You discover that an atom of an unknown element has 54 protons, Identify the element and explain how you know the identity is correct
Explain whether the unknown element is more or less reactive than an atom of an element that has 30 protons,
Identify an element that would have very similar chemical properties to the unknown element and explain why its chemical properties would be similar

If a gas has an initial pressure of 101kpa and a volume of 10l, then it expands to a volume of 20l, what is the new pressure?

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 !

If a solution contains 3 moles/liter of sodium chloride (nacl, made of sodium ions and chloride ions), what is the osmolarity of this solution