which is a greater change than we saw with the addition of any other reagent."
Similarly, we don't write that we believe something. We present the evidence, and perhaps suggest strong support for a position, but beliefs don't come into play. In particular, we do not "expect" a particular set of results, or "wire" a hypothesis so that it appears that we correctly predicted the results. That sort of practice is another example of lack of objectivity.
Proof
See my essay on fact, hypothesis, and theory. The requirements for scientific proof are extremely rigorous. It is highly doubtful that any single experiment can be so well controlled that its conclusions can be regarded as proof. In fact, for any result to be accepted it must be confirmed independently. In fact, we can never know if a model as we describe it presents an accurate picture of any natural process. We can never look at the original blueprint to check our conclusions. So... your data may strongly support a position, or they may allow you to reject a hypothesis, but they aren't likely to provide anything close to proof.
Grammar and spelling
Please avoid obvious grammatical errors. Granted, you aren't writing an English paper (heck, an English teacher would tear my own writing style to shreds). However, clear written communication requires proper sentence structure and use of words. Make sure that your sentences are complete, that they make sense when you proofread, and that you have verb/subject agreement.
Spelling errors in a paper make you look amateurish. For example, absorbance is read from a spectrophotometer. You don't read absorbencyfrom a spectrometer. Worse, they can change the entire meaning of your writing. One letter changes the chemical compound you describe. I know the action of cycloheximide in eukaryotic cells, but I do not know the action of cyclohexamide.
Inaccurate word or phrase
Changing temperature had the following affect on the subject.
'Affect' is a verb. 'Effect' is a noun. What happened to the subject was an effect. The temperature change affected the subject. Please learn the difference.