Calculaţi concentraţia procentuală pentru o soluţie obţinută prin adăugarea a 120 apă peste o soluție de 320g saramură de concentrație 40% ?

Concentrations expressed as a percent by mass are useful when the solute is a a. liquid b. gas c. solid

Drag the tiles to the correct locations. each tile can be used more than once, but not all tiles will be used. one or more locations will remain empty. nitrosyl fluoride has the chemical formula nof nitrogen has five valence electrons, oxygen has six, and fluorine has seven. complete the lewis structure for this covalent compound. f n = = = . : : 0 : reset next um. all rights reserved us 2

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products