In this module, you will learn:

  • what is a compound?
  • examples of compounds

Resources to help you:

  • Textbook: page 61 and 62
  • Notebook: page 28 and 29

Watch the video

Learn how elements and compounds are different

Source: https://www.youtube.com/watch?v=bJvZOlTWzVo

You can change the speed to 0.75x to make it easier to listen.

Table salt is made from a compound called sodium chloride

Credit: @orcearo via Twenty20

Compounds

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A compound is a substance that is made of two or more elements chemically combined.


Compounds do not have the same properties as the elements they are made of.

Compounds:

different from their elements

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Table salt, or sodium chloride is a compound. It is made of two different elements, sodium and chlorine.

Salt is safe for us to eat, and we use it to season our food.

Let's look at the elements that make up the salt that we eat.

Sodium

Credit: @Dnn87 via Wikipedia CC BY SA 3.0

Sodium is a metal and is very reactive. It can explode if it comes in contact with water.

Source: https://www.youtube.com/watch?v=5UsRiPOFLjk

Chlorine

Credit: @W. Oelen via Wikimedia CC BY SA 3.0

Chlorine is a gas that is greenish yellow in colour. It is a toxic gas and can cause death.

Other examples

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Below are some examples of common compounds and their elements:


carbon dioxide is a compound made from the elements carbon and oxygen


water is a compound made from the elements hydrogen and oxygen


sugar is a compound made from the elements carbon, hydrogen and oxygen

Water is made of elements of hydrogen and oxygen

Credit:@Wandeaw via Twenty20

Ready for the next module?

In the next module, we will look at mixtures.

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