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Questions in chemistry

[Terjawab] Which are the products in the equation [tex]CH _3 SH +4 O _2 \rightarrow CO _2+ SO _2+2 H _2 O[/tex]? A. [tex]CH _3 SH[/tex] B. [tex]O _2[/tex] C. [tex]CO _2[/tex] D. [tex]SO _2[/tex] E. [tex]H _2 O[/tex]

[Terjawab] 5. A compound 'A' with molecular formula C₄H₉Br is treated with aqueous KOH solution. The rate of this reaction depends upon the concentration of compound 'A' only. When another optically active isomer 'B' of this compound was treated with aqueous KOH solution, the rate of reaction was found to be dependent on concentration of compound and KOH both. (a) Write down the structural formula of both A and B. (b) Out of these two compounds, which one will be converted to the product with inverted configuration?

[Terjawab] How much would the boiling point of water increase if 4 mol of NaCl were added to 1 kg of water ([tex]K_{ b }=0.51^{\circ} C /( mol / kg )[/tex] for water and [tex]l=2[/tex] for NaCl )? A. [tex]2.04^{\circ} C[/tex] B. [tex]4.08^{\circ} C[/tex] C. [tex]0.51^{\circ} C[/tex] D. [tex]1.02^{\circ} C[/tex]

[Terjawab] What is [tex]$K_{\text {eq }}$[/tex] for the reaction [tex]$N _2+3 H _2 \rightleftharpoons 2 NH _3$[/tex] if the equilibrium concentrations are [tex]$\left[ NH _{-}\right]=3 M[/tex], [tex]$\left[ N _{-}\right]=2 M$[/tex], and [tex]$\left[ H _{-}\right]=1 M$[/tex]? A. [tex]$K_{ eq }=1.5$[/tex] B. [tex]$K_{\text {eq }}=4.5$[/tex] C. [tex]$K_{\text {eq }}=0.75$[/tex] D. [tex]$K_{\text {eq }}=1.125$[/tex]

[Terjawab] (a) Acetylation of one of the following compounds: phenols (β-naphthol, vanillin, salicylic acid) by any one method: Using conventional method or using green approach.

[Terjawab] Type the correct answer in the box. Round your answer to the nearest hundredth. A solution has a hydronium concentration of [tex]$4.7 \times 10^{-11}$[/tex]. What is the pH of the solution? The pH of the solution is $\square$

[Terjawab] Consider the following reversible reaction. [tex]2 H_2 O(g) \leftrightarrow 2 H_2(g)+O_2(g)[/tex] What is the equilibrium constant expression for the given system? A. [tex]K _{ eq }=\frac{\left[ H _2 O \right]}{\left[ H _2\right]\left[ O _2\right]}[/tex] B. [tex]K _{ eq }=\frac{\left[ H _2 O \right]^2}{\left[ H _2\right]^2\left[ O _2\right]}[/tex] C. [tex]K _{ eq }=\frac{\left[ H _2\right]^2\left[ O _2\right]}{\left[ H _2 O \right]}[/tex] D. [tex]K _{ eq }=\frac{\left[ H _2\right]^2\left[ O _2\right]}{\left[ H _2 O \right]^2}[/tex]

[Terjawab] What is the correct formula of dinitrogen hexoxide? A. [tex]$NO _3$[/tex] B. [tex]$N _6 O _2$[/tex] C. [tex]$N _2 O _6$[/tex] D. [tex]$N _2 O _4$[/tex]

[Terjawab] What does a positive ΔH look like on a potential energy diagram? A. The potential energy of the products is equal to the potential energy of the reactants. B. The potential energy of the reactants is greater than the potential energy of the products. C. The activation energy of the reactants is less than the activation energy of the products. D. The potential energy of the products is greater than the potential energy of the reactants.

[Terjawab] Which is the electron configuration for boron? A. $1 s^2 2 s^3$ B. $1 s^2 2 s^2 3 s^1$ C. $1 s^1 2 s^2 2 p^2$ D. $1 s^2 2 s^2 2 p^1$