IdeasCuriosas - Every Question Deserves an Answer Logo

Questions in chemistry

[Answered] Consider the following intermediate chemical equations: [tex] \begin{array}{ll} NO(g)+O_3(g) \rightarrow NO_2(g)+O_2(g) & \Delta H_1=-198.9 kJ \\ \frac{3}{2} O_2(g) \rightarrow O_3(g) & \Delta H_2=142.3 kJ \\ O(g) \rightarrow \frac{1}{2} O_2(g) & \Delta H_3=-247.5 kJ \end{array} [/tex] What is the enthalpy of the overall chemical equation [tex]NO ( g )+ O ( g ) \rightarrow NO _2(g)[/tex]? A. -305 kJ B. -304.1 kJ C. -93.7 kJ D. 588.7 kJ

[Answered] Consider the following intermediate chemical equations: [tex] \begin{array}{l} 2 P(s)+3 Cl_2(g) \rightarrow 2 PCl_3(l) \\ PCl_3(l)+Cl_2(g) \rightarrow PCl_5(s) \end{array} [/tex] When you combine the intermediate chemical equations, which substance do you cancel out? A. P B. [tex]Cl_2[/tex] C. [tex]PCl_3[/tex] D. [tex]PCl_5[/tex]

[Answered] Account for the following observation: CO2 and H2O are both oxides. However, H₂O is a polar molecule but CO₂ is not.

[Answered] Which dangerous good qualifies for the Limited Quantity Exemption when transported in quantities of 5 L or less? UN2582 UN3292 UN2676

[Answered] State, giving reasons, which of the following molecules possess and which do not possess an electric dipole, and indicate the nature of the dipole in each case: H₂S, CO₂, HCl, CH₄.

[Answered] Perform the following mathematical operation, and report the answer to the correct number of significant figures. [tex]$9.635 \div 12.9=$[/tex]

[Answered] 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]

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

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

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