is an example of an extensive property? a. mass b. density c. color d. boiling point ______ 4. Which of these is an example of an element? a. sugar b. soil c. water d. oxygen ______ 5. Which of these is an example of a heterogeneous mixture? a. salt b. nitrogen c. mud d. air ______ 6. Which process is a chemical change? a. heating to boiling b. dissolving in alcohol c. burning in air d. slicing into two pieces ______ 7. At sea level‚ water boils at 100°C. This is an example
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Introduction Weight determination represents one of the most accurate and precise form of measurement carried out in lab analysis. Thus‚ gravimetric analysis provides a great assay of a variety of analytes. Mixtures of compounds in difference phases provide us with one of the simplest methods of separation and mass explorations. Separating a solid mass from a liquid involves the commonplace technique of filtration. Accordingly‚ the conversion of an analyte dissolved
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| |Formal Report 1 | | | |Experiment Number 3 | | | |Chem201L | | Determination of
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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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other substances c. Mixture: a substance consisting of two or more substance mixed together d. Solution: A homogeneous mixture of two or more substances e. Emulsion: a colloid in which both phases are liquids f. Suspension: a mixture in which fine particles are suspended in a fluid where they are supported g. Colloidal dispersion: a colloid that has continuous liquid phase in which a solid is suspended in a liquid. 5. How do you classify the four mixtures used: a. Salts and
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honey production. OR (a) Identify soluble and solvent in the following solutions: [3] (i) Aerated drinks (ii) Tincture of iodine (iii) Lemon water (b) State the principle of each if the following methods of separation of mixtures. [2] (i) Centrifugation method (ii) Separation using separating funnel. 24. (a) Differentiate between Mass and Weight [Four points]. [2] (b) Show that weight of an object on moon is equal to of the weight if the object on the earth. Given
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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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Separation of a Mixture of Solids PURPOSE: The purpose of this lab is to familiarize ourselves with the techniques associated with separating a mixture of different solids. We will learn how the unique properties of substances can aid in this process and help us distinguish each pure substance from one another. DATA OBSERVATIONS CALCULATIONS CONCLUSION/DISCUSSION QUESTIONS A. How did your proposed Procedures or flow charts at the beginning of this experiment compare to the actual Procedures
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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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1. It is estimated that uranium is relatively common in the earth’s crust‚ occurring in amounts of 4 g/metric ton. A metric ton is 1000 kg. At this concentration‚ what mass of uranium is present in 1.0 mg of the earth’s crust? a) 4 nanograms b) 4 micrograms c) 4 milligrams d) 4 × 10–5 g e) 4 centigrams Ans: a) 4 nanograms Page: 1.3‚6 2. In 1928‚ 1.0 g of a new element was isolated from 660 kg of the ore molybdenite
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