เรื่องจลนศาสตร์เคมี

ข้อสอบเรื่องจลนศาสตร์เคมี 1) ปฏิกิริยาระหว่าง diethylhydrazine และ iodine เกิดปฏิกิริยาดังนี้ (C2H5)2(NH)2 (l) ) + I2 (aq) → (C₂H5)2(N₂ (l) ) + 2HI (aq) เมื่อศึกษาอัตราการเกิดปฏิกิริยาของปฏิกิริยานี้โดยศึกษาการจางลงของสีม่วงของสาร I ที่อุณหภูมิ 25 °C การศึกษาดังแสดงในตารางดังนี้ (6 คะแนน) การทดลองครั้งที [(C2H5)2(NH)2] M [12], M อัตราการเกิดปฏิกิริยา, Ms 1 1 0.150 0.250 1.08 x 10 4 2 0.150 0.362 1.56 x 10 4 3 0.200 0.400 2.30 x 10 4 4 0.300 0.400 3.44 x 10 4 1.1) จงคำนวณหาอันดับของปฏิกิริยา เมื่อเทียบกับ (C2Hs) (NH), และเมื่อเทียบกับ 12 และคำนวณหา อันดับรวมของปฏิกิริยา (overall order) 1.2) จากอันดับของปฏิกิริยาที่คำนวณได้ จงเขียนกฎอัตรา (rate law) ของปฏิกิริยานี้ 1.3) จงคำนวณค่าคงที่อัตราของปฏิกิริยา (k : rate constant) ที่อุณหภูมิ 25 °C พร้อมทั้งระบุหน่วย = = 1.4) จากการคำนวณข้อ 1.1 - 1.3 ถ้าทำการทดลองโดยใช้ [(C2H5) (NH)2] มีค่า = 0.500 M และ _ [I2] = 0.900 M จงคำนวณหาอัตราการเกิดปฏิกิริยานี้ ซึ่งได้ข้อมูล

พี่ๆคนไหนสามารถทำข้อนี้ได้บ้างคะ ช่วยหน่อยค่ะ

EXAMPLE 9.1 Water Treatment Facility #3 Case The situation with the location and construction of the new WTF3 and associated transmission mains described in the chapter's introduction has reached a serious level because of recent questions posed by some city council members and citizen groups. Before going public to the city council with the analysis performed last year, the director of Allen Water Utilities has asked an engineering management consultant to review it and determine if it was an acceptable analysis and correct economic decision, then and now. The lead consultant, Joel Whiterson, took engineering economy as a part of his B.S. education and has previously worked on economic studies in the government sector, but never as the lead person. Within the first hour of checking background notes, Joel found several initial estimates (shown below) from last year for expected consequences if WTF3 were built. He realized that no viewpoint of the study was defined, and, in fact, the estimates were never classified as costs, benefits, or disbenefits. He did determine that disbenefits were considered at some point in the analysis, though the estimates for them are very sketchy. Joel defined two viewpoints: a citizen of Allen and the Allen Water Utilities budget. He wants to identify each of the estimates as a cost, benefit, or disbenefit from each viewpoint. Please help with this classification. Economic Dimension 1. Cost of water: 10% annual increase to Allen households 2. Bonds: Annual debt service at 3% per year on $540 million 3. Use of land: Payment to Parks and Recreation for shaft sites and construction areas 4. Property values: Loss in value, sales price, and property taxes 5. Water sales: Increases in sales to surrounding communities 6. M&O: Annual maintenance and operations costs 7. Peak load purchases: Savings in purchases of treated water from secondary sources Monetary Estimate Average of $29.7 million (years 1-5, steady thereafter) $16.2 million (years 1-19); $516.2 million (year 20) $300,000 (years 1-4) $4 million (years 1-5) $5 million (year 4) plus 5% per year (years 5-20) $300,000 plus 4% per year increase (years 1-20) $500,000 (years 5-20)

ช่วยแสดงวิธีทำอย่างละเอียดได้ไหม

Dimensional Analysis Practice 1. 261 g →> kg 2. 3 days seconds 3. 9,474 mm cm 4. 0.73 KL →L 5. 5.93 cm³ → 3 m³ 3 6. 498.82 cg mg minutes 7.1 year 8. 4.65 km → m 9. 22.4 kg/L to kg/mL 10. 0.74 Kcal/min to cal/sec 11. 1.42 g/cm² to mg/mm² 12. 9.81 m/s² to ft/s² 13. 8.41 g/mL to Kg/L 14. 8.24 g/cm² to mg/mm² 15. The total amount of fresh water on earth is estimated to be 3.73 x 108 km³. What is this volume in cubic meters?

