Chemistry -- 8th Grade Science Review

Front

How many atoms of Aluminum are in 2Al₂(CO₃)₃?

Back

4

Front

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

Back

Valence electron

Front

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

Back

No

Front

When stomach acid helps to break down food into smaller particles, this is an example of what kind of change?

Back

Chemical change

Front

Which of the following is not true when referring to the Law of Conservation of Mass? The coefficients in the reactants must be the same as the coefficients in the products.

Back

The coefficients in the reactants must be the same as the coefficients in the products.

Front

What is the definition of an atom?

Back

The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.

Front

What is the Law of Conservation of Mass?

Back

Mass is neither created nor destroyed in a chemical reaction; the mass of the reactants equals the mass of the products.

Front

What are valence electrons?

Back

Electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

What is a chemical equation?

Back

A symbolic representation of a chemical reaction, showing the reactants and products.