Which are isotopes? an atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has?

What methods do scientists use to determine if a change was physical or chemical?

I in the blanks. The solid substance left on the filter paper is called

What is an energy sublevel

Which is not one of the main areas of Earth science? 1. geology 2. oceanography 3. meteorology 4. anthropology

If 3.0 grams of H2 were produced from the following reaction, how many grams of Al reacted? 2AI + 6HCI - -->2AIC3 + 3H2 Note the following: molar mass of Al = 27 g/mol molar mass of H = 1.0 g/mol molar mass of Cl = 35.5 g/mol

What is sediment and debris, and what role does it play in the way sedimentary rock forms?

How do I convert 4,500mm to a m

A substance that permits the flow of electrons is a (n a. conductor b. insulator

The volume, in liters, of 538 g of CO2

9.86 x 10²⁸ O-atoms require what volume (L) N₂O₂ at STP?