Question: a spatula with 05 g of unknown metal w x...
A spatula with 0.5 g of unknown metal W, X, Y and Z, each can either be Cu, Sn, Zn or Ca, was respectively added to a test tube containing 5 ml of hydrochloric acid (HCl) at a concentration of 1 M. The following was observed:
|W||Air bubbles were released consistently from the metal|
|Y||Air bubbles were seen slowly emerging from the metal after 5 minutes|
|Z||Air bubbles were released aggressively as soon as the metal came into contact with HCl|
a. Based on the observations, determine the identity of each of the metal. (1 mark)
b. After 30 minutes, the volume of metal W was observed to have decreased and the air bubbles stopped forming. Explain why by showing your calculations. (4 marks)