Select all the apply to the indicator phenolphthalein
-is pink in acid solution
- it provides a visual signal that a solution has changed from acid to a base
- is pink in base solution
-is colorless in acid solution
-is colorless in base solution

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base

Consider this initial-rate data at a certain temperature for the reaction described by

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange