Question

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

Answer 1

`"....blocks of flats....?"`

Explanation:

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

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

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

`"Concentration"="Moles (or mass) of stuff"/"Volume of solution"`

..units of `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"` `0.500*L` `1.0*mol*L^-1` `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...