What is a useful technology developed from scientific observations on the nano- scale? A. the photometer
B. carbon nano-tube for stain resistant clothes
C. Kepler telescope

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.