How can you tell if the object is an element?

How can you tell if a substance is a compound?

What are the common elements found in Earth's oceans?

What are the most common elements found in Earth's Crust?

What are the most common elements found in Earth's Atmosphere?

What are the most common elements found in living organisms?

What happens during a chemical change?

Which of the following is evidence of a chemical change?

CO2 is considered a ...

Na is considered

Which substance is an element?

Which substance is a compound

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