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Questions in chemistry

[Answered] Based on the Law of Conservation of Mass, what mass of products form when baking soda decomposes? [tex]$NaHCO _3 \rightarrow Na _2 CO _3+ H _2 O + CO _2$[/tex] 25.00 g ? g Give your answer to the correct number of significant figures.

[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]$\square$ LiI + $\square$ H _2 SO _4 \rightarrow $\square$ Li _2 SO _4+ $\square$ HI[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | | :------ | :------- | :------- | | Li | $\square$ | $\square$ | | I | $\square$ | $\square$ | | H | $\square$ | $\square$ | | S | $\square$ | $\square$ | | O | $\square$ | $\square$

[Answered] 60.0 g of iron, 80.0 g of copper, and 50.0 g of aluminum were each initially at 25°C. If each of these substances gained 100 J of heat, which would have the highest temperature? * 60.0 g of Fe (specific heat of Fe = 0.450 J/g.°C) * 50.0 g of Al (specific heat of Al = 0.902 J/g.°C) * 80.0 g of Cu (specific heat of Cu = 0.385 J/g.°C) A. All three substances would have the same temperature. B. There is no way to determine.

[Answered] What is the name of this ion? $C_2 H_3 O_2^{-}$ | | | | :-------- | :------- | | acetate | cyanide | | hydronium | bicarbonate |

[Answered] What is the formula of aluminum acetate? $\left( C _2 H _3 O _2\right)_3 Al$ $AlC _2 H _3 O _{23}$ AlAc $Al \left( C _2 H _3 O _2\right)_3$

[Answered] The arrangement of electrons around the nucleus is referred to as (A) electron configuration (B) valence electrons.

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

[Answered] 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]

[Answered] 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

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