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Questions in chemistry

[Terjawab] Consider the chemical equations shown here. [tex] \begin{array}{l} 2 Na(s)+Cl_2(g) \rightarrow 2 NaCl(s) \ 4 Na(s)+O_2(g) \rightarrow 2 Na_2 O(s) \end{array} [/tex] What is the overall equation for the reaction that produces NaCl and [tex]O _2[/tex] from [tex]Na _2 O[/tex] and [tex]Cl _2[/tex]? A. [tex]Na _2 O ( s )+ Cl _2(g) \rightarrow NaCl ( s )+ O _2(g)[/tex] B. [tex]2 Na _2 O ( s )+ Cl _2(g) \rightarrow 2 NaCl ( s )+ O _2(g)[/tex] C. [tex]2 Na _2 O ( s )+2 Cl _2(g) \rightarrow 4 NaCl ( s )+ O _2(g)[/tex]

[Terjawab] Explain why NH3 has a much larger dipole moment, 1.46D than NF3, 0.24D.

[Terjawab] Listen Which of the following bolded atoms is a hydrogen bond pair donor? 1) $H - O -$ 2) $- C - H$ 3) $- N - H$ 4) $H - H$

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] 2. The electronic configuration of a [tex]Cr ^{2+}[/tex] ion is [tex]$3 d^4 4 s^0$[/tex]. Calculate the magnetic susceptibility for a salt containing one kg mole of [tex]Cr ^{2+}[/tex] ions at 300 K. [tex] [/tex] [tex]$(1.25 \times 10^{-4})$[/tex] (Hint : Orbital angular momentum of [tex]Cr ^{2+}[/tex] is quenched by the presence of the crystal field).

[Terjawab] Listen The [tex]$\Delta H$[/tex] for a reaction is [tex]$-2 kJ / mol$[/tex], and the [tex]$\Delta S$[/tex] is [tex]$-100 J /(mol * K)$[/tex]. At what temperature will the reaction go forward? 1) Under 20 K 2) Over 20 K 3) Over 200 K 4) Under 200 K

[Terjawab] You have a solution [tex]$pH =12$[/tex] that contains a weak acid with [tex]$pK _{ a }=10$[/tex]. You have 0.001 M of the protonated form. What's the concentration of the deprotonated form? 1) 0.1 M 2) 0.0001 M 3) 1 M 4) 10 M

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] Perform the following mathematical operation, and report the answer to the correct number of significant figures. [tex]0.0016 \div 0.849=[?][/tex]