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Home Question Bank Chemistry Archive 2024 December 08

Chemistry Questions from Dec 08,2024

Browse the Chemistry Q&A Archive for Dec 08,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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The temperature of a \( 500 . \mathrm{mL} \) sample of gas increases from \( 150 . \mathrm{K} \) to \( 350 . \mathrm{K} \). What is the final volume of the sample of gas, if the pressure in the container is kept constant? 1. Based on your experimental data, make a general statement (hypothesis) about the effect of temperature on reaction rate. Make a final hypothesis about the effect of concentration of reactants on reaction rate.| 2. When a sample is broken up into smaller pieces, surface area is increased, because more particle surface is exposed. What can you conclude about the relationship between surface area and reaction rate? Which is the molar mass of \( \mathrm{H}_{2} \mathrm{O} \) ? \( 10.02 \mathrm{~g} / \mathrm{mol} \) \( 16.00 \mathrm{~g} / \mathrm{mol} \) \( 17.01 \mathrm{~g} / \mathrm{mol} \) \( 18.02 \mathrm{~g} / \mathrm{mol} \) What is the molar mass of \( \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right) 3 \) ? \( \begin{array}{l}150.03 \mathrm{~g} / \mathrm{mol} \\ 278.03 \mathrm{~g} / \mathrm{mol} \\ 342.17 \mathrm{~g} / \mathrm{mol} \\ 0.09 \mathrm{~g} / \mathrm{mol}\end{array} \) b) Complete the following equation, in which the strong acid hydrochloric acid will be butfered: \( \mathrm{HCl}+\mathrm{Na}_{2} \mathrm{HPO}_{4} \rightarrow \mathrm{NaCl} \) c) Which product of this reaction has no effect on pH ? d) Which product has only a slight effect on pH ? e) Complete the following equation, in which the strong base sodium hydroxide will be buffered: \( \mathrm{NaOH}+\mathrm{NaH}_{2} \mathrm{PO}_{4} \rightarrow \) Which product of this reaction has no effect on pH ? g) Which product has only a slight effect on pH ? c) Which product of this reaction has no effect on pH ? d) Which product has only a slight effect on pH ? \( \mathrm{NaOH}+\mathrm{NaH}_{2} \mathrm{PO}_{4} \rightarrow \) Complete the following equation, in which the strong base sodium hydroxide will be buffered: f) Which product of this reaction has no effect on pH ? g) Which product has only a slight effect on pH ? 9. Sodium azide, \( \mathrm{NaN}_{3} \), is used in air bags for cars On heating, it decomposes into sodium and nitrogen. What volume of nitrogen, at room temperature and pressure, would be produced by heating one mole of sodium azide? (Molar volume at r.t.p. \( =24 \mathrm{dm}^{3} \) ) Which term represents an intermolecular force in a sample of water? 1. hydrogen bonding 2. covalent bonding 3. metallic bonding 4. ionic bonding
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