Earths core is mostly made up of iron and magnesium true or false

Compare and contrast physical changes with chemical changes.

Geothermal energy for industrial use is available almost anywhere. a.true b.false

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?