What is purpose? A use of an object
B how big or small something is
C how to measure a liquid

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

Compare and contrast physical changes with chemical changes.

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space