Subtances have a definite and unchanging chemical composition. Example of Subtances are salt, water, baking soda, Carbon dioxide and oxygen. They are subtances because their composition is?​

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

The element that has the greatest electronegativity is

Need ! asap will mark 10 pts using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers