The rate constant at 428° C is measured to be k=2.57. At 622°C, k= 567. Find the activation energy
use R = 8.31 and make sure temps are in Kelvin before using

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.