Kimya Ödev Yardımı
QuetionAI‘nin kimya problemi çözücüsü, temel kimyasal reaksiyonları ve denklemleri kullanıcılar için gerçek zamanlı olarak özetleyebilen ve zayıf bir temele sahip öğrencilerin bile kimyada kolayca uzmanlaşabilmesi için güçlü bir öğrenme sistemine sahip olan bir ortaokul kimya ders aracıdır.
Artık periyodik tablonun temel özellikleri hakkında endişelenmenize gerek yok. Burada her elemente karşılık gelen kimyasal reaksiyonlara ve reaksiyon prensiplerine kolaylıkla ulaşabilirsiniz. Moleküllerin ve atomların orijinal yapısını, görülebilen makroskobik olaylardan çıkarmak, her zaman savunduğumuz bir kimya araştırma tekniğidir.
- 4 The equation for a reaction that can be used to manufacture lithium carbonate is 2Li_(2)O_(2)+2CO_(2)arrow 2Li_(2)CO_(3)+O_(2) What is the atom economy for this reaction? A 58.9 B 62.1 C 69.8 (D) 82,2 11
- Topic(s): Redox Reactions Which equation represents a redox reaction? AgNO_(3)+NaClarrow AgCl+NaNO_(3) PCl_(5)+4H_(2)Oarrow H_(3)PO_(4)+5HCl 3Fe+4H_(2)Oarrow Fe_(3)O_(4)+4H_(2) MgCO_(3)+2HClarrow MgCl_(2)+CO_(2)+H_(2)O
- Example 3 A sample of orange juice has a Hydrogen ion concentration of 2.9times 10^-4M . What is the pH ?
- multicolumn(3)(|c|){ Table 27.5 The'required' hydrophilic-lipophile balance values for oils and oil phase ingredients Oil & Oil-in-water emulsion & Water-in-oil emulsion Petrolatum & 7-8 & 4 Liquid paraffin & 10.5 & 4 Mineral oil, light & 12 & 4 Castor oil & 14 & - Lanolin, anhydrous & 12 & 8 Beeswax & 9 & 5 Cottonseed oil & 6 & - Pine oil & 16 & - A formulator is required to formulate an oil-in-water emulsion of the basic formula: Liquid paraffin Emulsifying agents (required HLB 10.5) 50 mathrm(~g) 5 mathrm(~g) Water To prepare this liquid paraffin-in-water emulsion, the nonionic emulsifier, or mixture of nonionic emulsifiers, should have the required HLB value of 10.5. This narrows the number of possible surfactants considerably. Although a single surfactant with this HLB value may be suitable, usually it is better to have a mixture of emulsifiers, one with a lower HLB value than required and the other with a higher HLB value than required. In this formulation, suitable emulsifiers are Tween 80 (with an HLB value of 15) and Span 80 (with an HLB value of 4.3). To calculate the fraction x of Tween 80, Eq. 27.2 gives [ } 10.5 & =x times 15+(1-x) times 4.3 15 x-4.3 x & =10.5-4.3 ( is ) 10.7 x=6.2 x & =0.58 ] Thus to match the required HLB of the oil, the fraction for percentage = fraction x 100) of Tween 80 is 0.58(88 %) and that of Span 80 is 0.42(42 %) . Thus 2.9 mathrm(~g)(0.58 times 5) of Tween 80 and 2.1 mathrm(~g)(0.42 times 5) of Span 80 are required for this formulation.
- 1. Identify three applications of terials. arbons as a source of energy and raw materials. 2. Name an organic compound and explain what an organic chemist studies. 3. Describe what each of the four molecular models highlights about a molecule. 4. Compare and contrast saturated and unsaturated hydrocarbons. 5. Describe the process of fractional distillation. 6. Infer Some shortening products are described as "hydrogen ated vegetable oil", which are oils that react with hydrogen in the presence of a catalyst. Form a hypothesis to explain why hydrogen reacted with the oils. 7. Interpret Data Refer to Figure 6 . What property of hydrocarbon molecules correlates to the viscosity'of a particular fraction when it is cooled to room