question1

5 g of calcium carbonate takes 250 s to react with hydrochloric acid completely. What is the average

rate of the reaction?(Relative atomic masses: C = 12.0, O = 16.0, Ca = 40.1)

question2

Which of the following statements about using titrimetric analysis to follow the progress of a reaction is/are correct?

(1) It involves performing titration to determine the concentration of either a reactant or a product.

(2) The reaction does not need to be quenched.

(3) It is a continuous monitoring of the progress of the reaction.

A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only

question3

Consider the following four reactions:

(1) Reaction between 3.0 g of Mg granules and 1.0 M of CH3COOH at room temperature

(2) Reaction between 3.0 g of Mg powder and 1.0 M of HCl in a warm water bath

(3) Reaction between 3.0 g of Mg powder and 0.6 M of H2SO4 in a warm water bath

(4) Reaction between 2.0 g of Mg granules and 0.9 M of CH3COOH at room temperature

Which of the following is the descending order of the rates of the above reactions?

A. (1) > (3) > (4) > (2) B. (2) > (3) > (4) > (1) C. (2) > (4) > (1) > (3) D. (3) > (2) > (1) > (4)