Which of the following statements is true of enzymes ???

A. they change shape after a reaction

B. They don’t provide an active site for substrates to bind in a reaction

C. They’re unusable after a reaction

D. They act on a specific type of substrate in a reaction

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. an industrial chemist studying this reaction fills a 25.0l tank with 4.5 mol of sulfur dioxide gas and 4.5 mol of oxygen gas at 30.°c. he then raises the temperature, and when the mixture has come to equilibrium measures the amount of sulfur trioxide gas to be 1.4 mol. calculate the concentration equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. round your answer to 2 significant digits.

Why do lunar and solar eclipse not happen every month