Semester One Review

Front

What is an atom?

Back

The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What is a molecule?

Back

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

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means, represented by a symbol on the periodic table.

Front

What is a compound?

Back

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

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What does H₂ represent?

Back

A molecule of hydrogen gas, consisting of two hydrogen atoms.

Front

How many elements are in Na₂CO₃?

Back

Three elements: Sodium (Na), Carbon (C), and Oxygen (O).

Front

What is the chemical symbol for Krypton?

Back

Kr, it is a noble gas and an element.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded.

Front

What is the periodic table?

Back

A tabular arrangement of chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties.