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Atoms, elements and compounds
Lower Sec Science · Secondary 1 · Medium · Atoms, elements and compounds
A student says that oxygen gas is made up of oxygen atoms only, so it must be an element. Using the idea of elements, compounds and mixtures, which statement correctly describes oxygen gas?
- It is an element because it contains only oxygen atoms.
- It is a compound because it contains oxygen molecules.
- It is a mixture because it contains many oxygen particles.
- It is a mixture because it can be separated by chemical means.
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