In a scientific investigation, the term "quantitative data" refers to numbers that are usually followed by by what?

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In a scientific investigation, the term "quantitative data" refers to numbers that are usually followed by by what?

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Answer 1 · 2018-05-11T05:15:47

$....blocks of flats....?$ $"....blocks of flats....?"$

Explanation:

No... $quantitative data$ $"quantitative data"$ are always reported with the $appropriate units.$ $"appropriate units."$

Sometimes the use of units can help you in a chemical calculations. We know that $concentration$ $"concentration"$ has units of $amount of stuff per unit volume$ $"amount of stuff per unit volume"$ ...

And so for concentration, we would generally take the quotient...

$Concentration = \frac{Moles (or mass) of stuff}{Volume of solution}$ $"Concentration"="Moles (or mass) of stuff"/"Volume of solution"$

..units of $m o l \cdot L^{- 1}$ $mol*L^-1$ apply.....

And when we want to convert a concentration term into a mass of mole quantity, given a specific volume we take the product such that WE GET UNITS of moles in the final answer...

$How many moles in$ $"How many moles in"$ $0.500 \cdot L$ $0.500*L$ $1.0 \cdot m o l \cdot L^{- 1}$ $1.0*mol*L^-1$ $H C l$ $HCl$ ?

$n_"HCl"=0.500*cancelLxx1.0*mol*cancel(L^-1)=0.50*mol$

When the units DO NOT cancel out, you know you have made a balls-up, which are all too easy to do, and why else go thru the bother of including units in our calculations? And note that this approach works for fyzics too.... $F=ma$ etc...

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In a scientific investigation, the term "quantitative data" refers to numbers that are usually followed by by what?

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