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Questions in chemistry

[Terjawab] How to prepare a 1M ferric chloride solution

[Terjawab] Your answer is wrong. In addition to checking your math, check that you used the right data and DID NOT round any intermediate calculations. The reduction of Iron(III) oxide ($Fe_2 O_3$) to pure iron during the first step of steelmaking, $2 Fe_2 O_3(s) \rightarrow 4 Fe(s)+3 O_2(g)$ Is driven by the high-temperature combustion of coke, a purified form of coal: $C(s)+O_2(g) \rightarrow CO_2(g)$ Suppose at the temperature of a blast furnace the Gibbs free energies of formation $\Delta G_f$ of $CO_2$ and $Fe_2 O_3$ are $-415. kJ/mol$ and $-840. kJ/mol$, respectively. Calculate the minimum mass of coke needed to produce $440. t$ of pure iron. (One metric ton, symbol t, equals 1000 kg.) Round your answer to 2 significant digits. 30. $\times 10^5 Ikg$

[Terjawab] In what form is carbon found in the atmosphere? [tex]$CO _2$[/tex] [tex]$C _6 H _{12} O _6$[/tex] [tex]$H _2 O$[/tex] ATP

[Terjawab] Classify these salts as either soluble or insoluble: $NH_4CI, PbCl_2, BaSO_4, K_2SO_4, Na_2CO_3, NaNO_3, (NH_4)_2CO_3, MgCO_3, AgNO_3, AgCl$.

[Terjawab] Silica used in the manufacturing of electronics, paints, soaps, and glass does not present a health hazard. A. True B. False

[Terjawab] Which is the noble gas notation for chlorine? A. [Ne] 4s^2 4p^5 B. [Ne] 3s^2 3p^5 C. [Ne] 3s^2 \cdot 3p^3 D. [Ne] 3p^3 3p^5

[Terjawab] A chemist fills a reaction vessel with 0.536 g aluminum hydroxide $\left( Al ( OH )_3\right)$ solid, 0.337 M aluminum $\left( Al ^{3+}\right)$ aqueous solution, and 0.196 M hydroxide $\left( OH ^{-}\right)$aqueous solution at a temperature of $25.0^{\circ} C$. Under these conditions, calculate the reaction free energy $\Delta G$ for the following chemical reaction: $Al(OH)_3(s) \rightleftharpoons Al^{3+}(aq)+3 OH^{-}(aq)$ Use the thermodynamic information in the ALEKS Data tab. Round your answer to the nearest kilojoule.

[Terjawab] The formula for pH is [tex]$pH =-\log \left[ H ^{+}\right]$[/tex], where [tex]$\left[ H ^{+}\right]$[/tex] is the hydrogen ion concentration. The pH of a fruit juice is 3.2. What is the hydrogen ion concentration of the juice? The hydrogen ion concentration [tex]$\left[ H ^{+}\right]$[/tex] is approximately how many moles per liter? (Round to the nearest tenth.)

[Terjawab] Which of the following is NOT a physical hazard category? A. Flammables B. Explosives C. Toxics D. Reactives E. Corrosives

[Terjawab] Combustion of glucose ($C_6H_{12}O_6$) is the main source of energy for animal cells: $C_6H_{12}O_6(s) + 6O_2(g) \rightarrow 6CO_2(g) + 6H_2O(l) \quad \Delta \dot{G}_{r \dot{x} n}(37^{\circ}C) = -2872 . kJ$ One of the most important uses to which this energy is put is the assembly of proteins out of amino acid building blocks. The Gibbs free energy of forma one peptide bond, joining one amino acid to another, is $21 kJ / mol$. Suppose some cells are assembling a certain protein made of 23 amino acids. (Note that the number of peptide bonds in the protein will be one less thar number of amino acids.) Calculate the minimum mass of glucose that must be burned to assemble 450. $\mu$mol of this protein. Round your answer to 2 significant digits.