Which of the following equations is balanced correctly and has the correct products for the reactants rbno3 and bef2? 3rbno3 + 3bef2 → be(no3)3 + 3rbf, because be increases in charge from 2+ to 3+ when it is replaced 2rbno3 + bef2 → be(no3)2 + 2rbf, because be keeps a 2+ charge throughout the reaction rbno3 + bef2 → beno3 + rbf2, because be keeps a 1+ charge throughout the reaction 2rbno3 + bef2 → be(no3)2 + 2rbf, because be increases in charge from 1+ to 2+ when it is replaced

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.