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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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Barfoed's Test is used to distinguish monosaccharides from disaccharides. The test measures the differential ability of monosaccharides to reduce copper (II) acetate solution to form copper (I) oxide which will results in a brick red precipitate. What is the pH of substance which has a hydronium ion concentration of \( 5.4 \times 10^{-9} ? \) And what type of substance is it? \( \left(\mathrm{pH}=-\log \left[\mathrm{H}_{3} \mathrm{O}^{+}\right]\right) \) A. \( \quad-9 \); neutral \( \begin{array}{l}\text { B. } \\ \text { C. } 5.4 \text {; acidic } \\ \text { D. } \\ \text { D. } \\ \text { 8.3; acidic } \\ \text { E. } 8.3 \text {; basic }\end{array} \) Mole Conversions Learning Check 1. How many atoms of magnesium are present in a 7.5 mole sample of magnesium? 2) \( \mathrm{BaSO}_{4} \) substance that enters into a chemical reaction is called a Blank 1: Chlorine and bromine are in the same group in the periodic table. The bond energy of a Cl-Cl bond is \( 240 \mathrm{~kJ} / \mathrm{mol} \). The bond energy of a \( \mathrm{Br}-\mathrm{Br} \) bond is \( 190 \mathrm{~kJ} / \mathrm{mol} \). Which statement best explains this difference? (1 point) Chlorine atoms form a double bond, and bromine atoms form a single bond. Bromine atoms are more likely than chlorine atoms to interact with other atoms. Bromine has more electron levels than chlorine. Chlorine atoms are larger than bromine atoms. The balanced equations for two reactions are shown. (1) \( \mathrm{CH}_{4}+\mathrm{N}_{2}+\mathrm{H}_{2} \rightarrow \mathrm{CH}_{3} \mathrm{~N}+\mathrm{NH}_{3} \) (2) \( \mathrm{CH}_{4}+\mathrm{I}_{2} \rightarrow \mathrm{CH}_{3} \mathrm{I}+\mathrm{HI} \) Which statement best explains why reaction 1 requires a greater input of energy than reaction 2 ? (1 point) The number of bonds in the reactants in reaction 1 is greater than the number of bonds in the reactants in reaction 2 . The bond energy of the products in reaction 1 is less than the bond energy of the The bond energy of the reactants in reaction 1 is greater than the bond energy of the reactants in reaction 2 . The number of reactants in reaction 1 is greater than the number of reactants in reaction 2 . Which statement about the bond energies of nitrogen, iodine, and fluorine gases correct? (1 point) lodine gas has the highest bond energy. Fluorine gas and nitrogen gas have similar bond energies. The atoms in fluorine gas are held together by a triple bond. The bond in nitrogen gas is the most difficult to break. The chemical potential energy of bond A is greater than the chemical potential energy of bond B . Which statement best explains this observation? (1 point) The atoms in bond A have fewer bonds between them than the atoms in bond B . The atoms in bond A are larger than the atoms in bond B . The atoms in bond A are held more tightly together than the atoms in bond B . The atoms in bond A are farther apart than the atoms in bond B . Worked Example: Relative atomic mass - Calculate the value of Ar for naturally occurring chlorine if the distribution of isotopes is \( 75.77 \%{ }_{17}^{35} \mathrm{Cl} \) and \( 24.23 \%{ }_{17}^{37} \mathrm{Cl} \). Accurate masses for \( { }_{17}^{35} \mathrm{Cl} \) and \( { }_{17}^{37} \mathrm{Cl} \) are 34.97 and 36.97 . Soln:
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