ทำเป็นมายแมพให้มันเชื่อมกันของโปรตีน ลิปิด คาร์โบไฮเดรต

Stage 1 Stage 2 CH3 CH2 CH2 BOxidation 8 Acetyl-CoA CH2 CH2 CH2 CH2 no CH2 CH2 CH2 CH2 CH2 CH2 CH2 CH2 0=0 Stage 3 Citric acid cycle 64e 16CO2 NADH, FADH2 er Respiratory (electron-transfer) chain ADP + Pi ATP 2H+ + +02 H₂O

วิชา PRE380

2. A chemical company is considering options for eliminating harmless chemical sludge from the following 2 options. (1) Prepare the site for landfilling in the factory. This option requires the initial investment for purchasing the essential equipment 130,000 Baht. Each year there will also be a cost of landfill operation 95,000 baht per year. At the end of its service life of 3 years, the equipment used within the landfill site will have a salvage value of 20,000 baht. (2) Hire a chemical sludge removal contractor to remove sludge. The contract term must be 6 years. The cost of contract to be paid to the contractor are 110,000 Baht a year in year 1-2; 115,000 Baht in year 3; 120,000 Baht in year 4; 125,000 Baht in year 5; and 130,000 Baht in year 6. a) (13 marks) If the company finances the money for this project by borrowing from a bank in which the bank charges interest on loans at the rate of 3.86% per 6 months, compounded every month. Which option should this chemical company choose? b) (5 marks) The company executives believe that the option of establishing a landfilling site within the factory seems to be a more sustainable alternative for the company. If the selection in question a) above did not select the landfilling site option, please suggest how much the initial investment for purchasing the equipment should cost so that the landfill option would be selected (assume the same salvage value of the equipment)?

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Complete the text using the correct form of the verb in brackets. (learn) was inspired 2) Maria is an advocate for promoting cultural exchange. She enjoys 1) about diverse traditions and is determined to make a positive impact. Last summer, she (volunteer) at an international festival, an event dedicated to celebrating global cultures. She was eager 3) (meet) people from different backgrounds and also hoped to be part of the dance performances, a chance for her to showcase her love for dance. During the festival, Maria's main role was 4) prepo joy in 5) (assist) the performers. She found V.tube (ensure) (witness) (help) them prepare the stage. Her goal was 6) a seamless and enjoyable event for all attendees. Maria was excited 7) ad. the audience's reactions and applause. After the festival, Maria was motivated 8) events. She aspires 9) dreams of 10) (continue) her involvement in cultural (organize) her own cultural festival one day. She also (foster) understanding of diverse global cultures.

เป็นวิชาเกี่ยวกับพันธุศาสตร์ค่ะ พยายามหาแล้ว หาไม่เจอ ช่วยด้วยค่ะ

06:15 Principles of genetics อธิบาย gene expression ชนิด inducible และ depressible

