Which of the changes are physical changes

Why are hypothesis valuable even if it's not supported by data

How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 19.1 moles of water vapor?

Ammonium perchlorate is the solid rocket fuel used by the U. S. Space Shuttle. It reacts with itself to produce nitrogen gas, chlorine gas, oxygen gas, water, and a great deal of energy. What mass of water is produced by the reaction of 9.

What trend does the first ionization energy follow, going down the periodic table? A. The first ionization energy increases because there are more electrons in the atom. O B.

What is the name of CaCl2 7H2o

Tyrell is doing an experiment to find out which evaporates faster-water, liquid soap, or apple juice. To make sure Tyrell experiment is a fair test, he should A. use three containers that are the same size and shape. B.

If an atom of Bromine (Br) becomes an ion, which of the following does it most likely form? a. Br+ b. Br7+ c. Br- d. Br7-

The language of variables

Which of the changes are physical changes

When PCl5 solidifies it forms PCl4 + cations and PCl6 - anions. According to valence bond theory, what hybrid orbitals are used by phosphorus in the PCl4 + cations?