Which question cannot be answered using scientific methods?

what is the ph of a hydrochloric acid solution?
is sodium hydroxide an acid or a base?
can acids and bases react chemically?
which is the most interesting acid?

The density of glycerin is 1.26grams/centimeter cubed . how many is this? use the conversion rates of and . express your answer to the correct number of significant figures.

Five students had to answer the question how are elements arranged in a periodic tabledamon: i think the elements are arranged by increasing massflo: i think the elements are arranged according to their properties sienna: i think the elements are arranged by when their discovers kyle: i think the elements are arranged according to how common they areglenda: i don't agree with any of themwho is right

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )