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Questions in chemistry

[Terjawab] How do changes in state (e.g., boiling, freezing) illustrate the concept of physical changes? What is happening at the molecular level during these changes?

[Terjawab] Consider the following intermediate chemical equations: [tex] \begin{array}{l} CH_4(g)+2 O_2(g) \rightarrow CO_2(g)+2 H_2 O(g) \ 2 H_2 O(g) \rightarrow 2 H_2 O(l) \end{array} [/tex] Which overall chemical equation is obtained by combining these intermediate equations? [tex]CH _4(g)+2 O _2(g) \rightarrow CO _2(g)+2 H _2 O ( l )[/tex] [tex]CH _4(g)+2 O _2(g) \rightarrow CO _2(g)+2 H _2 O ( g )[/tex] [tex]CH _4(g)+2 O _2(g) \rightarrow CO _2(g)+4 H _2 O ( g )+2 H _2 O ( l )[/tex] [tex]CH _4(g)+2 O _2(g) \rightarrow CO _2(g)+6 H _2 O ( g )[/tex]

[Terjawab] What is the final chemical equation from the following intermediate chemical equations? [tex] \begin{array}{l} P_4 O_6(s) \rightarrow P_4(s)+3 O_2(g) \ P_4(s)+5 O_2(g) \rightarrow P_4 O_{10}(s) \end{array} [/tex]

[Terjawab] Two masses of carbon were combined in a flask. What is the total mass of carbon, reported to the appropriate number of significant figures? [tex] \begin{array}{r} 8.2 g \ +0.6634 g \ \hline[?] g \end{array} [/tex]

[Terjawab] 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

[Terjawab] 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]

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

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

[Terjawab] 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.

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