12. A base is a compound that can form a basic solution when dissolved. 13. Acidic solutions have a lower pH than pure water. This is due to the greater concentration of H+ ions than pure water. 14. Strong acids and bases are dangerous to cells. Buffers are dissolved compounds that help prevent sharp, sudden swings in pH. Section Review 2-3 1. Carbohydrates 2. Proteins 3. Lipids 4. Nucleic Acids 5. Proteins 6. Proteins 7. Carbohydrates 8. Nucleic Acid 9
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nucleus, known as the mass number, is not the same for two isotopes of any element. Components of nucleic acid 1). DNA = deoxyribonucleic acid - genetic material that stores information to synthesize proteins and to replicate new DNA. The genetic code is based on four nitrogen bases: adenine (A), thymine (T), guanine (G), cytosine (C). A bind with T and G binds with C.2). RNA = ribonucleic acid - helps in synthesizing proteins. There are three main types of RNA.a. mRNA - messenger RNA, copy of the
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coiled over protein sheath d. coiled around each other 2. Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by a. Nitrogenous basesugarphosphate b. basesugarOH c. sugarphosphate d. (base sugar phosphate)n Lipids are insoluble in water because lipids are a. Hydrophilic b. Neutral c. Zwitterions d. Hydrophobic ATP is a. vitamin b. Enzyme c. Nucleic Acid d. Nucleotide In which of the following groups are all polysaccharides a. Sucrose, glucose and fructose
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9 3. The gaseous state 13 4. Concentrations of solutions 17 5. Calculations connected to titrimetry 28 6. Electrolytic dissociation 33 7. Dilute solutions 38 8. Hydrogen ion concentration, pH, buffers 44 9. Heterogeneous equilibria. Crystallisation, solubility product, partition coefficient 55 10. Thermochemistry 64 11. Electrochemistry 67 2 INTRODUCTION The chapter is devoted to helping the students practice
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be weighed in air. Why potassium hydrogen phthalate can be used for titration in such case? Potassium hydrogen Phthalate(KHP) is a solid acid that is stable in a high state of purity and is unaffected by air it does not absorb moisture from the air like NaOH. KHP can also be used as a buffering agent in a combination with NaOH,it cannot be used as a buffer for decarboxylation the KHP and mop up the conjunction groups. State clearly the technique used in order to standardize the solution of NaOH
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bicarbonate buffer system” ('Transport of Carbon Dioxide in the Blood', 2015). It is not soluble in water, however, water is the main carrier transporting it from cells to lungs. PH levels for every individual vary according to their body’s organism. A balanced pH is needed “to ensure the proper functioning of metabolic processes and the delivery of the right amount of oxygen to tissues” (Labtestsonline.org, 2015). During a days cycle the body’s’ “chemical environment changed from a weak acid to a
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Human Biology Week 1: Worksheet 1. Consider the organization of life. Identify the different levels of organization from the cell to the organism. -The cell is the smallest unit displaying the properties of life that is the basic structural and functional unit of organisms. -Tissues are a group of similar cells that performs similar functions. - Organ is a structure that contains at least two different types of tissues that work together for a common purpose. -Organ system is a group of
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number of words with varied meaning that can be formed using only 26 letters as building blocks. A similar situation exists for proteins where an incredible variety of proteins can be formed using 20 different building blocks called amino acids. Each of these amino acid building blocks has a different chemical structure and different properties (Figure
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to USEPA Method 350.1 and Standard Methods 4500–NH3 H. Prior to analysis, ammonia is buffered to pH 9.5 and distilled into a solution of boric acid. Cyanate, which may be encountered in certain industrial effluents, hydrolyzes to some extent, even at the pH of 9.5 at which distillation is carried out. #Distillation - adding excess base to the acid digestion mixture to convert NH4+ to NH3, followed by boiling and condensation of the NH3 gas in a receiving solution. #Titration - to quantify
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1. An oxygen atom has eight protons. (a) Sketch in the arrangement of electrons around the nucleus of the oxygen atom in the following diagram. (b) How many more electrons will it take to fill the outermost energy level? 2. What is the following type of decomposition reaction called? A–B–C–D + H2O → A–B–C–H + HO–D 3. The subatomic particle with the least mass (a) carries a negative charge, (b) carries a positive charge, (c) plays no part in the atom’s chemical reactions, (d) is found only
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