A jar contains a certain substance. Which observation would show that the substance must be either a solid or a liquid

Match each object to its description: a. coma of a comet b. comet tail c. oort cloud haze surrounding a nucleus created by solar wind. hypothetical sphere around the solar system

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution