Any change that alters a substance without changing it into another substance.

Which of the following is a wave of water caused by an earthquake under the ocean

Fe3O4 (s) + 4H2 (g) 3Fe (s) + 4H2O (g) Using standard thermodynamic data at 298K, calculate the entropy change for the surroundings when 1.79 moles of Fe3O4 (s) react at standard conditions. S°surroundings = J/K

What is the chemical formula for cerium?

What's the chemical formula for LiCl

Aluminum metal reacts with iron (ii) sulfide to form aluminum sulfide and iron metal. what is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?

Calculate the volume of a 0.323-mol sample of a gas at 265 K and 0.900 atm.

What is the molar mass of the following substance : Cs2CO3

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.