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Question
Classify the following as elements, compounds, or mixtures in Table 8.3: Carbon dioxide, sand, seawater, magnesium oxide, muddy water, aluminium, gold, oxygen, rust, iron sulfide, glucose, air, water, fruit juice, nitrogen, sodium chloride, sulfur, hydrogen, baking soda. Identify pure substances amongst these and list them below.
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Answer
Sorted into elements, compounds, and mixtures below.
Explanation
| Elements | Compounds | Mixtures |
|---|---|---|
| Aluminium, gold, oxygen, nitrogen, sulfur, hydrogen | Carbon dioxide, magnesium oxide, rust, iron sulfide, glucose, water, sodium chloride, baking soda | Sand, seawater, muddy water, air, fruit juice |
- Pure substances = all elements + all compounds.
- So: aluminium, gold, oxygen, nitrogen, sulfur, hydrogen,
- carbon dioxide, magnesium oxide, rust, iron sulfide,
- glucose, water, sodium chloride, baking soda.
Mixtures are sand, seawater, muddy water, air, and fruit juice; everything else is a pure substance.
← Back to concept: 8.1.2 Types of mixtures
