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Chromatography can be used to determine the RF value of an unknown substance. This RF value when cross-referenced with already known RF values can then be used as a guide to find out a potential range of ...

We know there are 6525 more women than men. We can deduce that 5 'parts' = 6525 as 11-6=5If 5 parts = 6525. 1 part = 6525/5 = 1305.We know that 4 parts are children so, 1305 * 4 = 5220Alternatively, once ...

First identify which unknown has the same coefficient. In this case it is y.Either add or subtract the two equations to eliminate y. In this case we subtract one equation from the other (can be either). 3...

The chlorine atom is smaller than the iodine atom therefore its 7 outer electrons are closer to the nucleus than the 7 outer electrons in iodine. In turn, this means the positively charged chlorine nucleu...

Right angle means use Pythagorus:
a² + b² = c²
thereforea² = c² - b² = 7² - 4² = 49-16 ...