Physical Science Final Exam

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

Front

What does the atomic mass of an element represent?

Back

The atomic mass of an element represents the average mass of an atom of that element, measured in atomic mass units (amu).

Front

What type of reaction is represented by the equation 4Si + S8 → 2Si2S4?

Back

This is a synthesis reaction, where two or more reactants combine to form a single product.

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change because it results in the formation of new substances (ash, smoke, gases) and involves a chemical reaction.

Front

What is the chemical symbol for Gold?

Back

The chemical symbol for Gold is Au.

Front

What are transition metals?

Back

Transition metals are elements found in groups 3-12 of the periodic table, characterized by their ability to form variable oxidation states and colored compounds.

Front

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

Back

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

Front

What is the atomic number of an element?

Back

The atomic number of an element is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a decomposition reaction?

Back

A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products.

Front

What is the significance of the chemical equation H2 + O2 → H2O?

Back

This equation represents the reaction between hydrogen and oxygen to form water, illustrating the conservation of mass as the number of atoms of each element is the same on both sides.