Purpose: a) Determine the melting points of two organic compounds known to have the same melting range when pure. b) Determine the mixture melting point of a mixture of the two pure compounds. c) Identify an unknown organic compound by determining its melting point and mixture melting point. Procedure and Observations: Using the procedure outlined in Appendix A of the Lab Manual‚ approximately equal samples of p-Nitrophenol and acetanilide‚ which are known to have the same melting range
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------------------------------------------------- Mixture From Wikipedia‚ the free encyclopedia For other uses‚ see Mix (disambiguation). | This article needs additional citations for verification. Please help improve this article byadding citations to reliable sources. Unsourced material may be challenged and removed.(December 2012) | In chemistry‚ a mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination
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Mix a little of A and B together in a test tube. Describe what you see. • 2. Mix a little of C and D together in a test tube. Describe what you see. • 3. Add a little water to the mixture of C and D. What happens? • 4. Add a little water to the mixture of A and B. What happens? • 5. Add a little heptane to the two mixtures. What happens? Results: Nr. 1 Observations The substances do not mix but separate neatly with one on top (A) and one on the bottom (B). A meniscus that is concave up forms between
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matter Pure substance Element Compound Mixture Homogenous Heterogeneous colloid Suspension True solution MATTER Everything in the Universe is made up of MATTER PURE SUBSTANCE The substance which contains same kind of Atom or Molecule i] element A pure substance which contain same kind of Atom ii] compound A pure substance which contain same kind of Atom or Molecule but made up of different Atoms through a Chemical bound Mixture Mixture are constitutor by more than one kind of pure
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Substance- A material with a constant composition. Substance is the same no matter where it is found. All elements and all compounds are defined as substances. • Compounds- Substances that are made up of more than one type of atom. Compounds differ from mixtures in that they are chemically combined. Unlike elements‚ compounds can be decomposed or broken down by simple chemical reactions. • Phase- A phase is any region of a material that has its own set of properties. • Homogenous Materials- Any material
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have the same characteristic properties. Therefore‚ we can say that a mixture contains more than one substance. Fig. 2.1: Some consumable items Have you ever noticed the word ‘pure’ written on the packs of these consumables? For a common person pure means having no adulteration. But‚ for a scientist all these things are actually mixtures of different substances and hence not pure. For example‚ milk is actually a mixture of water‚ fat‚ proteins etc. When a scientist says that something is pure
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research students different methods of separating substances from one another. Materials that are not uniform in composition are set to be impure or heterogeneous and are called mixtures. The separation of the components of mixtures is based upon the fact that each component has different physical properties. The components of mixtures are always pure substances‚ either compounds or elements‚ and each pure substance possesses a unique set of properties. Every crystal of a pure substance
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experiment is to compare the gravimetric result of the original mixture and the separated substance. The other objective is to calculate each percent composition of the substance that was in the mixture. Introduction : Percent composition is about calculating the percentage of a specific substance in a mixture or compound. It is used mostly to calculate the percentage of an element in a compound using moles. To find percent composition in a mixture‚ the first thing need to be done is by using separation
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------------------------------------------------- CTET Chapter 2 MONDAY‚ JULY 16‚ 2012 Chapter 3 CBSE - Class 9 - CH2 - Is Matter Around Us Pure Q1: On the basis of composition‚ how matter is classified? Answer: * Pure Subtance * Mixture Q2(NCERT): What is meant by a pure substance? Answer: A sample of matter containing only one substance is called a pure substance. In other words all constituents of the substance are same in their chemical nature. Q3: What are the characteristics
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study of matter easier to understand‚ scientists have developed ways to classify matter. • The properties of materials can be used to classify them into general categories. – Ex: Pure substances‚ elements‚ compounds‚ mixtures‚ etc. • Materials are made of a pure substance or a mixture of substances. – Substance: A type of matter with a fixed composition. • A substance can either be an element or a compound. – Ex: Helium‚ Aluminum‚ Water‚ Salt‚ etc. • Elements are built from atoms. – Atom: The
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