Elements and Compounds

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include gold, oxygen, and hydrogen.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together. Examples include water (H2O) and carbon dioxide (CO2).

Front

Which of the following is an example of an element: Gold, Water, or Air?

Back

Gold is an example of an element.

Front

Which of the following is NOT an example of an element: Helium gas, Hydrogen, Ice, or Iron?

Back

Ice is NOT an example of an element; it is a compound made of water.

Front

What organizes all the elements and shows their symbols and atomic weights?

Back

The Periodic Table of the Elements organizes all the elements and shows their symbols and atomic weights.

Front

How many elements are in H2O?

Back

There are 2 different elements in H2O: Hydrogen and Oxygen.

Front

What is the symbol for Gold?

Back

The symbol for Gold is Au.

Front

What is the symbol for Oxygen?

Back

The symbol for Oxygen is O.

Front

What is the difference between an element and a compound?

Back

An element is a single type of atom, while a compound consists of two or more different types of atoms bonded together.

Front

Can elements exist in different forms?

Back

Yes, elements can exist in different forms called allotropes, such as carbon which can be found as diamond or graphite.