Verdadero o falso: a) La fórmula de los compuestos iónicos indica el número real de átomos en la molécula.
b) Las sustancias simples formadas por átomos aislados o por cristales se representan solo por el símbolo de su elemento.

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients

Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants