With 3 true/false questions for chem ! (just needs revision! )

1. the oxidation number of an atom of a free element is always 1.
true
false (i believe it's false)

2. an electrolytic cell uses electric current to drive a non-spontaneous chemical reaction; but, a voltaic reaction is spontaneous and does not require electric current to proceed.
true
false
(^ not sure about this one)

3. in a reaction, oxidation can occur independently of reduction.
true (i think its true)
false

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

Are oil and water a mixture or solution