An element A combines with fluorine to form an ionic compound having the formula AF3. What is the formula of the ionic compound formed between sulfur and A?

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

How do dying stars contribute to the formation of planets