Identify indicators of a chemical reaction. Check all of the boxes that apply. Two clear liquids are combined. A green solid forms. color change absorption of heat formation of precipitate formation of gas

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

What is the value of the standard enthalpy of formation of an element in its most stable form?