Elements and Compounds Flashcard

Front

What is a molecule?

Back

The simplest unit (particle) of a compound that can exist; formed when two or more atoms combine chemically.

Front

What is a compound?

Back

A pure substance made by chemically combining two or more elements; represented by a chemical formula.

Front

What do the chemical formulas CO and CO2 represent?

Back

They both represent one molecule.

Front

What is the chemical symbol found in aluminum hydroxide (AlOH3), potassium hydroxide (KOH), and sodium hydroxide (NaOH)?

Back

O (Oxygen) is the common chemical symbol in all three compounds.

Front

Is O2 a compound or a molecule?

Back

O2 is a molecule.

Front

Is CO2 a compound or a molecule?

Back

CO2 is a compound.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is made of two or more elements chemically combined.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule.

Front

What is the chemical formula for water?

Back

H2O, which indicates two hydrogen atoms and one oxygen atom.

Front

What is the significance of the chemical formula in a compound?

Back

It represents the types and numbers of atoms in the compound.