Why is melting a physical property of the wax of a candle, but flammability is a chemical property?

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.

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion

What is the volume of 2.5 moles of nitrogen gas (n2)at standard temperature and pressure (stp)?