------------------------------------------------- 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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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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specific melting point‚ within one or two degrees Celsius. This is in opposition to a mixed‚ or contaminated substance‚ which will have a broad melting range. Therefore‚ when we mix our unknown with samples of phenacetin and acetanilide‚ whichever mixture has a more accurate melting point will tell us what our unknown is. It is also important to make sure that the resulting melting points are close to what the proven melting points of the substances are. Reaction Name of substance structure
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Efficacy of used plastics candles in making polishing agents La Salette of San Mateo San mateo‚ Isabela (name) Abstract Most of us spend about 90%of our time indoors‚ so minimizing the use of harmful chemicals in our homes‚ offices and schools is important to keep the air we breathe healthy and constructed surfaces we live on free of irritants and toxins. Besides being expensive‚ store-brought cleaners contain a number of chemicals. These chemicals can be hazardous to our health
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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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Nuts and Bolts Purpose: The purpose of the lab is to correctly describe and distinguish samples and models of elements‚ compounds‚ and mixtures. The lab asks you to examine conceptual models of matter in which atoms of one element are represented by nuts while atoms of another element are represented by bolts. After examining each model‚ complete the following tasks: a. sketch a representative molecular picture of the model; b. describe the composition of the model in words (does
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