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Questions in chemistry

[Answered] 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]Mg^{2+}[/tex] | [tex]MnO_4^-[/tex] | | | [tex]Cr^{3+}[/tex] | [tex]OH^-[/tex] | | | [tex]Ca^{2+}[/tex] | [tex]NO_3^-[/tex] | |

[Answered] Perform the following mathematical operation, and report the answer to the correct number of significant figures. [tex]$0.0030 \times 8.65=[?]$[/tex]

[Answered] 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.

[Answered] Balance the entire chemical reaction using an atom inventory. Remember to balance each element in the reaction. [tex]HBr+Ba(OH)_2 \rightarrow BaBr_2+H_2 O[/tex] When the reaction is balanced, what is the correct whole number coefficient for hydrobromic acid, HBr?

[Answered] Listen Which classification of matter includes materials that can no longer be identified their individual properties? A) Mixture B) Atom C) Compound D) Element

[Answered] For a certain chemical reaction, the equilibrium constant [tex]K=6.6 \times 10^6[/tex] at [tex]25.0{ }^{\circ} C[/tex]. Calculate the standard Gibbs free energy of reaction. Round your answer to 2 significant digits.

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

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

[Answered] 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.

[Answered] 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]?