Which observation most likely indicates that only a chemical change has taken place A. States of matter change

B. The change cannot be reversed(my answer)

C. A reaction occurs

D. The shape changes

The reaction q+r2=r2q is found to be first order in r2 and

How many molecules are found in 1.32 mol of nacl?

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit