December 8th Semester Exam Review 3rd Period

Front

What is Pangea?

Back

Pangea is a supercontinent that existed during the late Paleozoic and early Mesozoic eras, where all continents were joined together.

Front

What evidence supports the theory of continental drift?

Back

Fossils of the same species found on different continents, the same rock formations on different continents, and continents fitting together like puzzle pieces.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules of that substance are present.

Front

What are reactants in a chemical equation?

Back

Reactants are the starting substances in a chemical reaction, found on the left side of the equation.

Front

What are products in a chemical equation?

Back

Products are the substances formed as a result of a chemical reaction, found on the right side of the equation.

Front

What is a physical change?

Back

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

Front

What is the formula to calculate force?

Back

Force (F) is calculated using the formula F = mass (m) × acceleration (a).

Front

How much force is needed to accelerate a 5 kg marble at a rate of 5 m/s²?

Back

25 N (calculated using F = m × a, where m = 5 kg and a = 5 m/s²).

Front

What is the difference between a coefficient and a subscript in a chemical formula?

Back

A coefficient indicates the number of molecules, while a subscript indicates the number of atoms of an element in a molecule.

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.