A family decides to use their bicycles to get to the mall on weekends instead of driving a car. How is the family helping the environment? (2 points) HEL

When you perform this reaction, what could remain at the end of the reaction? check all that apply. excess reactant aqueous copper chloride excess reactant aluminum oxygen product solid copper carbon dioxide product aqueous aluminum chloride water

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

Compare and contrast physical changes with chemical changes.