Fluorine is a reactive nonmetal in the Halogen group. What other elements below are also likely to be reactive like fluorine? a Chlorine and Neon
b Bromine and Xenon
c Lithium and Argon
d Chlorine and Bromine

An observation that requires measurement is called quantitative observable or qualitative

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

Precision can be defined as the o exact center of a data set. o reproducibility of a measured value. o correlation between two variables that are measured in a data set agreement between a measured value and an accepted value.