General Chemistry
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TRUE or FALSE. The overall enthalpy change (going from reactants to products) is a factor that affects reaction rates, and endothermic reactions are always slower than exothermic reactions.
An activation energy (Ea) value of 7 kJ/mol was determined for the gas-phase reaction:
HBr (g) + Cl (g) → HCl (g) + Br (g)
Explain why the above reaction has a low value for activation energy.
Describe what happens to the rate of the reaction of H2 and Cl2 in a cylinder with a movable piston when a catalyst is added.
H2 (g) + Cl2 (g) → 2 HCl (g)
Describe what happens to the rate of the reaction of H2 and Cl2 in a cylinder with a movable piston when the temperature is increased at a constant volume.
What effects do temperature, concentration, and surface area have on the rate of a chemical reaction?
Marble is a crystalline form of calcium carbonate (CaCO3) that reacts with hydrochloric acid (HCl) to produce calcium chloride (CaCl2), water, and carbon dioxide (CO2). It is a common observation that marble chunks react slowly with HCl while marble powder reacts quickly. How does the surface area of the reactant (marble) affect the rate of the reaction?
How does the rate of a chemical reaction change when the temperature is decreased?