# Tutor profile: Merett S.

## Questions

### Subject: Chemistry

N2O is placed in a piston. Initially the volume of the piston is 3.0 L, and the pressure of the gas is 5.0 atm. The piston is used to compress the gas to a volume of 1.5 L; determine the pressure of the N2O.

- Write out what is given Given: 1. Initial: V=3L P=5 atm 2. Final: V=1.5L P= ? atm (this is what we are trying to find) Assume: number of molecules and temp are constant. When we write our given, we can determine which equation to use to solve. Using notes, I see boyle's law p1v1=p2v2 Rearraging to solve fot p2 (p1v1)/v2= (3L*5 atm) / 1.5L = 10atm. notice that prssure and volume are inversely proportional. Increase one means decrease the other by the same factor.

### Subject: Biochemistry

Why is water biologically important?

-Cell life: water carries nutrients within cells. Our blood is 92% water - acts as a universal solvent -acts as a neutral solvent, can act as an acid (H+) or a base (OH-). It is needed ofr most metabolic reactions. -most chemical reactions depend on H+ movement to produce ATP that gives us energy -forms covalent bonds to stabilize intermediates in reactions - higher boiling point allows for stable heat transfer.

### Subject: Algebra

10^x= 100 solve for X

this is asking us to reverse the exponent. What exponent value would give us 100. To solve we use a logarithm. This is how we reverse exponents. log, (base 10), 100 = x 10 is the base of the exponent so it will always be on the bottom of the log. (base goes to base) Then we have a choice between 100 and x. We want x by itself on the opposite side of the equal sign since thats what we are solving. therefore, we get log, (base 10), 100 = x

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