Chemistry -- 8th Grade Science Review

Front

Is the following equation balanced? 4 FeS + 7 O₂ → 2 Fe₂O₄ + 4 SO₂

Back

No

Front

What is the term for the number 8 in the following chemical formula 2C₈H₁₈?

Back

Subscript

Front

Which of the following is true about an element and a compound? An element cannot be broken down into simpler substances, but a compound can.

Back

True

Front

Which of the following best describes a physical change? Bubbles form in boiling water.

Back

True

Front

What part of the atom is responsible for all chemical reactions?

Back

Valence electron

Front

What is a chemical reaction?

Back

A process that involves the rearrangement of the molecular or ionic structure of a substance.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is a reactant?

Back

A substance that takes part in and undergoes change during a reaction.

Front

What is a product in a chemical reaction?

Back

A substance that is formed as a result of a chemical reaction.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down, while a compound is made of two or more elements chemically bonded together.