Ayuda con la tarea de química: preguntas y respuestas

Q:

a) Describe how one can determine if the bridging oxygen in an ester is from an a Icohol or from the carboxylic acid. \( \mathrm{ks}) \) b) Explain why amides are weaker bases than amines. ks ) c) Draw the enol-keto forms of propanone d) Explain why \( \mathrm{CH}_{3} \mathrm{COOH} \) has a lower Ka than \( \mathrm{CH}_{2} \mathrm{ClCOOH} \quad \) (2marks)

Q:

d) During the preparation of ethene gas in the laboratory, a mixture of ethanol and concentrated sulphuric acid was heated gently and an oily liquid X and water were formed. When the mixture was heated to \( 170^{\circ} \mathrm{C} \), a steady steam of ethene gas was produced. During this process, the flask was kept cool. i). Write the equation for the reaction between ethanol and concentrated sulphuric acid. \( (2 \) marks)

Q:

iv). In which direction does electrons flow in the external circull determined in (iii) above? ( 1 mark) c) A steady current of 2.5 A was passed for 15 minutes through a cell containing divalent ions \( \mathrm{W}^{+2} \). During this process, 0.74 g of metal W was deposited. ( \( \mathrm{F}=96500 \mathrm{C} \) ) i). Calculate the quantity of electricity passed in this cell. ( 2 marks)

Q:

1.2 Mole fraction of each component in \( \mathrm{lb} / \mathrm{lb} \)-mol. [Do not assume a basis]

Q:

Mention two properties of sulphuric acid. (2 marks)

Q:

d) During the preparation of ethene gas in the laboratory, a mixture of ethanol and concentrated sulphuric acid was heated gently and an oily liquid X and water were formed. When the mixture was heated to \( 170^{\circ} \mathrm{C} \), a steady steam of ethene gas was produced. During this process, the flask was kept cool. i). Write the equation for the reaction between ethanol and concentrated sulphuric acid. (2 marks)

Q:

Calcola la massa molecolare di tre acidi piuttosto comuni: l'acido acetico, \( \mathrm{CH}_{3} \mathrm{COOH} ; \) l'acido cloridrico, \( \mathrm{HCl} ; \) l'acido carbonico, \( \mathrm{H}_{2} \mathrm{CO}_{3} \).

Q:

d) Equal volumes of carbon (II) oxide and carbon (IV) oxide were allowed to diffuse through the same medium, calculate the relative rate of diffusion of carbon (II) oxide. (C \( =12, \mathrm{O}=16)(4 \) marks)

Q:

What are the four types of tetrahedral carbon? What are the names of the first ten straight chain alkanes?

Q:

Задача 1. (15 баллов) В пяти пронумерованных склянках находятся пентан, пентен-2, пентин-1, хлорциклопентан, пентанол-1. Как химическим путем распознать, какое вещество находится в каждой из склянок. Опишите последовательность действий мысленного эксперимента. Приведите уравнения возможных качественных реакций и их признаки.

Química preguntas y respuestas

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