Zadania z chemii IB HL

Which combination is correct for this cell, when nickel is more reactive than silver? A. Cathode: silver; anode: nickel; sign on cathode: -; sign on anode: + B. Cathode: nickel; anode: silver; sign on cathode: -; sign on anode: + C. Cathode: nickel; anode:…

Which products are produced at the electrodes by the electrolysis of aqueous sodium iodide? A. Product at cathode: sodium; product at anode: iodine B. Product at cathode: hydrogen; product at anode: iodine C. Product at cathode: iodine; product at anode:…

Which statement explains the Lewis acid-base nature of the carbocation in this reaction? $\ce{C2H5+ + I- -> C2H5I}$ A. Lewis base because it accepts a pair of electrons B. Lewis base because it donates a pair of electrons C. Lewis acid because it donates a…

Which equation shows the first species acting as an electrophile? A. $\ce{Br- + CH3CH2+ -> CH3CH2Br}$ B. $\ce{H2O + H+ -> H3O+}$ C. $\ce{CN- + CH3Br -> CH3CN + Br-}$ D. $\ce{AlCl3 + Cl- -> AlCl4-}$

What can react with benzene to produce nitrobenzene? A. $\ce{NO2}$ B. $\ce{NO3-}$ C. $\ce{NO2+}$ D. $\ce{NO+}$

Which reaction will be fastest when a halogen is substituted by aqueous hydroxide ions? A. $\ce{(CH3)2C(F)CH2CH2CH3}$ B. $\ce{(CH3)2C(Cl)CH2CH2CH3}$ C. $\ce{(CH3)2C(Br)CH2CH2CH3}$ D. $\ce{(CH3)2C(I)CH2CH2CH3}$

What is the charge on this complex ion of chromium(III), $\ce{[Cr(H2O)4Cl2]^{x}}$? A. 1+ B. 3+ C. 5+ D. 1-

A beam containing protons, neutrons and electrons is passed between two charged metal plates. The three paths observed are labelled P, Q and R. Which row correctly identifies the particle following each path? A. P: electron, Q: proton, R: neutron B. P: proton,…

Determine the mass of sodium thiosulfate pentahydrate, $\ce{Na2S2O3 * 5H2O}$, needed to prepare 250.0 $\mathrm{cm^3}$ of a 0.2000 $\mathrm{mol\,dm^{-3}}$ solution.