Zadanie 11
Which molecule is the most polar? A. CO2 B. CCl4 C. H2S D. H2O
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Which molecule is the most polar? A. CO2 B. CCl4 C. H2S D. H2O
What is the name of the compound with the formula Cr2(SO4)3? A. Chromium sulfate B. Chromium(II) sulfate C. Chromium(III) sulfate D. Chromium(VI) sulfate
What is the main attraction between molecules in liquid carbon tetrachloride, CCl4? A. Hydrogen bonding B. Ionic attraction C. Dipole–dipole forces D. London (dispersion) forces
Burning 0.500 g of propan-1-ol, CH3CH2CH2OH, heats 200 g of water by 12.4 K. Specific heat capacity of water: 4.18 J g−1 K−1. What is the enthalpy of combustion of propan-1-ol, in…
Which change is exothermic? A. Cl2(g) → 2 Cl(g) B. H2O(l) → H2O(g) C. CH4(g) → C(g) + 4 H(g) D. H(g) + Br(g) → HBr(g)
The enthalpy changes of two reactions of nitrogen oxides are given. N2(g) + O2(g) → 2 NO(g) ΔH = +180 kJ 2 NO2(g) → 2 NO(g) + O2(g) ΔH = +114 kJ What is the enthalpy change, in kJ, of the following reaction?…
Which combination of ΔH1, ΔH2 and ΔH3 gives the enthalpy change of the reaction below? C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l) ΔH1: C(s) + O2(g) → CO2(g) ΔH2: …
The potential energy profile of a reaction is shown. Which statement correctly describes the reaction? A. Endothermic; the products have a lower potential energy than the reactants B. Endothermic; the products are less stable than the reactants C. Exothermic;…
Identical pieces of zinc, each of mass 0.65 g, are added to two solutions of hydrochloric acid, X and Y, at the same initial temperature. Each reaction takes place in an identical insulated container and the mixture is stirred. Which statement is…
Excess calcium carbonate reacts with 25 cm3 of hydrochloric acid of concentration 1.0 mol dm−3 in an open flask. The solid line shows how the decrease in mass of the flask and its contents changes with time. The experiment is…