Which organism is a producer? A:owl B:mouse C:grass D:snake please somebody help me

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

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.

Amatch has about 21 milligrams of red phosphorus coating the tip. how many atoms of phosphorus is this?