Zadania z chemii IB SL

Pentan-2-ol can form by reacting pent-1-ene with water in the presence of an acid catalyst. $\ce{CH2=CHCH2CH2CH3(g) + H2O(l) -> CH3CH(OH)CH2CH2CH3(aq)}$ $\Delta H^\ominus = -84\ \mathrm{kJ\,mol^{-1}}$ (i) Explain why increasing the temperature would increase…

Pentan-2-ol will react with acidified potassium dichromate, $\ce{K2Cr2O7}$, which is an oxidizing agent. State the name of the product of this reaction.

How many ions are present in 142 g of $\ce{Na2SO4}$? $M(\ce{Na2SO4}) = 142\ \mathrm{g\,mol^{-1}}$ A. 1 B. 3 C. $6.02 \times 10^{23}$ D. $1.81 \times 10^{24}$

Calculate the pH of a 0.125 mol dm$^{-3}$ solution of sodium hydroxide.

A sample of the sodium hydroxide solution is gradually added to 25.0 cm$^3$ of an aqueous solution of an unknown organic acid, producing the following pH curve. Calculate the concentration of the unknown organic acid.

What is the empirical formula of an alcohol with 60.0 % mass carbon and 13.4 % mass hydrogen? A. $\ce{C3H7}$ B. $\ce{C6H16O2}$ C. $\ce{C3H8O}$ D. $\ce{C2H6O}$

What is the correct formula of calcium phosphide? A. $\ce{Ca3P2}$ B. $\ce{Ca2P3}$ C. $\ce{CaPO4}$ D. $\ce{Ca3(PO4)2}$

Which properties are expected for the compound lithium bromide? A. Not soluble in water, low melting point, does not conduct electricity when solid, does not conduct electricity when molten B. Not soluble in water, low melting point, conducts electricity when…

What is the correct electron domain geometry and molecular geometry of $\ce{NCl3}$? A. Trigonal planar electron domain geometry, trigonal planar molecular geometry B. Tetrahedral electron domain geometry, trigonal pyramidal molecular geometry C. Trigonal…