How do you know when the reaction between baking soda and an acid ingredient has ended

9. write the chemical equation for the following word equations. include symbols for physical states in the equation. a. solid zinc sulfide + oxygen gas -> solid zinc oxide + sulfur dioxide gas b. aqueous hydrochloric acid + aqueous barium hydroxide -> aqueous barium chloride + water

Which substance can be broken down by chemical means

Which item is most likely part of the safety contract