Basic Chemistry 基础化学 第六章_智慧树知到答案2021年

第六章 Advanced Chemical Equations：Stoichiometric equations, which are balanced, are vital in the day-to-day operations in any laboratory, where substances are being weighed constantly. Chapter 6 is thus all about chemical equations and how to apply them in different types of reactions.6.1Rules and Balancing Equations:Rules are needed to balance chemical equations. Simple examples are given in the video as well as worksheets, included in the course materials.
6.2Combustion and Decomposition Reactions:Combustion reactions are those involving oxygen and perhaps elements or hydrocarbons. In decomposition reactions, a substance undergoes a reaction to produce two, or more, smaller molecules. Examples and exercises support student learning here.The topic develops further via many calculations about molecular masses, the mole and how to elucidate chemical formulae from analyses.
6.3Neutralization Reactions:Neutralization reactions are commonly used in titrimetry. Conjugate acid and conjugate base formation and their strengths are included.
6.4Single Replacement Reactions:Single replacement reactions are when four ions react and two are precipitated out of solution. Other metathesis reactions follow, including electrolyte types.

[单选题]What is the empirical formula of a compound that contains 49.4 % K, 20.3 % S, and 30.3 % O by mass?

选项:[KSO3, KSO4, K2SO4, KSO2, K2SO3]
[单选题]The solubility of manganese (II) hydroxide (Mn(OH)2) is 2.2 × 10-5 M. What is the Ksp of Mn(OH)2?

选项:[4.3 × 10-14, 2.1 × 10-14, 1.1 × 10-14, 4.8 × 10-10, 2.2 × 10-5]
[单选题]When the following equation is balanced, the coefficient of Al is __________. Al (s) + H2O (l) → Al(OH)3 (s) + H2 (g)

选项:[4, 2, 5, 1, 3]
[单选题]A compound contains 40.0 % C, 6.71 % H, and 53.29 % O by mass. The molecular weight of the compound is 60.05 amu. The molecular formula of this compound is __________.

选项:[C2H2O4, CH2O, CHO2, C2H3O4, C2H4O2]
[单选题]When the following equation is balanced, the coefficient of O2 is __________. C2H4O (g) + O2 (g) → CO2 (g) + H2O (g)

选项:[5, 1, 2, 3, 4]
[单选题]The balanced equation for the decomposition of sodium azide is __________.

选项:[NaN3 (s) → Na (s) + N2 (g), 2NaN3 (s) → 2Na (s) + 2N2 (g), 2NaN3 (s) → 2Na (s) + 3N2 (g), 2NaN3 (s) → Na2 (s) + 3N2 (g), NaN3 (s) → Na (s) + N2 (g) + N (g)]
[单选题]When the following equation is balanced, the coefficients are __________. NH3 (g) + O2 (g) → NO2 (g) + H2O (g)

选项:[4, 3, 4, 3, 1, 1, 1, 1, 2, 3, 2, 3, 4, 7, 4, 6, 1, 3, 1, 2]
[单选题]Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N2 → Mg3N2 In a particular experiment, a 9.27 g sample of N2 reacts completely. The mass of Mg consumed is __________ g.

选项:[0.92, 24.1, 16.1, 8.04, 13.9]
[单选题]Write the balanced equation for the reaction that occurs when methanol, CH3CH (l) is burned in air. What is the coefficient of methanol in the balanced equation?

选项:[3, 2, 4, 1.5, 1]
[单选题]Which of the following reactions is a redox reaction? (a) K2CrO4 + BaCl2 → BaCrO4 + 2KCl (b) Pb22+ + 2Br- → PbBr (c) Cu + S → CuS

选项:[(a) only, (c) only, (a) and (c), (b) only, (b) and (c)]