Front

What is 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 compound?

Back

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

Front

How many elements are in the compound Na2CO3?

Back

There are 3 elements: Sodium (Na), Carbon (C), and Oxygen (O).

Front

Which of the following is an example of an element: H2O, HCl, NaCl, Au, CaCO3?

Back

Au (Gold) is an example of an element.

Front

True or False: A compound consists of two or more elements bound together.

Back

True.

Front

What distinguishes compounds from elements?

Back

Compounds are combinations of two or more different elements, while elements consist of only one type of atom.

Front

What is the chemical formula for water?

Back

H2O.

Front

What is the chemical formula for table salt?

Back

NaCl.

Front

What is the chemical formula for carbon dioxide?

Back

CO2.

Front

What is the difference between a molecule and a compound?

Back

A molecule is formed when two or more atoms bond together, which can be the same or different elements. A compound specifically refers to a molecule made of different elements.