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Questions in chemistry

[Terjawab] When carbon dioxide dissolves in water, it sometimes reacts with water to form carbonic acid as in this balanced equation: [tex]CO_2+H_2 O \rightarrow H_2 CO_3[/tex]. If 495 milliliters of carbon dioxide at [tex]25^{\circ} C[/tex] and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid? Use the periodic table and the ideal gas resource. A. 0.889 g B. 1.10 g C. 1.27 g D. 2.02 g

[Terjawab] In an element's square on the periodic table, the number with the greatest numerical value represents the A. number of neutrons. B. number of electrons. C. atomic number. D. atomic mass.

[Terjawab] 1. Name any two ores of iron. 2. Write any two ores of copper. 3. Name the chief ores of aluminium.

[Terjawab] Are PFOS a single chemical or multiple forms of "forever chemicals"? A. Multiple forms B. A single form

[Terjawab] 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

[Terjawab] What is the maximum number of electrons that can occupy one orbital? A. 1 B. 2 C. 8 D. 6

[Terjawab] 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 ____.

[Terjawab] 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]

[Terjawab] 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]

[Terjawab] 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.]