Which value changes when a Cu atom becomes a Cu2+ ion? 1.
mass number
2.
oxidation number
3
number of protons
4.
number of neutrons

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !

Is the idea of spontaneous generation supported by redi's experiment? justify your answer in 2-3 sentences?