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Questions in chemistry

[Answered] 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]0.4(mol / L ) / s[/tex] C. [tex]0.2(mol / L ) / s[/tex] D. [tex]1.6(mol / tL ) / s[/tex]

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

[Answered] Select the correct answer. Which element or compound has lost electrons in this oxidation-reduction reaction? [tex]4 Li+2 CoO \rightarrow 2 Co+2 Li_2 O[/tex] A. CoO B. [tex]Li _2 O[/tex] C. Li D. Co E. [tex]O[/tex]

[Answered] The table below gives the atomic mass and relative abundance values for the three isotopes of element M. | Relative abundance (%) | Atomic mass (amu) | | :---------------------- | :----------------- | | 78.99 | 23.9850 | | 10.00 | 24.9858 | | 11.01 | 25.9826 | What is the average atomic mass (in amu) of element M?

[Answered] Which of the following is the correct Lewis structure for dicarbon tetrahydride, [tex]C_2H_4[/tex], also known as ethene?

[Answered] Ethyne ( [tex]$C _2 H _2$[/tex] (g), [tex]$\Delta H_f=226.77 kJ / mol$[/tex] ) undergoes complete combustion in the presence of oxygen to produce carbon dioxide ([tex]$CO _2(g), \Delta H_f=-393.5 kJ / mol$[/tex]) and water ([tex]$H _2 O ( g ), \Delta H_f=-241.82 kJ / mol$[/tex]) according to the equation below. [tex]$2 C_2 H_2(g)+5 O_2(g) \rightarrow 4 CO_2(g)+2 H_2 O(g)$[/tex] What is the enthalpy of combustion (per mole) of [tex]$C _2 H _2(g)$[/tex]? Use [tex]$\Delta H_{r \times n}=\sum\left(\Delta H_{f, \text { products }}\right)-\sum\left(\Delta H_{f, \text { reactants }}\right)$[/tex]. A. -2511.2 kJ / mol B. -1255.6 kJ / mol C. -862.1 kJ / mol D. -431.0 kJ / mol

[Answered] What happens to the potential energy of the molecules in a reaction? A. The reactants only lose potential energy when forming products. B. The potential energy of the products is equal to that of the reactants. C. The potential energy of the molecules does not change in a reaction. D. The potential energy of the molecules changes during a reaction.

[Answered] Which answer below correctly identifies the type of change and the explanation for the boiling of water? A. physical change because even though the change caused the temperature of the water to increase, the water's physical properties remained exactly the same B. physical change because even though gas formation was observed, the water was undergoing a state change, which means that its original properties are preserved C. chemical change because gas formation was observed, which indicated that the water was transformed into a different substance D. chemical change because a temperature change was observed, which indicated that the water was transformed into a different substance

[Answered] What are synthetic polymers NOT made out of? A. Oil B. Coal C. Natural Gas D. Organic Fibers

[Answered] How many oxygen atoms are there in the following compound: 2HNO