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Atoms, elements and compounds
Lower Sec Science · Secondary 1 · Hard · Atoms, elements and compounds
The diagram shows a mixture of oxygen and hydrogen molecules in a gas jar.
• Each oxygen molecule has 2 oxygen atoms.
• Each hydrogen molecule has 2 hydrogen atoms.
Which statement about elements and compounds is correct?
• Each oxygen molecule has 2 oxygen atoms.
• Each hydrogen molecule has 2 hydrogen atoms.
Which statement about elements and compounds is correct?
- Both oxygen and hydrogen are elements because each type of molecule contains only one kind of atom.
- Both oxygen and hydrogen are compounds because they contain more than one atom.
- Oxygen is a compound and hydrogen is an element.
- Oxygen is an element and hydrogen is a compound.
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