if the train raises the volume of its horn by a factor of 2.5, how many decibels does it increase by?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Imagine that twenty i.u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?

What does the xylem do? stores the glucose captures the sunlight absorbs oxygen into the leaf carries water from the roots to the leaves