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Questions in chemistry

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

[Terjawab] 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].

[Terjawab] 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.

[Terjawab] 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]

[Terjawab] Perform the following mathematical operation and report the answer to the correct number of significant figures. $7.9256 \div 4.372=[?]$

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

[Terjawab] Oct-3-yne condensed structural formula

[Terjawab] Label each of the following changes as a physical or chemical change. A. A mirror is broken. B. An iron nail corroded in moist air. C. Copper metal is melted. D. A catalytic converter changes nitrogen dioxide to nitrogen gas and oxygen gas.

[Terjawab] According to the duplet rule, a maximum of 2 electrons makes the K shell stable. Why does calcium, which has 2 electrons, react by losing 2 electrons?

[Terjawab] According to the duplet rule, a maximum of 2 electrons makes the K shell stable. Why does calcium, which has 2 electrons, react by losing 2 electrons?