Perform the following operation and express the answer in
scientific notation.
4.0x105 x 3.0x103
[ ? ]x10 [?]

18. use the activity series to predict whether the following synthesis reaction will occur. write the chemical equations for the reaction if it's predicted to occur. (s) + o2(g) -> *note: it is possible.*

Can someone me with these questions plz.

Adrop of acetone (nail polish remover) has a mass of 35 mg and a density of 0.788 g/cm3. what is its volume in cubic centimeters?