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Questions in chemistry

[Terjawab] During the reaction between potassium hydroxide and 2-bromopropane, 2-propanol is formed. Suggest the correct mechanism for this reaction. Choose an answer: A) $S_N2$ B) $S_N1$ C) Neither $S_N1$ nor $S_N2$

[Terjawab] In _______ elements, the outermost shell of an atom contains half the number of electrons needed to complete the shell. It may either borrow or lend electrons.

[Terjawab] The reaction below is at dynamic equilibrium. [tex]N_2(g)+3 H_2(g) \longleftrightarrow 2 NH_3(g)[/tex] Which statement is true for the equilibrium system? A. The concentration of [tex]NH _3[/tex] is greater than the concentration of [tex]N _2[/tex]. B. The rate of the forward reaction equals the rate of the reverse reaction. C. The rate of the forward reaction is greater than the rate of the reverse reaction.

[Terjawab] How do chemical properties differ from physical properties? What is a chemical change? Provide two examples.

[Terjawab] Consider the reaction: [tex]2 HF(g) \longleftrightarrow H_2(g)+F_2(g)[/tex] At equilibrium at 600 K, the concentrations are as follows: [tex] \begin{array}{l} {[HF]=5.82 \times 10^{-2} M} \\ {\left[H_2\right]=8.4 \times 10^{-3} M} \\ {\left[F_2\right]=8.4 \times 10^{-3} M} \end{array} [/tex] What is the value of [tex]K _{ eq }[/tex] for the reaction expressed in scientific notation? A. [tex]2.1 \times 10^{-2}[/tex] B. [tex]2.1 \times 10^2[/tex] C. [tex]2.2 \times 10^{-1}[/tex] D. [tex]1.2 \times 10^{-3}[/tex]

[Terjawab] Consider this reaction: $2 LIOH + H _2 SO _4 \rightarrow 2 H _2 O + LI _2 SO _4$ Which compound is acting as an acid in this reaction? A. LIOH B. $H _2 SO _4$ C. $H _2 O$ D. $H _2 SO _4$

[Terjawab] The pH level, [tex]$P$[/tex], of a liquid can be determined from the hydronium ion [tex]$\left( H _2 O ^{+}\right)$[/tex] concentration, c, using the equation [tex]$P=- log ( c )$[/tex]. If the pH level of grape juice is 3.3, what is the hydronium Ion concentration? A. [tex]$501 \times 10^{-4}$[/tex] B. [tex]$1.19 \times 10^{-2}$[/tex] C. [tex]$1.99 \times 10^3$[/tex] D. [tex]$153 \times 10^4$[/tex]

[Terjawab] Select the correct answer. What is the hydronium $(H_3O^+)$ concentration of a solution with a pH of 3.60? A. $2.5 \times 10^{-4} M$ B. $3.0 \times 10^{-4} M$ C. $4.0 \times 10^{-11} M$ D. $4.5 \times 10^{-11} M

[Terjawab] Which of the following solutions will have maximum osmotic pressure? Assume 90% dissociation of each salt: (a) Decimolar aluminium sulphate (b) Decimolar barium chloride solution (c) Decimolar sodium sulphate solution (d) Solution of equal volumes of decimolar barium chloride and decimolar sodium sulphate solutions

[Terjawab] What volume, in liters, of 1.5 M [tex]$CaCl _2$[/tex] solution can be made using [tex]$1200.0 g CaCl _2$[/tex]? [tex] \begin{array}{c} CaCl_2: 110.98 g / mol \\ {[?] L} \end{array} [/tex]