Question

atoms, elements, compounds & mixtures
task: rewrite the sentences if you think they are wrong

1. all matter is made of tiny particles called elements
2. an element is a substance made of one atom
3. air, sea water and oxygen are mixtures
4. compounds are easily separated as their atoms are not chemically joined together

Explanation:

1. All matter is made of tiny particles called atoms, not elements. Elements are made of one - type of atom.
2. An element is a substance made of only one type of atom, not one atom.
3. Air and sea - water are mixtures, but oxygen is an element, not a mixture.
4. Compounds are not easily separated because their atoms are chemically joined together.

Answer:

1. All matter is made of tiny particles called atoms.
2. An element is a substance made of only one type of atom.
3. Air and sea - water are mixtures, oxygen is an element.
4. Compounds are not easily separated as their atoms are chemically joined together.