Chemistry Review

Front

What is an element?

Back

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

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. An example is ammonia (NH3).

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Each substance retains its own properties.

Front

What is a solution?

Back

A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). An example is saltwater.

Front

What happens to matter during a physical change?

Back

Matter is conserved during a physical change; it changes form but the total amount of matter remains the same.

Front

Where are the most reactive metals located on the periodic table?

Back

The most reactive metals are located in the column at the far left side of the periodic table, known as the alkali metals.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

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; it is conserved.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of elements organized by increasing atomic number, showing periodic trends in properties.

Front

What is an atom?

Back

An atom is the smallest unit of an element that retains the properties of that element, consisting of protons, neutrons, and electrons.