec7t l\u00e0 ${{Q}_{toa}}={{Q}_{thu}}$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2955},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Th\u1ea3 m\u1ed9t mi\u1ebfng th\u00e9p n\u1eb7ng 2kg c\u00f3 nhi\u1ec7t \u0111\u1ed9 $345{}^\\circ C$ v\u00e0o m\u1ed9t b\u00ecnh \u0111\u1ef1ng 3 l\u00edt n\u01b0\u1edbc. Sau khi c\u00e2n b\u1eb1ng nhi\u1ec7t \u0111\u1ed9 cu\u1ed1i c\u00f9ng l\u00e0 $30{}^\\circ C$. B\u1ecf qua s\u1ef1 t\u1ecfa nhi\u1ec7t ra m\u00f4i tr\u01b0\u1eddng. Bi\u1ebft nhi\u1ec7t dung ri\u00eang c\u1ee7a th\u00e9p, n\u01b0\u1edbc l\u1ea7n l\u01b0\u1ee3t l\u00e0 $460J\/kg.K$, $4200J\/kg.K$. Nhi\u1ec7t \u0111\u1ed9 ban \u0111\u1ea7u c\u1ee7a n\u01b0\u1edbc l\u00e0?","select":["A. $7{}^\\circ C$.","B. $17{}^\\circ C$.","C. $27{}^\\circ C$.","D. $37{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>G\u1ecdi nhi\u1ec7t \u0111\u1ed9 ban \u0111\u1ea7u c\u1ee7a n\u01b0\u1edbc l\u00e0 t. <br\/>${{Q}_{toa}}={{Q}_{thu}}$<br\/>${{m}_{1}}\\times {{C}_{1}}\\times \\Delta {{t}_{1}}={{m}_{2}}\\times {{C}_{2}}\\times \\Delta {{t}_{2}}$<br\/>Ta c\u00f3: $2\\times (345-30)\\times 460=3\\times (30-t)\\times 4200$<br\/>V\u1eady: $t=7{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2956},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Ng\u01b0\u1eddi ta mu\u1ed1n pha n\u01b0\u1edbc t\u1eafm v\u1edbi nhi\u1ec7t \u0111\u1ed9 $38{}^\\circ C$. H\u1ecfi ph\u1ea3i pha th\u00eam bao nhi\u00eau l\u00edt n\u01b0\u1edbc s\u00f4i v\u00e0o 15 l\u00edt n\u01b0\u1edbc l\u1ea1nh \u1edf $24{}^\\circ C$.","select":["A. 2,5 l\u00edt.","B. 3,38 l\u00edt.","C. 4,2 l\u00edt.","D. 5 l\u00edt."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng m\u00e0 n\u01b0\u1edbc s\u00f4i t\u1ecfa ra<br\/>${{Q}_{1}}={{m}_{1}}\\times C\\times ({{t}_{1}}-t)={{m}_{1}}\\times C\\times (100-38)$ <br\/>Nhi\u1ec7t l\u01b0\u1ee3ng m\u00e0 n\u01b0\u1edbc l\u1ea1nh nh\u1eadn v\u00e0o<br\/>${{Q}_{2}}={{m}_{2}}\\times C\\times ({{t}_{{}}}-{{t}_{2}})=15\\times C\\times (38-24)$<br\/>ADPT c\u00e2n b\u1eb1ng nhi\u1ec7t <br\/>${{Q}_{1}}={{Q}_{2}}$ <br\/>$\\Rightarrow {{m}_{1}}=3,38kg$ <br\/>Suy ra c\u1ea7n 3,38 l\u00edt n\u01b0\u1edbc s\u00f4i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2957},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"\u0110\u1ed5 5 l\u00edt n\u01b0\u1edbc \u1edf $20{}^\\circ C$ v\u00e0o 3 l\u00edt n\u01b0\u1edbc \u1edf $45{}^\\circ C$. Nhi\u1ec7t \u0111\u1ed9 khi c\u00e2n b\u1eb1ng l\u00e0?","select":["A. $2,94{}^\\circ C$.","B. $293,75{}^\\circ C$.","C. $29,36{}^\\circ C$.","D. $29,4{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng thu v\u00e0o c\u1ee7a 5 l\u00edt n\u01b0\u1edbc l\u00e0:<br\/>${{Q}_{1}}={{m}_{1}}\\times C\\times ({{t}_{{}}}-{{t}_{1}})=5\\times C\\times (t-20)$ <br\/>Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra c\u1ee7a 3 l\u00edt n\u01b0\u1edbc l\u00e0:<br\/>${{Q}_{2}}={{m}_{2}}\\times C\\times ({{t}_{2}}-{{t}_{t}})=3\\times C\\times \\left( 45-t \\right)$<br\/>ADPTCBN:<br\/>${{Q}_{1}}={{Q}_{2}}$ <br\/>$\\Rightarrow 5\\times C\\times \\left( t-20 \\right)=3\\times C\\times \\left( 45-t \\right)$ <br\/>$\\Rightarrow t=29,4{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2958},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Th\u1ea3 m\u1ed9t qu\u1ea3 c\u1ea7u b\u1eb1ng nh\u00f4m n\u1eb7ng 0,15 kg \u0111\u01b0\u1ee3c \u0111un n\u00f3ng t\u1edbi $100{}^\\circ C$ v\u00e0o m\u1ed9t c\u1ed1c n\u01b0\u1edbc \u1edf $20{}^\\circ C$. Sau m\u1ed9t th\u1eddi gian nhi\u1ec7t \u0111\u1ed9 c\u1ee7a qu\u1ea3 c\u1ea7u v\u00e0 n\u01b0\u1edbc \u0111\u1ec1u b\u1eb1ng $25{}^\\circ C$. Coi qu\u1ea3 c\u1ea7u v\u00e0 n\u01b0\u1edbc ch\u1ec9 truy\u1ec1n nhi\u1ec7t cho nhau. Bi\u1ebft nhi\u1ec7t dung ri\u00eang c\u1ee7a nh\u00f4m v\u00e0 n\u01b0\u1edbc l\u1ea7n l\u01b0\u1ee3t l\u00e0 $880J\/kg.K$, $4200J\/kg.K$. Kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a n\u01b0\u1edbc l\u00e0?","select":["A. 0,47kg.","B. 0,47g.","C. 2kg.","D. 2g."],"hint":"","explain":"<span class='basic_left'>G\u1ecdi m l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng n\u01b0\u1edbc.<br\/>${{Q}_{toa}}={{Q}_{thu}}$<br\/>${{m}_{1}}\\times {{C}_{1}}\\times \\Delta {{t}_{1}}={{m}_{2}}\\times {{C}_{2}}\\times \\Delta {{t}_{2}}$<br\/>Thay s\u1ed1 ta c\u00f3: $0,15\\times (100-25)\\times 880=m\\times (25-20)\\times 4200$ <br\/>V\u1eady $m=0,47kg$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2959}],"lesson":{"save":0,"level":2}}