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Questions in chemistry

[Terjawab] Choose the products that complete the reaction. The chemical equation may not be balanced. [tex]$NaHCO _3+ HC _2 H _3 O _2 \rightarrow$[/tex] ? A. [tex]$NaC _2 H _3 O _2+ H _2 O$[/tex] B. [tex]$NaC _2 H _3 O _2+ CO _2+ H _2 O$[/tex] C. [tex]$NaC _2 H _3 O _2+ H _2$[/tex]

[Terjawab] A chemistry teacher adds 50.0 mL of $1.50 M H _2 SO _4$ solution to 200 mL of water. What is the concentration of the final solution? Use $M_i V_i=M_i V_{\text {T }}$. A. 0.300 M B. 0.375 M C. 6.00 M D. 7.50 M

[Terjawab] Consider the half reactions below for a chemical reaction. [tex]\begin{array}{l} Mg \longrightarrow Mg^{2+}(aq)+2 e^{-} \\ 2 H^{+}(aq)+2 e^{-} \longrightarrow H_2(g) \end{array}[/tex] What is the overall equation for this chemical reaction? A. [tex]Mg ( s )+2 H ^{+}( aq ) \longrightarrow Mg ^{2+}( aq )+ H _2(g)[/tex] B. [tex]Mg ( s )+2 H ^{+}( aq ) \longrightarrow Mg ^{2+}( aq )+2 e ^{-}[/tex] C. [tex]Mg ^{2+}( aq )+ H _2(g) \longrightarrow Mg ( s )+2 H ^{+}( aq )[/tex] D. [tex]Mg ( s )+2 H \longrightarrow Mg ( aq )+ H _2(g)[/tex]

[Terjawab] A certain buffer solution contains equal concentrations of X⁻ and HX. The K_b for X⁻ is 10⁻¹⁰. The pH of the buffer is: 1) 4 2) 7 3) 10 4) 14

[Terjawab] Which example involves a phase change in which heat energy is released by the substance? A. freezing ice cream B. cooking a pot of soup C. melting ice under sunlight D. watching frost disappear into air

[Terjawab] Given: [tex]$2 LiBr+Ba \rightarrow BaBr_2+2 Li$[/tex] In this chemical reaction, 325 grams of barium (Ba) react completely. How many moles of lithium (Li) are produced? A. 1.18 mol B. 2.37 mol C. 4.73 mol D. [tex]$16.4 mol^{\prime}$[/tex] E. 32.9 mol

[Terjawab] What is the pH of [tex]$5.22 \times 10^{-3} M HClO _4( H ^{+})$[/tex] solution? A. none of these B. 5.22 C. [tex]$1.92 \times 10^{-12}$[/tex] D. 0.438 E. 2.28

[Terjawab] What is the value for [tex]$\Delta G$[/tex] at 100 K if [tex]$\Delta H=27 kJ / mol$[/tex] and [tex]$\Delta S$ =0.09 kJ /( mol \cdot K )$[/tex] ? A. [tex]$\Delta G=2700 kJ / mol$[/tex] B. [tex]$\Delta G=-36 kJ / mol$[/tex] C. [tex]$\Delta G=18 kJ / mol$[/tex] D. [tex]$\Delta G=0 kJ / mol$[/tex]

[Terjawab] What is $K_b$ for $C_5H_5N(aq) + H_2O(l) = C_5H_5NH^+(aq) + OH^-(aq)$? A. $K_b = \frac{[C_5H_5N]}{[C_5H_5NH^+][OH^-]}$ B. $K_b = \frac{[C_5H_5NH^+ HOH^-]}{[C_5H_5N]}$ C. $K_b = \frac{[C_5H_5NH^+]}{[C_5H_5N]}$ D. $K_b = [C_5H_5N^+] |O^-|$

[Terjawab] A beaker contains a solution of calcium hydroxide $\left( Ca ( OH )_2\right)$ in water. A student places a straw in the beaker and then breathes into the solution through the straw. As the student breathes into the solution, a white precipitate forms. What is the most likely composition of the precipitate? A. $H _2 O$ B. $CaCO _3$ C. $CH _3 OH$