Zadanie 13b
Magnesium hydroxide is used as an antacid to neutralize excess stomach acid, which is hydrochloric acid. Write an equation for the reaction between magnesium hydroxide and hydrochloric acid, including state symbols.
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Magnesium hydroxide is used as an antacid to neutralize excess stomach acid, which is hydrochloric acid. Write an equation for the reaction between magnesium hydroxide and hydrochloric acid, including state symbols.
Which substance is highly volatile in its pure state and gives a solution with high electrical conductivity in water? A. CH3Br B. KBr C. H2S D. HBr
Calcium carbonate is an active ingredient in some antacid tablets. Write an equation, including state symbols, for the reaction of calcium carbonate with the hydrochloric acid in the stomach.
Which changes are exothermic? I. CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) II. Cl(g) + e− → Cl−(g) III. H2O(l) → H2O(g) A. I and II only B. I and III only C. II and III only D. I, II and III
Which of these changes are exothermic? I. N2(g) + 3 H2(g) → 2 NH3(g) II. I2(s) → I2(g) III. H2O(g) → H2O(l) A. I and II only B. I and III only C. II and III only D. I, II and III
Which expression gives the value of ΔH⊖, in kJ, for the formation of one mole of NO2(g) from its elements, ? A. −180 + 114 B. 0.5 × (−180) + 0.5 × 114 C. 0.5 × 180 − 0.5 × 114 D. 0.5 × 180 + 0.5 × 114
Which calculation gives the standard enthalpy change of formation of nitrogen monoxide, in kJ, from the data below? A. (+66) + (−114) B. 0.5 × (+66) + 0.5 × (−114) C. (+66) − (−114) D. 0.5 × (+66) − 0.5 × (−114)
The diagram shows the enthalpy profile of an exothermic reaction. Arrows I, II and III show energy differences on the profile. Which expression gives ΔH for the forward reaction? A. II − I B. I − II C. I + II D. III − II
Which expression gives the enthalpy change, ΔH, of the forward reaction shown in the enthalpy profile? A. II − I B. I − II C. I − III D. III − II
Which statement correctly explains why a reaction is faster when a catalyst provides an alternative reaction pathway? A. It raises the average kinetic energy of the reacting particles. B. It lowers the activation energy, so a greater proportion of collisions…