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Questions in chemistry

[Terjawab] 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.

[Terjawab] Consider this reaction: $KOH + HBr \rightarrow KBr + H _2 O$ Which is the acid in this reaction? A. KOH B. HBr C. KBr D. $H _2 O$

[Terjawab] Gas Laws Fact Sheet | Ideal gas law | [tex]PV=nRT[/tex] |

[Terjawab] 20) An element has atomic number 12. In which period and group should it be placed? 21) The electronic configuration of an atom is 2,8,8,2. To which period and group does it belong? 22) The molecular formula of a certain ionic compound is xyz and 'x' is a metal. State the groups to which elements 'x' and 'y' belong in the periodic table. 23) Write any two differences between Mendeleev's periodic table and the modern periodic table. 24) Clarify the relation between the size of the atoms of metals and their chemical reactivity. 25) Clarify the relation between the size of the atoms of non-metals and their chemical reactivity.

[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] 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.

[Terjawab] 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.

[Terjawab] 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.

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

[Terjawab] 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.