You are told that a solution may contain Pb2+ and/or Sr2+. a. How might a flame test show the presence of these ions? For each one, what
would be observed if it was present?

b. How could a precipitate test be used to determine their presence? Describe the steps that would need to be taken. Ensure you include the solutions you use for your tests.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

the answer is a for sure mark brainliest i had got this right on usatestprep