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Questions in chemistry

[Terjawab] At [tex]$40^{\circ} C$[/tex], 100 g of water dissolved 104 g sodium nitrate. 250 g of water dissolved =?

[Terjawab] How does the solubility of a gas change with increasing temperature? Which other condition can affect the solubility of a gas, and how?

[Terjawab] Combustion of glucose [tex]$\left( C _6 H _{12} O _6\right)$[/tex] is the main source of energy for animal cells: [tex]$C_6 H_{12} O_6(s)+6 O_2(g) \rightarrow 6 CO_2(g)+6 H_2 O(l) \quad \Delta G_{r x n}\left(37^{\circ} C\right)=-2872 . kJ$[/tex] 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 forming one peptide bond, joining one amino acid to another, is [tex]$21 kJ / mol$[/tex]. Suppose some cells are assembling a certain protein made of 71 amino acids. (Note that the number of peptide bonds in the protein will be one less than the number of amino acids.) Calculate the maximum moles of this protein that can be assembled if [tex]$600 . mg$[/tex] of glucose are available for combustion. Round your answer to 2 significant digits.

[Terjawab] Balance the entire chemical reaction using an atom inventory. Remember to balance each element in the reaction. [tex]Mg(OH)_2+HCl \rightarrow MgCl_2+H_2 O[/tex] When the reaction is balanced, what is the coefficient for water, [tex]H _2 O[/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]$248 g AgO \rightarrow 216 g Ag +32 g O _2$[/tex] [tex]$95 g CaCO _3 \rightarrow 56 g CaO +44 g CO _2$[/tex] [tex]$30 g Li _2 O +44 g CO _2 \rightarrow 78 g Li _2 CO _3$[/tex] [tex]$81 g HNO _3 \rightarrow 46 g NO _2+32 g O _2+18 g H _2 O$[/tex]

[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] Complete the table below by writing the symbols for the cation and anion that make up each ionic compound. The first row has been completed for you. | ionic compound | cation | anion | |---|---|---| | NaCl | $Na ^{+}$ | $Cl ^{-}$ | | $MnI _3$ | | | | $MnBr _2$ | | | | $Ag _2 S$ | | | | $CuCl _2$ | | |

[Terjawab] Which statement best describes the relationship between activation energy and rate of reaction? A. Increasing the activation energy can increase the rate of a reaction. B. Reducing the activation energy can increase the rate of a reaction. C. Increasing the reaction energy does not alter the rate of reaction. D. Reducing the activation energy can decrease the rate of a reaction.

[Terjawab] Which statement correctly describes a chemical reaction? A. Reactants come out of a reaction. B. Energy is always released. C. Bonds between atoms break and reform. D. Products go into a reaction.

[Terjawab] Select the correct answer. What is a substance? A. a uniform mixture that can't be separated B. a mixture that can be separated C. a single component that can't be separated D. a single component that can be separated