Which processes represent one chemical change in one physical change

An unknown sample weighing 28.26g contain 70% of hydrogen and 30% of carbon calculate the [1]empirical formula [2]the molecular formula [3]give the iupac name of the compound

An aqueous solution of sodium hydroxide containing 2g in 200cm^3 of solution has a concentration of (NaOH = 40). answer in mol/dm^3

Predict products or C3H8 + O2 via combustion

Cabbage Juice pH Chart pH Color 2 Red 4 Purple 6 Violet 8 Blue 10 Blue-Green 12 Green The juice from red cabbage is a well known pH indicator solution.

What are the constituent element of potassium sorbate?

Hat information is needed to determine the energy of an electron in a many-electron atom?

Write the formulas for the following compounds: (a) copper (l) cyanide, (b) strontium chlorite, (c) perbromic acid, (d) hydroiodic acid, (e) disodium ammonium phosphate, (f) potassium dihydrogen phosphate, (g) iodine heptafluoride, (h)

Name a complex salt used in silver-playing.

10. In what part of the world might you find Mystery Island (note: you will be given full-credit for simply attempting this question and you will find the actual answer in your teacher's feedback). Do not answer!

What are the spectator ions in this equation?