Which of the following reactions is not a replacement reaction?
fe + cuso4 → feso4 + cu
2na + 2h2o → 2naoh + h2
zn + 2hcl → zncl2 + h2
2na + cl2 → 2nacl

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (use the periodic table as necessary.) group most likely ionic charge # of valence electrons i +1 ii +2 iii +3 iv +4 or -4 v -3 vi -2 vii -1 viii 0

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

Draw the structure for 5-isopropyl-2-methyl-3-nonene