What will happen if we conduct the experiments below: 1) In a solution NaOH we add phenolophthalein and later we add HCl.

2) In a vinegar solution we add soda.

3) In a HCl solution we add an amount of copper.​

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and explain your predictions. how does temperature affect the spontaneity of this process?

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as