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Questions in chemistry

[Terjawab] What is the coefficient of oxygen gas after balancing the following equation? [tex]N_2(g) + O_2(g) \rightarrow N_2O_5(s)[/tex] A. 4 B. 5 C. 2 D. 1

[Terjawab] Which of the following is a SYNTHETIC polymer? A. nucleic acids B. protiens C. cellulose D. polyethylene E. sugars

[Terjawab] The following reaction occurs in a car's catalytic converter. [tex]2 NO(g)+2 CO(g) \longrightarrow N_2(g)+2 CO_2(g)[/tex] Which answer best describes the reducing and oxidizing processes in this reaction? A. NO and CO are both reducing agents. B. NO and CO are both oxidizing agents. C. The oxidation state of nitrogen in NO changes from +2 to 0, and the oxidation state of carbon in CO changes from +2 to +4 as the reaction proceeds. D. The oxidation state of nitrogen in NO changes from 0 to +2, and the oxidation state of carbon in CO changes from +4 to +2 as the reaction proceeds.

[Terjawab] What is the rate of a reaction if the value of [tex]k[/tex] is 0.1, [tex][A][/tex] is 1 M, and [tex][B][/tex] is 2 M? Rate [tex]=K[A]^2[B]^2[/tex] A. [tex]0.8(mol / L ) / s[/tex] B. [tex]0.1(mol / L ) / s[/tex] C. [tex]0.2(mol / L ) / s[/tex] D. [tex]16(mol / L ) / s[/tex]

[Terjawab] What effect does temperature have on reaction rate? A. An increase in temperature slows the reaction down. B. An increase in temperature does not change the reaction rate. C. An increase in temperature speeds up the reaction rate. D. An increase in temperature keeps the reaction from stopping.

[Terjawab] Write the position of Sodium in the modern periodic table. Why is it known as alkali metal?

[Terjawab] Which of the following can easily form an ionic bond with a cation? Sr Ne [tex]$NH _4{ }^{+}$[/tex] [tex]$PO _4{ }^{3-}$[/tex]

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

[Terjawab] The molar mass of NaOH is $40.00 g / mol$. If 5.20 g NaOH are dissolved in 0.500 L of solution, what is the molarity of the solution? Use molarity $=\frac{\text { moles of solute }}{\text { liters of solution }}$. A. 0.0125 M B. 0.260 M C. 3.85 M D. 7.69 M

[Terjawab] What period is F (fluorine) in? A. 17 B. 7 A C. 7 B D. 2