Distinguish elements, compounds and mixtures
The idea
An element contains one type of atom, even when its atoms occur in molecules.
Step by step
- An element contains one type of atom, even when its atoms occur in molecules.
- A compound contains different elements chemically bonded in a fixed composition.
- A mixture contains more than one substance physically combined.
Example
A pure sample contains only helium atoms. Which category fits?
Answer
an element
Helium contains only one atomic element.
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Draw particle models for oxygen gas, water and saltwater. Explain why a molecule need not be a compound.
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