12 g of commercial zinc is made to react with excess dilute H2SO4 .The total volume of hydrogen gas liberated was found to be 4.2 litres at 520 mmHg pressure and 279 K. Determine the percentage purity of the zinc.

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol