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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]$\square$ RbBr + $\square$ HNO _3 \rightarrow $\square$ RbNO _3+ $\square$ HBr[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | | :------ | :------- | :------- | | Rb | $\square$ | $\square$ | | Br | $\square$ | $\square$ | | H | $\square$ | $\square$ | | N | $\square$ | $\square$ | | O | $\square$ | $\square$

[Terjawab] A physical chemist measures the temperature [tex]$T$[/tex] inside a vacuum chamber. Here is the result: [tex]$T=-70.941{ }^{\circ} C$[/tex] Convert [tex]$T$[/tex] to SI units. Round your answer to 6 significant figures. ______ K ______ [tex]$\times 10$[/tex]

[Terjawab] Given the following thermochemical equation: [tex]2 H_2(g)+O_2(g) \rightarrow 2 H_2 O(I) \quad \Delta H^{\circ}=-571.6 kJ[/tex] Determine the enthalpy change for the reaction below: [tex]4 H_2 O(l) \rightarrow 4 H_2(g)+2 O_2(g) \quad \Delta H^{\circ}=?[/tex] A. -2286 kJ B. -1143 kJ C. -571.6 kJ D. 1143 kJ E. 2286 kJ

[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]$\square$ C _2 H _6+ $\square$ O _2 \rightarrow $\square$ CO _2+ $\square$ H _2 O[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | | :------ | :------- | :------- | | C | $\square$ | $\square$ | | H | $\square$ | $\square$ | | O | $\square$ | $\square$ |

[Terjawab] In addition, which statement below best explains why physical and chemical changes do NOT violate the Law of Conservation of Matter? a. Physical and chemical changes always involve the same reactants and products b. Physical and chemical changes always produce less product than reactant c. Physical and chemical changes do not gain or lose atoms in the formation of the product

[Terjawab] What is the correct formula that would result from the combination of the two ionic species? [tex]$NH _4^{+}$[/tex] and [tex]$SO _4{ }^{2-}$[/tex] A. [tex]$NH _4(SO _4)_2$[/tex] B. [tex]$(NH _4)_2 SO _4$[/tex] C. [tex]$NH _4 SO _4$[/tex] D. [tex]$SO _4(NH _4)_2$[/tex]

[Terjawab] What concentration of $C$ equals 1 in 10,000 solution of Potassium Permanganate?

[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 | [tex]$\square$[/tex] | [tex]$\square$[/tex] | | N | [tex]$\square$[/tex] | [tex]$\square$[/tex] | | Sr | [tex]$\square$[/tex] | [tex]$\square$[/tex] | | F | [tex]$\square$[/tex] | [tex]$\square$[/tex] |

[Terjawab] Compare the total mass of the reactants to the total mass of the products. What choice demonstrates the Law of Conservation of Mass? [tex]$12 g C + 22 g O_2 \rightarrow 44 g CO_2$[/tex] [tex]$4 g H_2 + 61 g Cl_2 \rightarrow 75 g HCl$[/tex] [tex]$23 g Na + 12 g H_2O \rightarrow 40 g NaOH + 1 g H_2$[/tex] [tex]$10 g H_2 + 46 g N_2 \rightarrow 56 g NH_3$[/tex]

[Terjawab] What is the correct formula that would result from the combination of the two ionic species? [tex]$Mg ^{2+}$[/tex] and [tex]$PO _4{ }^{3-}$[/tex] A. [tex]$Mg _3(PO _4)_2$[/tex] B. [tex]$Mg (PO _4)_3$[/tex] C. [tex]$MgPO _4$[/tex] D. [tex]$Mg _2(PO _4)_3$[/tex]