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Hogar Banco de preguntas Química Archive 2025 January 22

Chemistry Questions from Jan 22,2025

Browse the Chemistry Q&A Archive for Jan 22,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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3. The graph shows the amount of a chemical in a water sample it is decreasing exponentially. Find the coordinates of the points labeled , and . Explain your reasoning xi. The synthesis of which of the following polymers require the loss of water molecules on a regular basis? (a) Polythene (b) Buma-N (c) Nylon-6,6 (d) Buna-S xii. The chemical added to detect leakage from LPG cylinder is (a) TEL (b) iso-octane (c) iso-butane (d) ethyl mercaptan xiii. The amount of electricity required to produce 12 gm of at respective electrode from acidulated water is- (a) 1 F (b) 2 F (c) 1.5 F (d) 0.5 F xiv. Oxidation number of O in is (a) -2 (b) +2 (c) -1 (d) +1 xv. Octane number of petrol is calculated considering the percentage of (a) Isoprene (b) iso-octane (c) n-hexadecane (d) iso-butane. Setting and hardening of cement involves (a) hydrolysis and neutralization (b)hydration and neutralization (c) hydration and hydrolysis (d) dehydration and hydrolysis. The synthesis of which of the following polymers require the loss of water molecules on a regular basis? (a) Polythene (b) Buna-N (c) Nylon-6,6 (d) Buna-S The chemical added to detect leakage from LPG cylinder is (a) TEL (b) iso-octane Setting and hardening of cement involves (a) hydrolysis and neutralization (b) hydration and neutralization (c) hydration and hydrolysis (d) dehydration and hydrolysis. free carbon. Which of the following is not a characteristic property of good lubricant? (a) high (b) high thermal stability (c) high oiliness (d) high viscosity index vi. Which element is not suitable to form H -bond? (a) Cl (b) F (c) O (d) vii. During the metal extraction from ore, froth flotation process is performed for (a) Sulphide ore (b) Carbonate ore (c) Oxide ore (d) Sulphate ore viii. Proximate analysis of coal involves the estimation of \% of (a) carbon, hydrogen (b) moisture content, volatile matter, ash, free carbon (c) moisture content (d) volatile m How many significant figures are in the measurement 603.040 g ? How many of the zeros in the measurement 0.050060 m are significant? A chemist has a mixture with a temperature of . Then they cool the mixture. The temperature changes by . What is the temperature of the mixture after it cools? Show your work. a) Si l'on ajoute un neutron au noyau de l'atome de carbone du doc.4, obtient-on un isotope ou un élément différent? Justifier et donner la représentation symbolique de ce nouvel atome b) Si l'on ajoute un proton au noyau de l'atome de carbone du doc.4, obtient-on un isotope ou un elément différent? Justifier et donner la représentation symbolique de ce nouvel atorne. c) A parrir de la definition donnée dans le doc.6, proposer une formule permettant de calculer la masse molaire atomique M à partir de la masse d'un atome. Préciser alors l'unité de M en fonction des autres unités. d) Donner la composition des trois atomes de magnésium du doc. 5 et en déduire une définition du terme " isotopes * un peu différente de celle donnée au doc. 3 .
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