Zadania z chemii IB SL

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A section of a polymer containing three repeating units is shown. Which monomer was used to make this polymer? A. 1,1-dichloroethene B. Chloroethene C. 1,2-dichloroethene D. 3-chloroprop-1-ene

łatwe (szac.)

What are the oxidation states of the elements in $\ce{K2MnO4}$ ? A. K: +1, Mn: +6, O: −2 B. K: +1, Mn: +7, O: −2 C. K: +2, Mn: +4, O: −2 D. K: +1, Mn: +6, O: −1

What is the IUPAC name of the compound shown? A. 3-methylhexan-4-one B. 4-methylhexan-3-one C. 4-ethylpentan-3-one D. 2-ethylpentan-3-one

The first ionization energies of four elements with consecutive atomic numbers, A, B, C and D, are shown. An element X reacts with oxygen to form an acidic oxide. Which element could be X? A. A B. B C. C D. D

Which formula represents an amide? A. $\ce{CH3CH2NH2}$ B. $\ce{CH3CH2CONH2}$ C. $\ce{(C2H5)2NH}$ D. $\ce{H2NCH2CH2COOH}$

The potential energy profile of a reaction is shown. Which reaction has this energy profile? A. $\ce{Cl2(g) -> 2Cl(g)}$ B. $\ce{CaCO3(s) -> CaO(s) + CO2(g)}$ C. $\ce{N2O4(g) -> 2NO2(g)}$ D. $\ce{2Mg(s) + O2(g) -> 2MgO(s)}$

What is $\Delta H$ , in kJ, in the energy cycle below? A. +20 - 165 B. +20 + 165 C. -20 + 165 D. -20 - 165

Which statement best describes an environmental consequence of using fossil fuels? A. The carbon dioxide released is completely absorbed by the oceans, so its concentration in the atmosphere does not change. B. Coal has a higher hydrogen to carbon ratio than…

Equal volumes of the gases $\ce{Q2}$ and $\ce{R2}$ are mixed in a sealed container and react until one of them is used up, forming the gas $\ce{QR2}$ . The volume of $\ce{QR2}$ formed, measured under the same conditions, is 50 $\mathrm{cm^3}$ .…

What volume of hydrogen, in $\mathrm{cm^3}$ , is produced at STP when 0.810 g of aluminium reacts with an excess of hydrochloric acid? $\ce{2Al(s) + 6HCl(aq) -> 2AlCl3(aq) + 3H2(g)}$ Molar volume of an ideal gas at STP = 22.7 $\mathrm{dm^3\,mol^{-1}}$ A. 341 B.…