Zadania z chemii IB SL

Compound Y undergoes nucleophilic substitution with a hydroxide nucleophile. (i) Describe the movement of electron pairs during the reaction using curly arrows. (ii) Contrast homolytic and heterolytic fission of the C–Cl bond in compound Y. (iii) Explain,…

Three orbital shapes, labelled I, II and III, are drawn below. Which row correctly identifies the shapes of a 2s orbital and a 2p orbital? A. 2s: II, 2p: I B. 2s: I, 2p: III C. 2s: I, 2p: II D. 2s: III, 2p: II

When 3.71 g of Z was burned completely in excess oxygen, 8.81 g of carbon dioxide and 4.51 g of water were collected. Determine the empirical formula of Z. Use sections 1 and 7 of the data booklet.

A second sample of Z was converted completely into vapour at a known temperature and pressure. (i) 0.148 g of the vapour occupied 63.7 $\mathrm{cm^3}$ at 110 °C and a pressure of $1.00 \times 10^{5}$ Pa. Calculate the amount, in mol, of Z in this sample. Use…

What is the empirical formula of a compound with the following composition by mass? Element C H O Percentage by mass 54.5 % 9.1 % 36.4 % A. $\ce{C6HO4}$ B. $\ce{C4H8O}$ C. $\ce{C2H4O}$ D. $\ce{C4H8O2}$

How many electrons, at most, can be held in the fifth main energy level ($n = 5$) of an atom? A. 10 B. 25 C. 32 D. 50

90.0 $\mathrm{cm^3}$ of buta-1,3-diene and 150.0 $\mathrm{cm^3}$ of hydrogen are mixed in a container at 450 K and 101 kPa and react to form butane only. Determine the maximum volume of butane that can be formed, measured at the same temperature and pressure.

Determine the total volume of gas present in the container at the end of the reaction described in 5a, under the same conditions of temperature and pressure.