1.he expression for the rate law may be written in the general form as shown below. Experimental evidence indicates that for a particular reaction, m=2 and n=1/2. What is the overall order of the reaction?
2.Magnesium metal reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas. Which set of condition produces hydrogen gas at the fastest rate.
a 1.0 gram strip of Mg(s) is 25 ml of 0.5 mol/L HCl(aq) at 25C
a 1.0 gram strip of Mg(s) is 25 ml of 0.5 mol/L HCl(aq) at 35C
1.0 gram of powdered Mg(s) is 25 ml of 0.5 mol/L HCl(aq) at 25C
1.0 gram of powdered Mg(s) is 25 ml of 0.5 mol/L HCl(aq) at 35C
3.For a reaction in aqueous solution, an increase in the concentration of the reactant(s) increases the rate of reaction because
the potential energy of the chemical bonds is decreasesed.
there are more collisions between reactant particles.
the intermolecular attractions between water and aqueous ions increase.
the kinetic energy of the reactant particles increases.
a greater percentage of the aqueous ions have energy equal to or in excess of the activation energy.
4.Without enzymes, many chemical reactions would not occur or be too slow to be useful. What are enzymes?
chemicals that increase surface area
molecules used to increase kinetic energy
5. Use the given equations to determine the enthalpy change for the reaction below
Image transcription text
2503(g) - 2502(g) + 02(g) (1) S(s) + 02(g) - SO2(g) AH comb = -296.8 kJ (2) S(s) + 02(g) - SO;(g) AHcomb = -395.7 kJ
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