JAMB Exam > JAMB Videos > Chemistry for JAMB > Pure and Impure Substances - 1
Pure and Impure Substances - 1 Video Lecture | Chemistry for JAMB
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FAQs on Pure and Impure Substances - 1 Video Lecture - Chemistry for JAMB
| 1. What is the difference between a pure substance and an impure substance? |  |
Ans. A pure substance is a material made up of only one type of particle, while an impure substance is a material made up of more than one type of particle. Pure substances have a fixed composition and distinct physical and chemical properties, whereas impure substances have varying compositions and may exhibit different properties depending on the proportions of the different particles present.
| 2. How can we determine if a substance is pure or impure? | |
Ans. One way to determine if a substance is pure or impure is through laboratory tests. For example, measuring the boiling point or melting point of a substance can help determine its purity. If the substance has a sharp and consistent boiling or melting point, it is likely pure. However, if the substance shows a range of temperatures or a gradual change in state, it is likely impure.
| 3. What are some examples of pure substances? | |
Ans. Examples of pure substances include elements such as gold, oxygen, and carbon, as well as compounds like water (H2O) and table salt (NaCl). These substances have a uniform composition and cannot be separated into simpler substances by physical means.
| 4. How can impurities affect the properties of a substance? | |
Ans. Impurities can have various effects on the properties of a substance. They can alter the melting and boiling points, density, conductivity, and even the appearance or color of the substance. Impurities can also affect the reactivity and chemical behavior of a substance, leading to different reactions or outcomes compared to a pure substance.
| 5. What are the common methods of purifying impure substances? | |
Ans. There are several methods for purifying impure substances, depending on the nature of the impurities and the substance itself. Some common methods include filtration, distillation, crystallization, chromatography, and electrolysis. These techniques aim to separate the impurities from the substance, either by physical or chemical means, resulting in a purer form of the substance.
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Dec 25, 2024 Last updated |
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