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Questions in chemistry

[Terjawab] Consider the balanced equation below. [tex]4 NH_3+3 O_2 \rightarrow 2 N_2+6 H_2 O[/tex] What is the mole ratio of [tex]NH _3[/tex] to [tex]N _2[/tex]? A. 2:4 B. 4:2 C. 4:4 D. 7:2

[Terjawab] Consider the following intermediate chemical equations: [tex] \begin{array}{l} C(s)+\frac{1}{2} O_2(g) \rightarrow CO(g) \ CO(g)+\frac{1}{2} O_2(g) \rightarrow CO_2(g) \end{array} [/tex] How will oxygen appear in the final chemical equation? A. [tex]O _2(g)[/tex] as a product B. [tex]O _2(g)[/tex] as a reactant C. [tex]O ( g )[/tex] as a product. D. [tex]2 O ( g )[/tex] as a reactant

[Terjawab] What is the basic unit of matter? A. atom B. molecule C. gas D. compound

[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. 5887 k . l

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

[Terjawab] True or False? Oxidizers can burn more intensely than either flammable or combustible substances.

[Terjawab] $MgCl _2(aq)$ and $Na _3 PO _4(aq)$ $Mg Cl _2( aq ) + Na _3 PO _4( aq ) \rightarrow$ Molecular Equation Complete Ionic Equation Net Ionic Equation Spectator Ions

[Terjawab] Select all that apply. Which of the following are included in the study of chemistry? A. The effect of Earth's gravitational field on matter B. The definition of mass C. The changes matter undergoes D. The study of matter

[Terjawab] Suppose 15.3 g of potassium chloride is dissolved in 250 mL of a 0.30 M aqueous solution of silver nitrate. Calculate the final molarity of chloride anion in the solution. You can assume the volume of the solution doesn't change when the potassium chloride is dissolved in it. Round your answer to 3 significant digits.

[Terjawab] Which of the following usually have lower melting points than ionic solids? A. Atomic solids B. Metallic solids C. Molecular solids D. Network solids