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Questions in chemistry

[Terjawab] 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]$\square$ $Na _3 N+$ $\square$ $SrF _2 \rightarrow$ $\square$ $NaF +$ $\square$ $Sr _3 N_2$[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | | :------ | :------- | :------- | | Na | $\square$ | | | N | $\square$ | $\square$ | | Sr | $\square$ | $\square$ | | F | $\square$ | $\square$ |

[Terjawab] 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]

[Terjawab] Given the following reaction, what will cause no impact on the equilibrium if the forward reaction is endothermic? [tex]2 PbS(s)+3 O_2(g)+C(s) \rightleftharpoons 2 Pb(s)+CO_2(g)+2 SO_2(g)[/tex] A. decreasing pressure B. adding [tex]SO _2[/tex] C. adding [tex]O _2[/tex] D. putting the reaction in an ice bath

[Terjawab] What is the formula of silver sulfate? A. [tex]$AgSO _4$[/tex] B. [tex]$SO _4 Ag _2$[/tex] C. [tex]$Ag _2 SO _4$[/tex] D. [tex]$Ag _2 SO _3$[/tex]

[Terjawab] 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 | $\square$ | $\square$ |

[Terjawab] 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. $Na _3 P$

[Terjawab] 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?

[Terjawab] 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]

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

[Terjawab] 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