VincenTragosta - Tanya, Jawab, dan Belajar Tanpa Batas Logo

Questions in chemistry

[Terjawab] Which is an intensive property of a substance? A. density B. volume C. length D. mass

[Terjawab] Which of the following particle analysis methods is used to measure the volume of particles? A. Microscopy B. Sedimentation C. Coulter-counter D. Sieving

[Terjawab] Consider the reaction: [tex]2 SO_2(g)+O_2(g) \longleftrightarrow 2 SO_3(g)[/tex] When does the given chemical system reach dynamic equilibrium? A. When the rate of the forward reaction is higher that the rate of the reverse reaction B. When the concentration of the reactants is high than the concentration of the products C. When the rates of the forward and reverse reactions are equal

[Terjawab] What does a pH of 7 say about a solution? A. The solution is acidic. B. The solution is at equilibrium. C. The solution is basic. D. The solution is neutral.

[Terjawab] Each atom of an element has the following electron configuration: [tex]$1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^{10} 4 p^6 5 s^2 4 d^{10} 5 p^5$[/tex] What is the name of the element? A. bromine B. iodine C. tellurium D. xenon

[Terjawab] 109. Identify the set of reagents that can effect bromination in benzene. (a) Bromine/Hydrogen bromide (b) Bromine/FeBr₃/H₂O (c) Bromine/FeBr₃ (d) Bromine/FeBr₂ 110. What is the reagent R in the reaction below? COCl | \ R -> CHO / (a) LiAlH₄ (b) LiAlH[O(CH₃)₃]₃ (c) NaBH₄ (d) H₂/Ni 111. Carboxylic acids have higher melting points compared to alcohols with the same number of carbon atoms because: (a) acids exhibit hydrogen bonding (b) acids have higher molecular weight (c) alcohols have polar character (d) alcohols usually occur as dimers 112. Identify Q in the reaction represented by the equation below: CONH₂ | \ Q -> NH₂ / (a) LiAlH₄ (b) KBr (c) KMnO₄ (d) NaNH₂ 113. Which of the following pairs of compounds will exhibit isomerism? (a) C₄H₁₀ and C₂H₅O (b) C₄H₁₀ and C₂H₆O (c) C₄H₁₀ and C₂H₅O₂ (d) C₄H₁₀ and C₆H₁₂ 114. An ester will not be formed when an alcohol is reacted with: (a) a carboxylic acid (b) an aldehyde (c) an acid anhydride (d) an acid chloride 115. Esters generally have lower boiling points than their corresponding carboxylic acids because: (a) they are volatile (b) they are associated (c) they are not associated (d) are non-volatile 116. Which of the following statement(s) is/are true of esters? (a) they are colourless liquids (b) they have a pleasant fruity odour (c) they are used for flavouring (d) all of the above 117. The reduction of esters to alcohols can be brought about by: (a) LiAlH₄/C₂H₅OH (b) LiAlH₄/(C₂H₅)₂O (c) NaBH₄/(C₂H₅)₂O (d) NaBH₄/C₂H₅OH

[Terjawab] Which will not appear in the equilibrium constant expression for the reaction below? [tex]H_2 O(g)+C(s) \longleftrightarrow H_2(g)+CO(g)[/tex] A. [C] B. [tex][H _2][/tex]

[Terjawab] How four atoms, labeled $W, X, Y$, and $Z$, can combine with each other to form Which combination of atoms will not form a compound? W and X X and Y W and Z Y and Z

[Terjawab] The equation below represents a reaction that takes place in an industrial process. [tex]4NH_3 + 5O_2 \rightarrow 6H_2O + 4NO[/tex] a. Name the catalyst used. b. What are the other conditions for the reaction? c. Why are the products cooled before being oxidized?

[Terjawab] Select the correct answer. Which statement correctly relates two substances from this reaction? [tex]H_2 CO_3+H_2 O \rightleftharpoons H_3 O^{+}+HCO_3^{-}[/tex] A. [tex]HCO _3{ }^{-}[/tex] is the conjugate acid of [tex]H _2 CO _3[/tex]. B. [tex]H _2 O[/tex] is the conjugate base of [tex]H _2 CO _3[/tex]. C. [tex]H _3 O ^{+}[/tex] is the conjugate acid of [tex]H _2 O[/tex]. D. [tex]H _2 CO _3[/tex] is the conjugate base of [tex]H _3 O ^{+}[/tex].