19. A type of reaction that is always a REDOX reaction is a. Synthesis b. Decomp
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19. A type of reaction that is always a REDOX reaction is a. Synthesis b. Decomposition c. Single displacement d. Double displacement 20. In both a galvanic and an electrolytic cell, a. An external voltage is required b. The overall reaction is spontaneous c. Electrons travel through an external circuit d. Chemical energy is converted to electrical energy Part B: True or False (20 marks) State whether each of the following statements is true (T) or false (F) 21 An inference is an educated guess. The electron is negatively-charged and located inside the nucleus. 3. A polar covalent bond is formed when there is an unequal sharing of electrons between two non-metal atoms. 24. A precipitate forms when an insoluble product is formed during a chemical 25. reaction 5 Most elements are made up of two or more isotopes. 26. The molecular formula of a compound shows the smallest whole number rati the elements in the compound. 27.The experimental yield is usually greater than the theoretical yield. 28. Concentrations expressed in ppm and ppb are used for very small quantities solutes 29. When a hydrocarbon has no double or triple bonds, it is referred to as bein unsaturated hydrocarbon. 30 The longer the carbon chain of a hydrocarbon, the higher its boiling point 3 1 . ___ In a hydrolysis reaction, water is added to an organic molecule.Explanation / Answer
19. OPTION C. Among the given reactions, double displacement reactions involve only the transfer of counter ions between their parent ions thus involving no oxidation state change. Similarly, syntheses also involve no such change as do decompositions usually. Only in rare cases like oxide formation from metal or decomposition of oxyacid salts involve a redox reaction.
20. OPTION C. In a galvanic cell, spontaneous redox reaction occuring in the cell produces current whereas in electrolytic cells, the externally applied electric current induces a non-spontaneous redox reaction. But in both cases, electrons flow through an external circuit only while they travel from the cell in galvanic cells, they travel into the electrodes for electrolytic cells.
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