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Home Question Bank Chemistry Archive 2024 December 14

Chemistry Questions from Dec 14,2024

Browse the Chemistry Q&A Archive for Dec 14,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Identify the correct name of \( \mathrm{CH}_{3}-\mathrm{C}\left(\mathrm{CH}_{3}\right)_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{3} \). A. 2,2-dimethylbutane B. methylneopentane C. 2-methyl-2-ethylpropane D. 2,2-dimethypentane E. 3,3-dimethybutane 1. A 2. B 3. C 4. D 5. E №3. Определите, какая масса мели вступит в реакцию с концентрированной серной кислотой для получения оксида серы (IV) объёмом 3 л (н.у.), если выход оксида серы (IV) составляет \( 90 \% \). 4. What is the percent composition of carbon in \( \mathrm{CO}_{2} \) ? ( \( \mathrm{C}=12 \mathrm{~g} / \mathrm{mol}, \mathrm{O}= \) \( 16 \mathrm{~g} / \mathrm{mol}) \) 1. จงแปลงค่าความเข้มข้น \( \mathrm{SO}_{2} 0.7 \mathrm{ppm} \) ที่สภาวะบรรยากาศ \( 760 \mathrm{~mm} . \mathrm{Hg} \) อุณหภูมิ \( 25^{\circ} \mathrm{C} \) ให้เป็นหน่วย \( \mu_{\Im} / \mathrm{m}^{3} \) 2. จงแปลงความเข้มข้น \( \mathrm{SO} 2320 \mu_{\mathrm{g}} / \mathrm{m}^{3} \) เป็นหน่วย ppb โดยกำหนดให้ความดันที่วัด \( =1.0 \) บรรยากาศ ณ ที่อุณหภูมิ \( 27^{\circ} \mathrm{C} \) 3. จงแปลงความเข้มข้นของสารละลาย NaCl จาก 25 ppm เป็น \( \mathrm{kg} / \mathrm{mL} \) 4. จงแปลงค่ากากตะกอนหนัก \( 12 ~ \) \( \mu \mathrm{~g} / \mathrm{mg} \) เป็น ppm Q11: Which of the following electron configurations is correct for Cobalt (Co)? A) \( [\operatorname{Ar}] 3 d^{7} 4 s^{2} \) B) \( [\mathrm{Ne}] 4 s^{2} 3 d^{7} \) C) \( [\operatorname{Ar}] 4 s^{1} 4 d^{7} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{7} \) D) \( [\operatorname{Ar}] 4 s^{2} 3 d^{6} \) La molécule SO2 a une géométrie 8 po en V ; l'angle des deux liaisons S-0 est de 119․ Son moment dipolaire mesuré est de 1,65 D (1 D = 0,333 10-29 C . m). 1-Donner la structure de Lewis de cette molécule. Montrer qu'on peut la décrire par deux structures mésomères obtenues soit en " excitant " S, soit en " excitant " O. 2- La longueur de liaison expérimentale est de 1,43 A' \( ^{\circ} \). Comparer la valeur calculée. Conclusion ? 3- Calculer le pourcentage d'ionicité de ces A sewage treatment plant discharges a pollutant with a concentration of \( 6 \mathrm{mg} / \mathrm{L} \). The plant's total discharge is 0.5 MGD (millions of gallons per day). Determine the rate of pollutant released in pounds day. Give your answer accurate to at least two decimal places. Hint: 0.5 MGD is 500,000 gallons per day. Use these conversion factors: \( 1 \mathrm{gal}=3.785 \mathrm{~L}, 1000 \mathrm{mg}=1 \mathrm{~g} \), \( \mathrm{g}=1 \mathrm{~kg} \), and \( 1 \mathrm{~kg}=2.2 \) lbs. A sewage treatment plant discharges a pollutant with a concentration of \( 6 \mathrm{mg} / \mathrm{L} \). The plant's total discharge is 0.5 MGD (miltions of gallons per day). Determine the rate of pollutant released in pounds pel day. Give your answer accurate to at least two decimal places. \[ \text { Общие химические свойства кислот } \] \( \quad \begin{array}{l}\text { 1. Кислота }+ \text { основание или амфотерный гидроксид } \rightarrow \text { соль }+ \text { вода } \\ \text { 2. Кислота }+ \text { основный или амфотерный оксид } \rightarrow \text { соль }+ \text { вода } \\ \text { 3. Кислота1 }+ \text { соль } 1 \rightarrow \text { кислота } 2+\text { соль } 2, \text { если образуется осадок или } \\ \text { выделяется газ }\end{array} \) a) Beer: \( \mathrm{pH}=4.9 \) \( \left[\mathrm{H}^{+}\right]=\square \times 10^{\square} \mathrm{M} \) (b) Water: \( \mathrm{pH}=6.8 \) \( \left[\mathrm{H}^{+}\right]=\square \times 10 \square \mathrm{M} \)
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