Present Perfect Continuous

9 Present Perfect Continuous (I've been cooking) 3 Here are some more examples: 1 We form the Present Perfect Continuous in this way: POSITIVE I/you/we/they have/'ve He/she/it been cooking. has/'s S NEGATIVE 1/you/we/they haven't He/she/it hasn't QUESTIONS Have 1/you/we/they he/she/it Has been cooking. }been cooking? (For details about -ing forms see Table C, on page 95.) 2 We use the Present Perfect Continuous for an action or situation that began in the past and continues until now: You're late! I've been waiting for you. We often use for and since with the Present Perfect Continuous. We use for with a period of time, and since with a point in time: I've been waiting for you for two hours. I've been waiting for you since 6 o'clock. PAST NOW Julia has been talking on the phone for an hour. (= She started talking on the phone an hour ago and she is still talking.) You've been sitting there since I o'clock. (= You started sitting there at one o'clock and you are still sitting there.) 4 We use the Present Perfect Continuous for actions that are done many times in a period. of time from the past until now: She's been having driving lessons for a couple of months. (= She started a couple. of months ago; she is still having lessons.) I've been playing tennis since I was a small child. 5 We can use How long with the Present Perfect Continuous: How long have you been living here? Practice A Write a sentence for each of the following situations, using the Present Perfect Continuous and for or since. 0 She started her course a month ago and she is still doing it. She has been doing her course for a month. 0 I started reading this novel last weekend and I'm still reading it. I have been reading this novel since last weekend. 1 It started raining at 3 o'clock and it is still raining. 2 He started playing chess when he was 10 and he still plays it. 3 I started work at 8 o'clock and I'm still working. 4 Helen started looking for another job two months ago and she's still looking. 5 We arrived here two hours ago and we're still waiting. B Put for or since into the gaps. 0 I've been working in this office since 1 Have you been doing this course 2 I've been driving this car 3 She has been planning the party 4 George has been telling the same stories 5 We've been waiting for a reply 6 What have you been doing. 7 You've been writing that letter 8 He's been feeling ill phone to someone all afternoon. a few days. C Complete these dialogues by putting the verbs in brackets ( ) into the Present Perfect Continuous. last summer. a long time? more than ten years. A: When did you arrive in London? B: Two weeks ago. A: Where have you been staying B: 1¹ But I am going to move to my own flat.next week. A: Hallo. What are you doing here? B: I'm waiting to see the manager. I 2 (wait) for half an hour. A: She's very busy. She 2 A: I didn't know that you could play the piano. B: Oh yes, I rain save study read make learn watch play the beginning of the month. several years. we wrote to them last week. the last time that I saw you? more than two hours. 0 She has been learning. 1 It 2 We 3 4 1 Wendy A: How long B: I started looking immediately after I lost my old job. I 6 5 We 6 The people next door. 7 I (you/stay)? (stay) with some friends in their flat. D Choose the best verb from the box to complete each sentence. Use the Present Perfect Continuous form of the verb. (talk) on the (have) piano lessons for a year. (you/look) for a job? (apply) for jobs for about six months. Spanish for six months. for hours; the roads are very wet. this game for hours. Let's stop! French at school for three years. this book for months, but I haven't finished it yet. this programme for hours. a lot of noise all day. my money for a holiday.

วิธีทำ แต่ละขั้นตอนอย่างละเอียด

7 An important issue for a retailer is to decide when to reorder stock from a supplier. A common policy used to make the decision is of a type called s, S: The retailer orders at the end of a period if the on-hand stock is less than s, and orders enough to bring the stock up to S. The appropriate values of s and S depend on different cost parameters, such as inventory holding costs and the profit per item sold, as well as the distribution of the demand during a period. Consequently, it is important for the retailer to collect data relating to the parameters of the demand distribution. Suppose that the following data give the numbers of a certain type of item sold in each of 30 weeks. 14, 8, 12, 9, 5, 22, 15, 12, 16, 7, 10, 9, 15, 15, 12, 9, 11, 16, 8, 7, 15, 13, 9, 5, 18, 14, 10, 13, 7, 11

Present perfect

1 B Complete the sentences using the Present Perfect form of the verbs in brackets ( ). 0 Don't take my plate away. I haven't finished (not/finish) my meal. 1 A: What's that book about? B: I don't know. I 2 I 3 My father 4 A: I B: Yes madam, what's your name, please? SI 6 I'm not sure what the problem with the car is. It (not/read) it. (lose) my pen. Can I borrow yours, please? (buy) an expensive, new car. (book) a room here for tonight. 7 A: B: No I haven't, but I'll do it soon. C Write this conversation using the Present Perfect and the words in brackets (). Rob: (you/ever / want /to work in another country?) Have you ever wanted to work in another country? (make) some sandwiches. Would you like one? Brian: (Yes, in fact I / work/ abroad.) 1 2 (not/happen) before. (you/reply) to that letter from the bank? (I/work/ in Ireland and in Brazil) 3 (What about you? / you / ever/have/ a job abroad?) 4 Rob: (No, I never / want to leave my home town.) 6 (I / live / here for twenty years, and I / never / think/ of working abroad.) Brian: (Really? Well, I / apply for another job abroad.) D Make sentences with the Present Perfect and for or since. 0 (I/not/play/tennis/ last summer.) I haven't played tennis since last summer. 1 (1/know/her/ more than ten years.) 2 (I/not/eat / anything/lunchtime.) 3 (you/live/ in this town / a long time?) 4 (Jill/be/ a good friend/ we were at school together.) 5 (you/see/Jack/ the party last week?)