Chemistry Notes 1 and 2

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, often accompanied by energy changes, color changes, or gas production.

Front

What are subatomic particles?

Back

Subatomic particles are the smaller particles that make up an atom, including protons (positive charge), neutrons (no charge), and electrons (negative charge).

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.

Front

What is the atomic mass of an atom?

Back

The atomic mass is the total number of protons and neutrons in an atom's nucleus, usually expressed in atomic mass units (amu).

Front

What does the periodic table represent?

Back

The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What are periods on the periodic table?

Back

Periods are horizontal rows in the periodic table that indicate the number of electron shells in the elements.

Front

What are groups or families on the periodic table?

Back

Groups or families are vertical columns in the periodic table that contain elements with similar chemical properties.

Front

What is the significance of the atomic theory?

Back

The atomic theory explains the nature of matter, stating that all matter is composed of atoms, which are indivisible and can combine in various ways.

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 an example of a chemical change?

Back

An example of a chemical change is the rusting of iron, where iron reacts with oxygen to form iron oxide.