Topic
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.
Q:
Indica in quali condizioni un gas reale si può
considerare ideale.
Q:
Che cosa si intende per "gas perfetto" o "gas ideale"?
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