A large car manufacturer is suspected of polluting the water supply of your town. You know the company uses aqueous lead (Pb4+(aq)) in its factory and you have a hunch that somehow this lead is finding its way into the groundwater. You have a sample of groundwater taken from a site near the property of the plant. Any aqueous lead can be removed if it forms a precipitation with an appropriate anion. How could you go about removing lead from the sample of groundwater? Identify an anion that could be used to remove any Pb4+(aq) ions. Write down the net ionic equation of the reaction that would take place.

they are made of gases.

they have a spherical shape.

they make energy through fusion.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.