PLEASE HELP Referring to the energy diagram below which arrow segment represents the activation
energy of this reaction?

O Arrow B
O Arrow D
O Arrow A
O Arrow C

Can someone me with 1 to 4 plz. fast

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?