Topic
Q:
Задача 2. (20 баллов) При сжигании 2,40 г органического соединения X в избытке
кислорода выделилось 4,39 г углекислого газа и 1,99 г воды, относительная плотность
которой по водороду 10 . Определите простейшую формулу вещества X. Известно, что
пары вещества X более чем в три раза тяжелее воздуха.
Известно, что молекула вещества \( X \) неполярна, а в реакции вещества X с хлором
образуется только одно монохлорпроизводное.
Определите молекулярную формулу вещества X, предложите структурную формулу
вещества, которая однозначно отражает порядок связей в соединении. Предложите
Q:
Q1- Give reason for the following
1-The Block \( p \) has only six columns?
2-The Block d has only ten columns?
Q:
15 Hydrogen reacts with oxygen in a fuel cell.
The reaction is exothermic.
286 kJ of energy is released for every mole of water formed.
Which volume of hydrogen gas, measured at room temperature and pressure, would react with
oxygen with the release of 7000 J of energy?
\( \begin{array}{llll}\text { A } 587 \mathrm{~cm}^{3} & \text { B } 1175 \mathrm{~cm}^{3} & \text { C } 587 \mathrm{dm}^{3} & \text { D } 1175 \mathrm{dm}^{3}\end{array} \)
Q:
A 49.4 mL sample of a 0.481 M aqueous nitrous acid solution is
titrated with a 0.454 M aqueous solution of sodium hydroxide.
How many millilers of sodium hydroxide must be added to
reach a pH of 3.106 ?
Q:
A 36.3 mL sample of a 0.525 M aqueous hydrofluoric acid
solution is titrated with a 0.221 M aqueous solution of barium
hydroxide. How many milliliters of barium hydroxide must be
added to reach a pH of 2.926 ?
Q:
What is the Lewis Structure for \(NH_ { 4} ^ { + } \)?
Q:
12. จงบอกจำนวนตัวเลขนัยสำคัญ ของจำนวนตัวเลขต่อไปนี้
\( \begin{array}{lll}\text { ก. } 0.00200 & \text { ข. } 6.030 \times 10^{-5} & \text { ค. } 5,000.02 \\ \text { ง. } 8.005 & \text { จ. } 1.00 \times 10^{2} & \text { ฉ. } 16 \times 10^{3}\end{array} \)
Q:
For each of the following pairs of ions, which ion has the larger radius?
(a) \( \mathrm{K}^{+} \)or \( \mathrm{Cl}^{-} \)
(b) \( \mathrm{Sn}^{2+} \) or \( \mathrm{Sn}^{4+} \)
(c) \( \mathrm{Br}^{+} \)or \( \mathrm{Cl}^{-} \)
(d) \( \mathrm{Rb}^{+} \)or \( \mathrm{Sr}^{2+} \)
Q:
For each of the following group 15 elements, indicate the simple ion that is most
expected to form:
(a) N
(b) P
(c) Bi
Q:
A 39.4 mL sample of a 0.398 M aqueous hydrocyanic acid solution is titrated with a 0.248 M aqueous solution of potassium
hydroxide. How many milliliters of potassium hydroxide must be added to reach a pH of 9.096 ?
27.4 mL
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