1. Describe the differences between elements, compounds and mixtures.

A substance made up of only one type of atom is called an element.

A substance made of two or more different types of atoms is called a compound.

A mixture contains two or more elements or compounds that are not chemically bonded together.

  1. Demonstrate understanding of the concepts of element, compound and mixture.

Hydrogen, Oxygen, Calcium, Aluminium, Iron are all elements since they only contain their respective atoms.

Water (H2O) is a compound since it contains atoms of both hydrogen and oxygen.

When sand and iron powder is mixed, it is called a mixture since there is no chemical reaction between the both; the elements or compounds in a mixture still have their characteristic properties- there is no change.

 

Notes submitted by Lintha

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