Jodie is designing an experiment to see if mixing the two liquids below results in a new substance. Jodie pours one liquid into the other and waits to see what happens. Which three things could show Jodie that a chemical change has happened

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.

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?