Honors Chemistry 1st Semester Final

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. Examples include changes in state (like melting or freezing), shape (like crumpling paper), or size.

Front

Which of the following is NOT an example of a physical change?

Back

Sour milk is NOT an example of a physical change; it is a chemical change due to the process of fermentation.

Front

What is the formula for density?

Back

Density = mass / volume.

Front

How do you calculate density?

Back

To calculate density, divide the mass of an object by its volume.

Front

What are the three subatomic particles of an atom?

Back

The three subatomic particles are protons (positive charge), neutrons (no charge), and electrons (negative charge).

Front

Where are protons located in an atom?

Back

Protons are located in the nucleus of an atom.

Front

What is the charge of an electron?

Back

Electrons have a negative charge.

Front

In which region of the periodic table are the most reactive elements found?

Back

The most reactive elements are found in Group 1 (the alkali metals) of the periodic table.

Front

What is the significance of the period number in the periodic table?

Back

The period number indicates the highest energy level of electrons in the elements of that row.

Front

What is the atomic number of an element?

Back

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