If i am going to be honest with you ,in my own humble opinion without being sentimental of course, without offending anyone who thinks differently from my own point of view,but also by looking into this matter in distinctive perspective i would like to say i have nothing to say
PV = nRT, or (pressure)(volume) = (amount of gas)(universal gas constant)(temperature)
<span>You're solving for pressure, so start by rearranging the equation: </span>
<span>p = (nRT)/V </span>
<span>You're given temperature; all you need to do is convert it to Kelvin. (The universal gas constant is 8.31 J/(Kmol), so the units for temperature need to be the same.) </span>
<span>But how to figure out the rest? The question doesn't give you the size of the flask or number of moles, but it does tell you that these things don't change throughout the problem. Because they're constant, we don't have to know exactly what they are - we just have to know the *combined values* of the constants. (If this is confusing, think about it this way: a small amount of gas in a small flask will exert the same amount of pressure as a large amount of gas in a large flask, as long as the ratios are kept equal - it doesn't matter if it's 2 moles in 2 L, or 1 mole in 1 L.) </span>
<span>To figure out this constant, go back to the opening, where you're given temperature and pressure. </span>
<span>pV = nRT </span>
<span>Remember to convert celsius to kelvin! </span>
<span>(254mm Hg)(V) = nR(330K) </span>
Chemical change can be determined when a substance change it's state of composition and is irreversible. Five evidences that chemical change has occured are, color change, formation of a precipitate, formation of gas, odor change, temperature change. Examples of chemical change are, combustion reactions, rusting iron, precipitate of AgCl.
Genetically alter the DNA of a plant to produce a desired trait.
