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Questions in chemistry

📝 Answered - Which of the following does not illustrate the law of multiple proportions? A. H₂O₂ and H₂O B. CO₂ and CO C. Na₂O and Na₂O₂ D. H₂O and D₂O

📝 Answered - What is the maximum number of electrons that can occupy one orbital? A. 1 B. 2 C. 8 D. 6

📝 Answered - Use the table to answer the questions below. When the temperature in a room increases from [tex]$25^{\circ} C$[/tex] to [tex]$33^{\circ} C$[/tex], changes from a solid to a liquid. In a lab, methane and nitrogen are cooled from [tex]$-170^{\circ} C$[/tex] to [tex]$-200^{\circ} C$[/tex]. The methane freezes and the | Substance | Melting point ([tex]$^{\circ} C$[/tex]) | Boiling point ([tex]$^{\circ} C$[/tex]) | |---|---|---| | Gallium ([tex]$(Ga)$[/tex]) | 30 | 2,204 | | Gold ([tex]$(Au)$[/tex]) | 1,064 | 2,856 | | Methane ([tex]$(CH_4)$[/tex]) | -183 | -162 | | Nitrogen ([tex]$(N_2)$[/tex]) | -210 | -196 | nitrogen When gold is heated to [tex]$2,856^{\circ} C$[/tex] it changes from a liquid to a ____.

📝 Answered - Consider the general reversible reaction: [tex]aA + bB \longleftrightarrow cC +d D[/tex] What is the equilibrium constant expression for the given system? A. [tex]K_{e q}=\frac{C^{\prime}[C] d[D]}{a[A] b[B]}[/tex] B. [tex]K_{e q}=\frac{[C][D]}{[A][B]}[/tex] C. [tex]K_{e q}=\frac{[A]^a[B]^b}{[C]^c[D]^d}[/tex] D. [tex]K_{e q}=\frac{[C]^c[D]^d}{[A]^d[B]^b}[/tex]

📝 Answered - Which of the following choices is the equilibrium constant of a reaction? A. [tex]$K_{ eq }=[$[/tex] reactants [tex]$]+[$[/tex] products [tex]$]$[/tex] B. [tex]$K_{\text {eq }}=$[/tex] [products][reactants] C. [tex]$K_{\text {eq }}=\frac{\text { [reactants] }}{\text { [products] }}$[/tex] D. [tex]$K_{\text {eq }}=\frac{\text { (products) }}{\text { [reactants] }}$[/tex]

📝 Answered - Which of the following statements is correct for the Bronsted-Lowry acid-base reaction [tex]HCN+HCO_3^{-} \rightleftharpoons CN^{-}+H_2 CO_3[/tex] A. [No correct response.] B. [tex]HCO _3^{-}[/tex] is the conjugate base of HCN. C. [tex]HCO _3{ }^{-}[/tex] and [tex]CN ^{-}[/tex] are a conjugate acid-base pair. D. HCN is the conjugate acid of [tex]HCO _3^{-}[/tex]. E. [More than one correct response.]

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

📝 Answered - Gas Laws Fact Sheet | Ideal gas law | [tex]PV=nRT[/tex] |

📝 Answered - 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.