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Propriedades dos compostos orgânicos.pdf
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- 2. Temperatura de fusão eebulição
- 3. Solubilidade A maioria dos compostos orgânicosé apolar e se o solvente em questão for a água (polar): compostos orgânicos não se misturam com água. mesma polaridade semelhante dissolve semelhante.
- 4. Impurity An impurity isa substance, usually unwanted, which is present in another substance e.g. the blue element on this slide.
- 5. Medicines Medicines usually needto be pure substances and if an impurity is present, it could make it unsafe for the patient.
- 6. Mixtures A mixture istwo or more substances that are not chemically bonded together. These substances can be elements, compounds, or both.
- 7. Melting Point Pure substanceshave sharp melting points (e.g. 87 degrees C) whilst mixtures melt over a wider temperature range (e.g. 86- 89 degrees C).
- 8. Review Questions Explain whatan impurity is, in relation to a pure substance. How is the melting point different for a pure substance compared to a mixture? Define the term ‘pure’ in relation to a chemical.
- 9. Review Answers An impurityis usually a small quantity of something in an otherwise pure substance. Pure substances have sharp melting points whilst mixtures melt over a wider temperature range. A pure substance consists of only one type of element or only one type of compound.
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- 11. Resource Page Use theseelements in your presentation to keep it looking cohesive. Remember to delete this page before presenting!