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Questions in chemistry

📝 Answered - 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.

📝 Answered - The reaction below is at dynamic equilibrium. [tex]$N_2(g)+3 H_2(g) \longleftrightarrow 2 NH_3(g)$[/tex] Which statement is true for the equilibrium system? A. The concentration of [tex]$NH _3$[/tex] is greater than the concentration of [tex]$N _2$[/tex]. B. The rate of the forward reaction equals the rate of the reverse reaction. C. The rate of the forward reaction is greater than the rate of the reverse reaction.

📝 Answered - During a water treatment program, 127 grams of calcium nitrate, [tex]Ca (NO _3)_2[/tex], is dissolved in water. The final volume of the solution is 2,300 milliliters. What is the molarity of the solution? Refer to the periodic table to help you answer. Express your answer to two significant figures. The molarity of the solution is $\square$ M.

📝 Answered - Consider the reaction below. [tex]2 N_2 O_5(g) \longleftrightarrow 4 NO_2(g)+O_2(g)[/tex] If the reaction is at dynamic equilibrium at 500 K, which statement applies to the given chemical system? A. The rates of the forward and reverse reactions are unequal. B. The concentrations of the products and reactants do not change. C. The forward reaction stops at 500 K.

📝 Answered - Select the chemical equation that most likely represents the reaction between the vinegar and the dolomite. $MgCO _3+2 HCH _3 COO \rightarrow Mg + CO _3+\left( CH _3 COO _2+ H _2 O \right.$ $MgCO _3+2 HCH _3 COO \rightarrow Mg \left( CH _3 COO _2+ CO _2+ H _2 O \right.$ $\left.MgCO _3+2 HCH _3 COO \rightarrow Mg(CH_3 COO \right)_2+ H _2 O$ $MgCO _3+2 HCH _3 COO \rightarrow Mg \left( CH _3 COO \right)_2+ CO _2$

📝 Answered - Which statement describes how phase changes can be diagrammed as a substance is heated? A. The phase is on the y-axis and the temperature is on the x-axis. B. The temperature is on the y-axis and the phase is on the x-axis. C. The time is on the y-axis and the temperature is on the x-axis. D. The temperature is on the y-axis and the time is on the x-axis.

📝 Answered - Which are the products in the equation [tex]CH _3 SH +4 O _2 \rightarrow CO _2+ SO _2+2 H _2 O[/tex]? A. [tex]CH _3 SH[/tex] B. [tex]O _2[/tex] C. [tex]CO _2[/tex] D. [tex]SO _2[/tex] E. [tex]H _2 O[/tex]

📝 Answered - 5. A compound 'A' with molecular formula C₄H₉Br is treated with aqueous KOH solution. The rate of this reaction depends upon the concentration of compound 'A' only. When another optically active isomer 'B' of this compound was treated with aqueous KOH solution, the rate of reaction was found to be dependent on concentration of compound and KOH both. (a) Write down the structural formula of both A and B. (b) Out of these two compounds, which one will be converted to the product with inverted configuration?

📝 Answered - How much would the boiling point of water increase if 4 mol of NaCl were added to 1 kg of water ([tex]K_{ b }=0.51^{\circ} C /( mol / kg )[/tex] for water and [tex]l=2[/tex] for NaCl )? A. [tex]2.04^{\circ} C[/tex] B. [tex]4.08^{\circ} C[/tex] C. [tex]0.51^{\circ} C[/tex] D. [tex]1.02^{\circ} C[/tex]

📝 Answered - What is [tex]$K_{\text {eq }}$[/tex] for the reaction [tex]$N _2+3 H _2 \rightleftharpoons 2 NH _3$[/tex] if the equilibrium concentrations are [tex]$\left[ NH _{-}\right]=3 M[/tex], [tex]$\left[ N _{-}\right]=2 M$[/tex], and [tex]$\left[ H _{-}\right]=1 M$[/tex]? A. [tex]$K_{ eq }=1.5$[/tex] B. [tex]$K_{\text {eq }}=4.5$[/tex] C. [tex]$K_{\text {eq }}=0.75$[/tex] D. [tex]$K_{\text {eq }}=1.125$[/tex]