Staley P.S. Test 8/19

Front

What is rule # 1 in the lab?

Back

No Talking

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What does a compound always have?

Back

A chemical formula.

Front

What are all elements made of?

Back

Atoms.

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, e.g., rusting of iron.

Front

What is the definition of a chemical formula?

Back

A representation of a substance using symbols for its constituent elements and numbers to indicate the ratio of atoms.

Front

What is the difference between an element and a compound?

Back

An element is a single type of atom, while a compound is made up of two or more different types of atoms chemically bonded together.

Front

Give an example of a physical change.

Back

Melting ice.

Front

What is the smallest unit of an element?

Back

An atom.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed.