A student has a rectangular block. It is 3.00 cm wide, 400.0 mm tall, and 0.25 m long. It has a mass of 600.0 g. What is the density (g/mL) of the rectangular block? (1cm^3 = 1 mL)

What is the molecular formula of a hydrocarbon with m+ = 166? (write the formula with no subscripts, e.g. c4h10.) what is the sum of rings and double bonds in this compound?

Can someone me with 3 and 4 plz. this is for masteries test.

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?