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Questions in chemistry

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

📝 Answered - 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).

📝 Answered - 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

📝 Answered - 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

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

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

📝 Answered - In the following reaction, which molecule functions as the oxidizing agent? Pyruvate + NADH + H+ -> Lactate + NAD+ A. NADH B. Lactate C. Pyruvate D. NAD+

📝 Answered - 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 [tex]300 K[/tex], where [tex]n=4[/tex].

📝 Answered - Which statement describes how phase changes can be diagrammed as a substance is heated? A. The phase is on the y-axis and the temperature is on the x-axis. B. The temperature is on the y-axis and the phase is on the x-axis. C. The time is on the y-axis and the temperature is on the x-axis. D. The temperature is on the y-axis and the time is on the x-axis.

📝 Answered - Two masses of gold were measured before they were melted down. What is the total mass of the gold, reported to the appropriate number of significant figures? [tex] \begin{array}{r} 15.650 g \\ +10.23 g \\ \hline \square g \end{array} [/tex]