What is the maximum initial reaction rate for this enzyme at pH 7?

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?