Zadania z chemii IB SL

Which diagram correctly shows the heterolytic fission of the carbon-bromine bond in bromomethane? A. Diagram A B. Diagram B C. Diagram C D. Diagram D

Which change represents oxidation of the functional group? A. $\ce{CH3COCH3 -> CH3CH(OH)CH3}$ B. $\ce{CH3CH(OH)CH3 -> CH3COCH3}$ C. $\ce{CH3CH2COOH -> CH3CH2CHO}$ D. $\ce{CH3CH=CH2 -> CH3CH2CH3}$

Reduction of which compound gives pentan-2-ol? A. Pentan-2-one B. Pentan-3-one C. Pentanal D. Pentanoic acid

A direct formic acid fuel cell generates electricity by oxidizing formic acid, $\ce{HCOOH}$, with oxygen at the two electrodes, shown below as separate half-equations. Anode: $\ce{HCOOH(aq) -> CO2(g) + 2H+(aq) + 2e-}$ Cathode:…

Which equation represents a propagation step in the radical substitution of ethane by bromine? A. $\ce{Br2 -> 2Br•}$ B. $\ce{•C2H5 + Br• -> C2H5Br}$ C. $\ce{C2H6 + Br• -> C2H5Br + H•}$ D. $\ce{•C2H5 + Br2 -> C2H5Br + Br•}$

Which is a conjugate acid-base pair? A. $\ce{H2CO3}$ / $\ce{CO3^2-}$ B. $\ce{H2SO4}$ / $\ce{SO4^2-}$ C. $\ce{HSO4-}$ / $\ce{SO4^2-}$ D. $\ce{CH3NH3+}$ / $\ce{CH3NH-}$

Which methods for separating the components of the given mixtures are correct? Mixture Method I. Two miscible liquids with boiling points of 56 °C and 118 °C Distillation II. The coloured pigments extracted from a leaf Paper chromatography III. A solid…

Calculate the mass of solid potassium hydroxide that has to be weighed out.

Describe how the student should prepare this standard solution from the weighed solid using a 250.0 $\mathrm{cm^3}$ volumetric flask.