What is the ratio of a compound that contains Ca2+ and O2-?

98 ! and brainliest plz ! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change