Chemistry Review

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Front

What is the atomic number?

Back

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

Front

How many electrons can fit in the first electron shell?

Back

The first electron shell can hold a maximum of 2 electrons.

Front

What is a physical property?

Back

A physical property is a characteristic of a substance that can be observed or measured without changing its chemical composition, such as melting point or boiling point.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is made up of two or more atoms bonded together.

Front

What is the freezing point of water?

Back

The freezing point of water is 0°C (32°F), where it changes from liquid to solid.

Front

What is a chemical property?

Back

A chemical property is a characteristic that can only be observed during a chemical reaction, such as reactivity with acids or bases.

Front

What is the significance of the periodic table?

Back

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