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Questions in chemistry

[Terjawab] Given the following reaction at equilibrium, write the Keq expression. $2 SO_2(g)+O_2(g) \leftrightharpoons 2 SO_3(g)$ A. $Keq =\frac{\left[ SO _2\right]^2\left[ O _2\right]}{\left[ SO _3\right]^2}$ B. $Keq =\frac{\left[ SO _3\right]}{\left[ SO _2\right]\left[ O _2\right]}$ C. $Keq =\frac{\left[ SO _3\right]^2}{\left[ SO _2\right]^2\left[ O _2\right]}$ D. $Keq =\frac{\left[ SO _2\right]\left[ O _2\right]}{\left[ SO _3\right]}$

[Terjawab] Complete the table: | | | | :------- | :---------------- | | nitrite | [tex]$NO _2^{-}$[/tex] | | acetate | [tex]$C _2 H _3 O _2^{-}$[/tex] | | permanganate | {[?]} | | {[$\square$]} | [tex]$CrO _4^{-2}$[/tex] | | chlorate | {[$\square$]} | | {[$\square$]} | [tex]$CN^{-}$[/tex] |

[Terjawab] Calculate the temperature at which technetium becomes superconducting in degrees Celsius. Round your answer to 5 significant figures.

[Terjawab] A chemistry student needs 30.0 mL of tetrahydrofuran for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of tetrahydrofuran is [tex]$0.889 g cm ^{-3}$[/tex]. Calculate the mass of tetrahydrofuran the student should weigh out. Round your answer to 3 significant digits.

[Terjawab] What is the name of this ion? [tex]NO_3^-[/tex] | nitrite | hydronium | | nitrate | nitride |

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

[Terjawab] Select the correct answer. In a given chemical reaction, the energy of the products is greater than the energy of the reactants. Which statement is true for this reaction? A. Energy is absorbed in the reaction. B. Energy is released in the reaction. C. No energy is transferred in the reaction. D. Energy is created in the reaction. E. Energy is lost in the reaction.

[Terjawab] The specific heat of copper metal is 0.385 J/g.°C. How many joules of heat are required to raise the temperature of a 2.63 g block of copper from 25.0°C to 79.7 °C? Report your answer with the correct number of significant figures in regular form. Do not include units in your answer.

[Terjawab] A flask contains an acidic solution with a concentration of $7.1 \times 10^{15}$ hydrogen ions per milliliter. If $4.8 \times 10^{23}$ hydrogen ions have a total mass of 0.8 grams, which of the following is closest to the concentration, in grams per liter, of the acidic solution? (A) $1.2 \times 10^{-5}$ (B) $1.2 \times 10^{-8}$ (C) $1.5 \times 10^{-5}$ (D) $1.5 \times 10^{-8}$

[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 K_2 SiO_3+\square CoF_2 \rightarrow \square KF+\square CoSiO_3[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | | :------ | :------- | :------- | | K | | | | Si | | | | O | | | | CO | | | | F | | |