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Questions in chemistry

[Answered] Fill in the gaps to balance the equation. Use the smallest set of whole numbers to balance the equation and include coefficients of "1" when appropriate. [tex]$\square$ Mg _3 P _2+ $\square$ Ag _2 S \rightarrow $\square$ MgS + $\square$ Ag _3 P[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | |---|---|---| | Mg | $\square$ | $\square$ | | P | $\square$ | $\square$ | | Ag | $\square$ | $\square$ | | S | $\square$ | $\square$ |

[Answered] What is the correct formula for the ionic compound that would result from the combination of sodium and phosphorus? A. $Na _3 Ph$ B. $S _3 P$ C. $NaP _3$ D. $Na _3 P$

[Answered] Consider the chemical equations shown here. [tex]$\begin{array}{l}< CH_4(g)+2 O_2(g) \rightarrow CO_2(g)+2 H_2 O(g) \Delta H_1=-802 kJ \\ 2 H_2 O(g) \rightarrow 2 H_2 O(l) \Delta H_2=-88 kJ \end{array}$[/tex] Which equation shows how to calculate [tex]$\Delta H_{ rxn }[/tex] for the equation below? [tex]$CH_4(g)+2 O_2(g) \rightarrow CO_2(g)+2 H_2 O(l)$[/tex] What is [tex]$\Delta H_{ rxn }[/tex] for the overall reaction?

[Answered] What choice demonstrates the Law of Conservation of Mass? A. [tex]$26 g CaO +8 g H _2 O \rightarrow 31 g Ca ( OH )_2$[/tex] B. [tex]$2 g H _2+16 g O _2 \rightarrow 19 g H _2 O$[/tex] C. [tex]$74 g Fe ^{+} 32 g O _2 \rightarrow 105 g Fe _2 O _3$[/tex] D. [tex]$50 g Mg +33 g O _2 \rightarrow 83 g MgO$[/tex]

[Answered] Convert the condensed formula $CH_3CH(OH)CH(CH_3)_2$ into a Lewis structure (including all lone pair electrons)

[Answered] Which is the electron configuration for nobelium (No)? A. [ Rn ] 7 s^2 5 f^{14} B. [ Rn ] 7 s^2 5 f^7 C. [ Ne ] 3 s^2 3 p^7 D. [ Xe ] 6 s^2 5 d^1

[Answered] What is the correct formula for lithium sulfide? LiS2 Li₂S Li₂S LiS

[Answered] Consider the chemical equations shown here. [tex] \begin{array}{l} 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 [tex]$\Delta H_{\text {rxn }}$[/tex] for the reaction shown below? [tex]$NO(g)+O(g) \rightarrow NO_2(g)$[/tex]

[Answered] What law says the total amount of substance at the beginning of a reaction must be equal to the amount of substance at the end of the reaction? A. Law of Conservation of Heat B. Law of Conservation of Moles C. Law of Conservation of Mass D. Law of Conservation of Energy

[Answered] $2 C_6 H_6(l)+15 O_2(g)-12 CO_2(g)+6 H_2 O(l) \quad \Delta H^{\circ}=?$ -5195.6 kJ -6338.8 kJ -1260.6 kJ -6534.8 kJ +1260.6 kJ