Semester 1 Final Exam

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into new substances (products) with different properties.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence includes the production of gas, color change, temperature change, or the formation of a precipitate.

Front

What is an element?

Back

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

Front

What does CaCO₃ represent?

Back

It represents a chemical formula for calcium carbonate.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of two or more substances that retain their individual properties, while a compound is a substance formed when two or more elements chemically bond.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it remains constant.

Front

What is a reactant?

Back

A substance that undergoes change during a chemical reaction.

Front

What is a product?

Back

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

Front

What is a subscript in a chemical formula?

Back

A number written below and to the right of a chemical symbol indicating the number of atoms of that element in a molecule.