Does observing a physical property of a substance change the identity of the substance? Explain.

What is the pH when 5.0 mL of 0.010 M barium hydroxide is added to 20.0 mL of 0.020 M nitric acid 12.08 1.92 12.15 1.85

What is the energy of a photon of blue light with a frequency of 6.7 x 1014 Hz? 6.626 x 10-34 Js 9.9 x 10-49 J 4.4 x 10-19 J 1.0 x 1048 J

1.) How many unpaired electrons are there in the Fe3 + ion when it is in its ground state? 2.) Which of these ions have noble gas electron configurations? (Give the electron configuration of each ion.) Cr3+ Al3+ Se2- 3.

Give the name of this chemical formula, KMnO4. A) potassium permangante B) phosphorus permanganate C) phosphorus permanganide Eliminate D) potassium manganese oxide

When calcium hydroxide reacts with sulphuric acid in the lake a calcium salt is formed what is the name of this salt

The atomic mass of carbon is 12.011 g/mol. how many atoms of carbon have that exact mass? why?

Which option is true about the effect of polarity on solubility? Select all that apply. Polar solutes dissolve better in water than in oil. Polar solutes have the greatest solubility in nonpolar solvents.

Which change results in a release of energy? 1. The melting of H₂O (S) 2. The boiling of water (L) 3. The evaporation of H₂0 (L) 4. The condensation of H₂0 (G)

What changes nitrogen gas in the air to nitrogen compounds that fall to the ground

Which element has an isotope mass number of 32 and is used as an ecological tracer?