Suppose you have an internet friend who study chemistry just like you are your friend claims the change from liquid water to water vapor is a chemical change write a brief email that might convince your friends otherwise

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

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?