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Questions in chemistry

[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. Combustion of glucose $\left( C _6 H _{12} O _6\right)$ is the main source of energy for animal cells: $C_6 H_{12} O_6(s)+6 O_2(g) \rightarrow 6 CO_2(g)+6 H_2 O(l) \quad \Delta G_{r \times n}\left(37^{\circ} C\right)=-2872 . kJ$ 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 formation of one peptide bond, joining one amino acid to another, is $21 kJ / mol$. Suppose some cells are assembling a certain protein made of 81 amino acids. (Note that the number of peptide bonds in the protein will be one less than the number of amino acids.) Calculate the minimum mass of glucose that must be burned to assemble $650 . \mu mol$ of this protein. Round your answer to 2 significant digits. $7.0 \times 10^{-2} . g$

[Terjawab] A chlorine $(Cl)$ and bromine $(Br)$ atom are adsorbed on a small patch of surface (see sketch at right). This patch is known to contain 49 possible adsorption sites. The Cl and bromine $(Br)$ atoms have enough energy to move from site to site, so they could be on any two of them. Suppose the Br atom desorbs from the surface and drifts away. Calculate the change in entropy. Round your answer to 2 significant digits, and be sure it has the correct unit symbol. $-1.1 \times 10^{-25} \frac{J}{K}$

[Terjawab] Which metalloid has three valence electrons? A. boron B. arsenic C. silicon D. lithium

[Terjawab] Fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table: | cation | anion | empirical formula | name of compound | |---|---|---|---| | [tex]$Sr ^{2+}$[/tex] | [tex]$P ^{3-}$[/tex] | | | | [tex]$Sr ^{2+}$[/tex] | [tex]$O ^{2-}$[/tex] | | | | [tex]$Sr ^{2+}$[/tex] | [tex]$s ^{2-}$[/tex] | | | | [tex]$Sr ^{2+}$[/tex] | [tex]$N ^{3-}$[/tex] | | |

[Terjawab] QUESTION 13 The correct name for the compound below is A. ethylpropanoate B. propylethanoate C. propylpropanone D. methylpropanoate QUESTION 14 Which of the following is a structural formula of a ketone compound? A. B. C. D. QUESTION 15 Which one of the following is not balanced for a hydrocarbon compound? | | 2C₂H₆ | + | 7O₂ | → | 4CO₂ | + | 6H₂O | |---|-------|---|-----|---|------|---|------| | | 2C₃H₈ | + | 7O₂ | → | 4CO₂ | + | 4H₂O | | | C₄H₈ | + | 4O₂ | → | 10CO₂| + | 11H₂O| | | 2C₁H₂₂ | + | 21O₂| → | | + | |

[Terjawab] Using the thermodynamic information in the ALEKS Data tab, calculate the standard reaction free energy of the following chemical reaction: [tex]TiCl_4(g)+2 H_2 O(g) \rightarrow TiO_2(s)+4 HCl(g)[/tex] Round your answer to zero decimal places.

[Terjawab] What is the average atomic mass of the element in the data table? | Mass (amu) | Abundance (%) | |---|---| | 10.0 | 19.9 | | 11.0 | 80.1 | A. 21.0 amu B. 41.2 amu C. 10.8 amu D. 35.5 amu

[Terjawab] If given the following scenario: The half-life of Sodium-24 is 15 hours. If you start with 600 grams of sodium-24 how much would be left after 4 days? Which of the following equations could you use to solve for the amount of grams left after 4 days? [tex]$A=600\left(\frac{1}{2}\right)^{\frac{15}{4}}$[/tex] [tex]$A=600\left(\frac{1}{2}\right)^4$[/tex] [tex]$A=600\left(\frac{1}{2}\right)^{\frac{4}{15}}$[/tex] [tex]$A=600\left(\frac{1}{2}\right)^{\frac{96}{15}}$[/tex]

[Terjawab] What choice demonstrates the Law of Conservation of Mass? [tex]194 g HNO _3 \rightarrow 180 g NO _2+32 gO _2+36 g H _2 O[/tex] [tex]110 g Ag _2 O \rightarrow 107 g Ag +32 g O _2[/tex] [tex]98 g CaCO _3 \rightarrow 56 g CaO ^{+} 44 g CO _2[/tex] [tex]30 g LiO _2+44 g CO _2 \rightarrow 74 g LiCO _3[/tex]

[Terjawab] Which statement is true about ionic compounds? A. They are made up of many large molecules that are bonded together. B. They are made up of atoms of only one type of element. C. They are made up of particles that are arranged in a repeating pattern. D. They are made up of a random ratio of elements that are bonded together.