Which is the best evidence for evolution? A. new rock layers containing fossils of simple organisms.

B. new rock layers containing fossils unlike existing organisms.

C. old rock layers containing fossils different from existing organisms.

D. old rock layers containing fossils of complex organisms.

If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.

How many grams of sodium chloride are in 250ml of a 2.5m naci solution