For a concentration technique, stotal is given as 19.31 ± 0.035, smb is 0.22 ± 0.008, and ka is 0.154 ± 0.007 ppm–1, where stotal is the signal, ka is the method’s sensitivity for the analyte and smb is the signal from the method blank. if we want the overall percent uncertainty to be 2.6%, which statement is false below?
group of answer choices:
a. improving the signal’s uncertainty will improve the overall uncertainty
b. uncertainty in the method’s sensitivity dominates the overall uncertainty
c. we must improve the uncertainty in ka to ±0.004 ppm–1
d. none of the above

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.