A lemon juice cleans a penny. I believe this to be the answer because the lemon cleans the penny but no molecules change
I think it's DNA forms a double helix and RNA consists a single strand.
I may be wrong...
Your answer is C. Both gasoline and litter would need to be physically separated from the water, because neither bonds with the water.
Fluorine 20 (F - Atomic number 9 and atomic mass 20). Firstly we need to know what is beta decay. Beta decay occurs when one neutron changes into a proton and an electron therefore the atomic mass will remain the same as even though we loose a neutron it is replaced by a proton, the atomic number is always raised by 1 when one beta decay occurs. The produced electron is shot out of the nucleus at an incredible speed. This speedy electron we call a beta particle.
Ok now the reaction.
20 20 0
F -> Ne + e
9 10 -1
Remember the atomic number determines the nature of the element ( i.e what elemnt it is).
Hope this helps :).
