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Abbey Lovelace

Abbey L.

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INSTANT ANSWER

HA is a weak acid. Which equilibrium corresponds to the equilibrium constant \( K_{b} \) for \( A^{-} \)? Select one: A. \( \mathrm{HA}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq}) \rightleftharpoons \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{H}^{+}(\mathrm{aq}) \) B. \( \mathrm{A}^{-}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{HA}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq}) \) C. \( \mathrm{A}^{-}(\mathrm{aq})+\mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq}) \rightleftharpoons \mathrm{HA}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \) D. \( \mathrm{HA}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{H}_{2} \mathrm{~A}^{+}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq}) \) E. \( \mathrm{A}^{-}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq}) \rightleftharpoons \mathrm{HOA}^{2-}(\mathrm{aq}) \)

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INSTANT ANSWER

What is the conjugate acid of \( \mathrm{HCO}_{3}{ }^{-} \)? Select one: A. \( \mathrm{HCO}_{2}{ }^{2-} \) B. \( \mathrm{CO}_{3}{ }^{2-} \) C. \( \mathrm{CO}_{2}{ }^{2-} \) D. \( \mathrm{H}_{2} \mathrm{CO}_{3} \) E. none of the above

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INSTANT ANSWER

The standard cell potential ( \( \mathrm{E}^{\circ} \) cell) of the reaction below is \( +1.34 \mathrm{~V} \). The value of \( \Delta \mathrm{G}^{\circ} \) for the reaction is \( \qquad \) \( \mathrm{kJ} / \mathrm{mol} \). \[ 3 \mathrm{Cu}(\mathrm{s})+2 \mathrm{MnO}_{4}^{-}(\mathrm{aq})+8 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow 3 \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{MnO}_{2} \text { (s) }+4 \mathrm{H}_{2} \mathrm{O} \text { (I) } \] Select one: A. +259 B. +776 C. -24.3 D. -776 E. -259

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INSTANT ANSWER

Which element is reduced in the following reaction? \[ \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+6 \mathrm{~S}_{2} \mathrm{O}_{3}{ }^{2-}+14 \mathrm{H}^{+} \rightarrow 2 \mathrm{Cr}^{3+}+3 \mathrm{~S}_{4} \mathrm{O}_{6}{ }^{2-}+7 \mathrm{H}_{2} \mathrm{O} \] Select one: A. 0 B. \( \mathrm{S}_{4} \mathrm{O}_{6}{ }^{2-} \) C. \( \mathrm{Cr} \) D. \( \mathrm{S} \) E. H

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INSTANT ANSWER

Calculate the \( \mathrm{pH} \) of a solution at \( 25.0^{\circ} \mathrm{C} \) that contains \( 2.95 \times 10^{-12} \mathrm{M} \) hydronium ions. Select one: A. 2.47 B. 11.53 C. 12.00 D. 7.00 E. 2.95

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INSTANT ANSWER

What is the name of the compound below?

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INSTANT ANSWER

The half-life of \( { }^{223} \mathrm{Ra} \) is 11.4 days. How much of a \( 200.0 \mathrm{mg} \) sample remains after 600 hours? Select one: A. \( 43.8 \mathrm{mg} \) B. \( \quad 6.04 \mathrm{mg} \) C. \( 0.219 \mathrm{mg} \) D. \( 21.9 \mathrm{mg} \) E. \( .0302 \mathrm{mg} \)

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INSTANT ANSWER

The half-life of \( { }^{218} \) Po is 3.1 minutes. How much of a 155 gram sample remains after 0.40 hours? Select one: A. \( 0.00067 \mathrm{~g} \) B. \( 0.0047 \mathrm{~g} \) C. \( 0.72 \mathrm{~g} \) D. \( 0.0072 \mathrm{~g} \) E. none of the above

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INSTANT ANSWER

Find the exact value of the expression \( \tan \left(\cos ^{-1}\left(-\frac{1}{2}\right)\right) \) \[ \boldsymbol{\operatorname { t a n }}\left(\boldsymbol{\operatorname { c o s }}^{-1}\left(-\frac{1}{2}\right)\right)=\square \] (Type an exact answer, using \( \pi \) and radicals as needed.)

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INSTANT ANSWER

Use the Substitution Formula, \( \int_{a}^{b} f(g(x)) \cdot g^{\prime}(x) d x=\int_{g(a)}^{g(b)} f(u) \) du where \( g(x)=u \), to evaluate the following integrals. a. \( \int_{0}^{1} t \sqrt{36+13 t} d t \) b. \( \int_{1}^{25} t \sqrt{36+13 t} d t \) a. \( \int_{0}^{1} t \sqrt{36+13 t} d t= \) b. \( \int_{1}^{25} t \sqrt{36+13 t} d t= \)

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