Zadania z chemii IB HL

Which of these molecules are isomers of each other? I. Butanal II. 2-methylpropan-1-ol III. Butan-2-ol A. I and II only B. I and III only C. II and III only D. I, II and III

The table shows the observed colour of three octahedral complex ions formed by the same metal ion, $\ce{M^{2+}}$, with different ligands. Complex ion Colour of complex $\ce{[MF6]^4-}$ green $\ce{[M(H2O)6]^2+}$ blue $\ce{[M(NH3)6]^2+}$ yellow Which statement…

Which molecules exhibit cis-trans isomerism? I. Pent-2-ene II. 1,1-dichloroethene III. 1,2-dibromoethene A. I and II only B. I and III only C. II and III only D. I, II and III

Which compound could produce this mass spectrum? Mass lost (Mr) Possible neutral fragment lost 15 •CH3 18 H2O 28 CH2=CH2 or CO 29 •CH2CH3 or •CHO 45 •COOH A. Butanone B. Butanal C. Butan-1-ol D. Butan-2-ol

Which classification is correct for this reaction? $\ce{2Mg(s) + CO2(g) -> 2MgO(s) + C(s)}$, heat is released A. Endothermic; temperature decreases; reactants more stable B. Exothermic; temperature decreases; products more stable C. Exothermic; temperature…

What is the sum of the coefficients when this equation is balanced with the smallest whole numbers? $\ce{\_CH3CH(CH3)CH2CH2CH3 + \_O2 -> \_CO2 + \_H2O}$ A. 20 B. 37 C. 47 D. 53

Given the following data: $\ce{CaO(s) + CO2(g) -> CaCO3(s)}$ $\Delta H = -p\ \mathrm{kJ}$ $\ce{2Ca(s) + O2(g) -> 2CaO(s)}$ $\Delta H = -q\ \mathrm{kJ}$ $\ce{2CaCO3(s) -> 2Ca(s) + 2C(s) + 3O2(g)}$ $\Delta H = +r\ \mathrm{kJ}$ What is the $\Delta H$ of the…

In which reaction will there be a decrease in entropy? A. $\ce{NH4NO3(s) -> NH4NO3(aq)}$ B. $\ce{CaCO3(s) -> CaO(s) + CO2(g)}$ C. $\ce{2H2(g) + O2(g) -> 2H2O(l)}$ D. $\ce{Zn(s) + CuSO4(aq) -> ZnSO4(aq) + Cu(s)}$