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Evaluation, Measurement and Research Methods

The Lead concentrations in water

I'm in dire need of help with a reaserch project asap My hypothesis is: The lead concentrations in water travelling through lead pipes is greater when the taps are first opened than after they have ran for some time My problem is 1. when can i expect the concentrations to lower so i can be more specific in my hypothes

Research study

What is necessary to establish a causal relationship? Briefly explain how I would set up a research study to determine that a reduction in lean body mass is causing a decrease in max VO2. (I am assuming that part of it could be that if there is a decrease in lean body mass there is less oxygen required)

Place value name

The mass of hydrogen atom= 1.7*10x-24 0.0000000000000000000000017g now what I need is: The PLACE VALUE NAME example:(sextillionths grams)