Zadanie 27
Which of these species can act as both a Lewis base and a Brønsted–Lowry base? I. CH3NH2 II. BF3 III. H2O A. I and II only B. I and III only C. II and III only D. I, II and III
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Which of these species can act as both a Lewis base and a Brønsted–Lowry base? I. CH3NH2 II. BF3 III. H2O A. I and II only B. I and III only C. II and III only D. I, II and III
In which species would nitrogen be oxidized if it were converted to N2O? A. NO2 B. NH4+ C. HNO3 D. N2O3
Which combination best describes what is happening to propene, CH3CH=CH2, in the equation below? CH3CH=CH2(g) + H2(g) → CH3CH2CH3(g) A. Oxidation and addition B. Oxidation and substitution C. Reduction and addition D. Reduction and substitution
The half-equation below is balanced using the lowest possible whole-number coefficients. a Cr2O72−(aq) + b H+(aq) + c e− → d Cr3+(aq) + f H2O(l) What is the value of c? A. 3 B. 6 C. 7 D. 14
A battery is connected in a circuit. The arrows show the direction of electron flow. What does terminal X of the battery represent? A. Anode and positive terminal B. Anode and negative terminal C. Cathode and positive terminal D. Cathode and negative terminal
What are the products when dilute aqueous sodium sulfate is electrolysed using inert electrodes? E⊖(Na+∣Na) = −2.71 V Choose the products at the anode (positive electrode) and at the cathode (negative electrode). A. Anode:…
Which E⊖ value, in V, for the reaction Mg(s) + Fe2+(aq) → Mg2+(aq) + Fe(s) can be deduced from the following equations? Mg(s) + 2 Ag+(aq) → Mg2+(aq) + 2 Ag(s) E⊖ = 3.17 V…
Which functional groups are present in aspirin (acetylsalicylic acid)? A. Hydroxyl, ester and phenyl B. Carboxyl, ester and phenyl C. Carboxyl, amido and phenyl D. Carboxyl, alkoxy and hydroxyl
Which sequence of reagents converts but-1-ene into butanone? Each reagent is added to the product of the previous reaction. A. HBr, then NaOH(aq), then acidified K2Cr2O7(aq) B. HBr, then acidified K2Cr2O7(aq), then…
Which compounds are members of the same homologous series? A. Methanol, methanal, methanoic acid B. Ethane, ethene, ethyne C. Butan-1-ol, butan-2-ol, 2-methylpropan-2-ol D. Methanal, ethanal, propanal