Top of Form 1. What is the pH of a buffer that results when 33 g NaHCO3 is mixed with 100.0 mL of 2.50 M NaOH and diluted with water to 250 mL? (Ka for HCO3- = 4.8 10-11) (Points : 10) 8.20 10.07 10.12 10.32 10.56 2. What is the pH of an aqueous solution of 0.30 M HF and 0.15 M F-? (Ka of HF = 7.2 10-4) (Points : 10) 1.83 2.84 3.14 3.44 10.86 3. Which of the following mathematical expressions
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process first the ammonium is oxidized into nitrite and then the nitrite is oxidized into nitrate. Nitrite is toxic; therefore‚ nitrate is the form that almost all nitrogen is absorbed by most crop plants grown on dry land. Step 1: 2NH4 (ammonium)+ 3O2 (Oxygen) ³2NO-2(Nitrite) + 4H+ (hydrogen) + 2H2O Step 2: 2NO-2 (Nitrite) + O2 (oxygen) ³ 2NO-3 (nitrate) This process is detrimental because the plant must reduce it back to amino group (ammonium) before it can incorporate it into amino acids
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Immediately began foaming up and overflowing from the bowl. I also made a ziploc bag explode too. Questions and conclusions: Part I: Reaction between iron and oxygen 1. Write a balanced equation for the reaction between iron and oxygen. 4Fe + 3O2 —> 2Fe2O3 2. Classify the reaction that occurred between the iron and oxygen. Apply this reaction to a real-world situation. It’s oxidation. Oxygen oxidizes from Fe to Fe3+. As for a real-world situation‚ well‚ rusting is a real-world application
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Show your work. N2+3H2=2NH3 24 mol of H2=8 mol of N2 produces 16 mol of ammonia 4. Name the following compound: KMnO4 Potassium permanganate 5. Balance the following equation: KBrO3(s) KBr(s) + O2(g) 2KBrO3(s) = 2KBr(s) + 3O2(g) 6. Write the formulas for silicon dioxide. SiO2 7. Complete and balance the following equation. Then write it as a net ionic equation. K3PO4(aq) + MgCl2(aq) 8. Explain how the atoms of one isotope
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Introduction: In this experiment‚ trans-[Bis(inosinato)palladium(II)]‚ was synthesized. The general reaction equation for the reaction is shown below: KOH (1) K2[PdCl4] + 2 inosine trans-[Pd(inosine-H+)2] + 2KCl + 2HCl The IR spectrum of the product and inosine was analyzed to compare the location of the carbonyl bond when inosine interacts with a metal such as palladium. This study is important because the interaction of metals with an organic base purine
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(l) 2H3O+ (aq) + SO42־ Ethanoic: CH3COOH (s) + H2O (l) H3O+ (aq) + CH3COO־ (aq) Sources of sulfur and nitrogen oxides in the atmosphere: Sulfur Oxides: Organic decomposition: 2H2S (g) + 3O2 (g) 2SO2 (g) + 2H2O (l) Burning high-sulfur coals: S (s) + O2 (g) SO2 (g) Smelting metal sulfides: 2PbS (s) + 3O2 (g) 2PbO (s) + 2SO2 Nitrogen Oxides: Lightning: N2 (g) + O2 (g) 2NO (g) Oxidation of nitrogen monoxide: 2NO (g) + O2 (g) NO2 (g) Amphiprotic
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in the balanced chemical equation for the reaction by its molar mass. Complete the table below‚ using information represented in the chemical equation for the combustion of methanol‚ an alcohol. methanol oxygen → carbon dioxide water 2CH3OH(l) 3O2 (g) → 2CO2(g) 4H2O(g) Substance Molar Mass (g/mol) Number of Molecules Number of Moles (mol) Mass (g) 6. Methanol 32.05 2 2 64.1 7. Oxygen gas 32.00 3 3 96 8. Carbon dioxide 44.01 2 2 88.02 9. Water 18.02 4 4 72.08 10. What are the reactants
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1 - 7 8 - 13 14 - 20 21 - 26 27 - 32 ll SAMPLE QUESTION PAPER–6 Section-A 1. Moving charges / electric current / magnet (any two). 2. (i) To develop male secondary sex organs at puberty. 3. To create green house effect / to trap the solar heat. 4. (a) yellow (b) lead iodide / PbI2 (c) Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) ½+½ ½ 1 ½+½ 1 (ii) To develop male secondary sexual characters like bread ‚ moustaches‚ deep voice etc. ½ 5. Activity : Metal Q is added to salt solution
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CHAPTER 9 : MANUFACTURED SUBSTANCES IN INDUSTRY NAME: NUR INSYIRAH BTE. AB HAMED CLASS: 4 SAINS GUNAAN (SG) SCHOOL: SMK SERI INDAH CONTENT Content Introduction 9.1 Sulphuric acid 9.1.1 Properties of sulphuric acid 9.1.2 The uses of sulphuric acid 9.1.3 The industrial process in manufacture of sulphuric acid 9.1.4 Environmental pollution by sulphuric acid 9.2 Ammonia and its salt 9.2.1 Properties of ammonia 9.2.2 The uses of ammonia 9.2.3 The industrial process in manufacture of ammonia
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Structure of Matter | | 1. | An element consists of three isotopes in the relative abundance given below. What is the atomic mass of this element? | | 30.00% = 40.00 amu50.00% = 41.00 amu20.00% = 42.00 amu | | (A) | 40.90 | | (B) | 41.00 | | (C) | 41.90 | | (D) | 42.20 | | (E) | 42.90 | | | 2. | The total number of electrons that can be accommodated in the fourth principal energy level is _____ | | (A) | 2 | | (B) | 8 | | (C) | 18 | | (D) | 32 | | (E)
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