A sample of an unknown substance has a volume that is independent of its container. Which additional information is needed to determine the state of the sample?
A. whether the sample conducts electricity

B. the density of the sample

C. whether the sample has a fixed shape

D. the mass of the sample

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

In 2002, the rare earth elements mine in mountain pass, california was closed because