Tốc độ phản ứng và chất xúc tác

Home Lớp 8 Khoa học tự nhiên 8 - sách Kết nối tri thức Bài 7: Tốc độ phản ứng và chất xúc tácBài tập trung bình

{"common":{"save":0,"post_id":"8550","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7728","post_id":"8550","mon_id":"1159539","chapter_id":"1159541","question":"Cho cân b\u1eb1ng sau trong bình kín. 2NO$_{2}$<\/span> (màu nâu \u0111\u1ecf) \u21cc N$_{2}$<\/span>O$_{4}$<\/span> (không màu). Bi\u1ebft khi h\u1ea1 nhi\u1ec7t \u0111\u1ed9 c\u1ee7a bình thì màu nâu \u0111\u1ecf nh\u1ea1t d\u1ea7n. Ph\u1ea3n \u1ee9ng thu\u1eadn có:<\/p>","options":["A. ΔH < 0, ph\u1ea3n \u1ee9ng to\u1ea3 nhi\u1ec7t","B. ΔH > 0, ph\u1ea3n \u1ee9ng to\u1ea3 nhi\u1ec7t","C. ΔH < 0, ph\u1ea3n \u1ee9ng thu nhi\u1ec7t","D. ΔH > 0, ph\u1ea3n \u1ee9ng thu nhi\u1ec7t"],"correct":"1","level":"2","hint":"Hãy xem xét cách cân b\u1eb1ng ph\u1ea3n \u1ee9ng thay \u0111\u1ed5i khi nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i. N\u1ebfu khi h\u1ea1 nhi\u1ec7t \u0111\u1ed9, màu nâu \u0111\u1ecf nh\u1ea1t d\u1ea7n, \u0111i\u1ec1u \u0111ó cho th\u1ea5y ph\u1ea3n \u1ee9ng \u0111i theo h\u01b0\u1edbng nào.<\/p>","answer":"\u0110áp án \u0111úng: A. ΔH < 0, ph\u1ea3n \u1ee9ng to\u1ea3 nhi\u1ec7t<\/strong><\/p>Khi nhi\u1ec7t \u0111\u1ed9 gi\u1ea3m và màu nâu \u0111\u1ecf nh\u1ea1t d\u1ea7n, ph\u1ea3n \u1ee9ng d\u1ecbch chuy\u1ec3n sang ph\u1ea3i, t\u1ee9c là t\u1ea1o thành N2O4. \u0110i\u1ec1u này cho th\u1ea5y ph\u1ea3n \u1ee9ng thu\u1eadn là ph\u1ea3n \u1ee9ng to\u1ea3 nhi\u1ec7t (ΔH < 0). Khi gi\u1ea3m nhi\u1ec7t \u0111\u1ed9, ph\u1ea3n \u1ee9ng s\u1ebd d\u1ecbch chuy\u1ec3n theo chi\u1ec1u to\u1ea3 nhi\u1ec7t \u0111\u1ec3 bù \u0111\u1eafp s\u1ef1 m\u1ea5t nhi\u1ec7t.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"139","test":"0","date":"2025-02-27 09:41:42","option_type":"txt","len":2},{"id":"7729","post_id":"8550","mon_id":"1159539","chapter_id":"1159541","question":"Dùng không khí nén th\u1ed5i vào lò cao \u0111\u1ec3 \u0111\u1ed1t cháy than c\u1ed1c (trong s\u1ea3n xu\u1ea5t gang), y\u1ebfu t\u1ed1 nào \u0111ã \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 làm t\u0103ng t\u1ed1c \u0111\u1ed9 ph\u1ea3n \u1ee9ng?<\/p>","options":["A. Nhi\u1ec7t \u0111\u1ed9, áp su\u1ea5t.","B. di\u1ec7n tích ti\u1ebfp xúc.","C. N\u1ed3ng \u0111\u1ed9.","D. xúc tác."],"correct":"3","level":"2","hint":"Khi t\u0103ng n\u1ed3ng \u0111\u1ed9 c\u1ee7a các ch\u1ea5t tham gia ph\u1ea3n \u1ee9ng, s\u1ed1 l\u01b0\u1ee3ng phân t\u1eed va ch\u1ea1m s\u1ebd nhi\u1ec1u h\u01a1n, t\u1eeb \u0111ó t\u0103ng t\u1ed1c \u0111\u1ed9 ph\u1ea3n \u1ee9ng.<\/p>","answer":"\u0110áp án \u0111úng: C. N\u1ed3ng \u0111\u1ed9.<\/strong><\/p>Vi\u1ec7c s\u1eed d\u1ee5ng không khí nén làm t\u0103ng n\u1ed3ng \u0111\u1ed9 oxy trong lò cao, giúp t\u0103ng t\u1ed1c \u0111\u1ed9 ph\u1ea3n \u1ee9ng \u0111\u1ed1t cháy than c\u1ed1c, vì n\u1ed3ng \u0111\u1ed9 oxy cao h\u01a1n s\u1ebd thúc \u0111\u1ea9y ph\u1ea3n \u1ee9ng nhanh h\u01a1n.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"139","test":"0","date":"2025-02-27 09:43:14","option_type":"txt","len":2},{"id":"7730","post_id":"8550","mon_id":"1159539","chapter_id":"1159541","question":"T\u1ed1c \u0111\u1ed9 ph\u1ea3n \u1ee9ng không ph\u1ee5 thu\u1ed9c y\u1ebfu t\u1ed1 nào sau \u0111ây?<\/p>","options":["A. Th\u1eddi gian x\u1ea3y ra ph\u1ea3n \u1ee9ng.","B. B\u1ec1 m\u1eb7t ti\u1ebfp xúc gi\u1eefa các ch\u1ea5t ph\u1ea3n \u1ee9ng.","C. N\u1ed3ng \u0111\u1ed9 các ch\u1ea5t tham gia ph\u1ea3n \u1ee9ng.","D. Ch\u1ea5t xúc tác."],"correct":"1","level":"2","hint":"Xem xét y\u1ebfu t\u1ed1 nào không \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 ph\u1ea3n \u1ee9ng, trong khi các y\u1ebfu t\u1ed1 khác \u0111\u1ec1u có th\u1ec3 làm thay \u0111\u1ed5i nó.<\/p>","answer":"\u0110áp án \u0111úng: A. Th\u1eddi gian x\u1ea3y ra ph\u1ea3n \u1ee9ng.<\/strong><\/p>T\u1ed1c \u0111\u1ed9 ph\u1ea3n \u1ee9ng ph\u1ee5 thu\u1ed9c vào các y\u1ebfu t\u1ed1 nh\u01b0 b\u1ec1 m\u1eb7t ti\u1ebfp xúc, n\u1ed3ng \u0111\u1ed9 ch\u1ea5t tham gia và ch\u1ea5t xúc tác, nh\u01b0ng th\u1eddi gian x\u1ea3y ra ph\u1ea3n \u1ee9ng không tr\u1ef1c ti\u1ebfp \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 ph\u1ea3n \u1ee9ng.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"139","test":"0","date":"2025-02-27 09:44:42","option_type":"txt","len":3}]}