Zadanie 15
The enthalpy change of the reaction below is calculated from average bond enthalpies. H2(g) + Cl2(g) → 2 HCl(g) Average bond enthalpies: H−H 436 kJ mol−1, Cl−Cl 242 kJ mol−1, H−Cl…
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The enthalpy change of the reaction below is calculated from average bond enthalpies. H2(g) + Cl2(g) → 2 HCl(g) Average bond enthalpies: H−H 436 kJ mol−1, Cl−Cl 242 kJ mol−1, H−Cl…
Which statement about the energy changes in a reaction between covalent molecules is correct? A. The enthalpy change of the reaction equals the sum of the bond enthalpies of the bonds broken minus the sum of the bond enthalpies of the bonds formed B. The…
Which change would decrease the rate of the reaction between zinc and dilute sulfuric acid? Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g) A. increasing the temperature of the acid from 20 °C to 30 °C B. grinding the zinc…
A magnesium hydroxide antacid reacts with hydrochloric acid in the stomach. State a balanced equation for this neutralization.
Two gases react very slowly even at 900 K and a high pressure. Which best explains the low rate of reaction? A. The frequency of collisions between the molecules is low B. A high fraction of the collisions has the correct orientation C. The reaction is…
Which methods could be used to determine the rate of this reaction? CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) I. measuring the decrease in mass of the reaction mixture II. measuring the change in absorbance of light by the solution in a…
Paracetamol and phenacetin are two analgesics with similar structures. Predict, giving a reason, which of the two compounds is more soluble in water.
Excess zinc granules react with 40.0 cm3 of hydrochloric acid of concentration 1.00 mol dm−3 at 25 °C. The volume of hydrogen collected was measured over time and curve I was obtained. The experiment is repeated at the same…
The equilibrium constant for the reaction below is Kc = 280 at 700 K. 2 SO2(g) + O2(g) ⇌ 2 SO3(g) What is the value of the equilibrium constant at 700 K for the following reaction? 6 SO3(g) ⇌ 6 SO2(g) + 3 O2(g) A. B.…
Which pair of changes will both shift the position of equilibrium to the left? CH4(g) + H2O(g) ⇌ CO(g) + 3 H2(g) ΔH = +206 kJ mol−1 A. Decrease the temperature and increase the pressure B. Increase the temperature and increase…