Chemistry 9

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Chemistry 9 Lesson 53: Protein

Chemistry 9 Lesson 53: Protein 1. Theoretical Summary 1.1. Natural state 1.2. Composition and molecular structure a) Composition Mainly carbon, hydrogen, oxygen, nitrogen and a small amount of S, P, metals… b) Molecular structure Proteins are made up of amino acids, each amino acid molecule forming a “link” in the protein molecule. 1.3. Nature a) …

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Chemistry 9 Lesson 54: Polymers

Chemistry 9 Lesson 54: Polymers 1. Theoretical Summary 1.1. The concept of polymers Definition: Polymers are substances with very large molecular masses made up of many interconnected chains. Classify: Natural polymers: starch, cellulose, natural rubber … Synthetic polymers: polyethylene, polyvinylchloride, nylon silk.. 1.2. The structure and properties of polymers a) Structure Consists of many links …

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Chemistry 9 Lesson 55: Practice: Properties of glucose

Chemistry 9 Lesson 55: Practice: Properties of glucose 1. Theoretical Summary 1.1. Experiment purpose a. Knowledge Experimentally, verify and deepen knowledge of the chemical properties of glucose. b. Skill – Practice chemistry skills, solve practical chemistry exercises, experiment with small amounts of chemicals. – Practice observing, describing, explaining phenomena and writing chemical equations of experiments. …

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Chemistry 9 Lesson 56: Year-end review

Chemistry 9 Lesson 56: Year-end review Pass gases through Ca(OH) solution.2 residual: Which gas gives the precipitate CO .?2 HAVE2 + Ca(OH)2 excess → CaCO3 + FRIENDS2O Take the same volume of the remaining gases to react with the same volume of bromine solution of the same concentration: The gas that lightens the color of …

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Chemistry 9 Lesson 40: Petroleum and natural gas

Chemistry 9 Lesson 40: Petroleum and natural gas a. Physical properties Petroleum is a viscous, dark brown liquid, insoluble in water and lighter than water. b. Natural state and composition of petroleum Oil is in the ground, concentrated into oil fields. Oil fields have 3 layers: Gaseous layer: The main component of the gaseous layer …

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Chemistry 9 Lesson 41: Fuel

Chemistry 9 Lesson 41: Fuel 1. Theoretical Summary 1.1. What is fuel? Fuels are combustible substances that give off heat and light when burned. Note: Electricity is a form of energy that can emit light and heat but is not a fuel. 1.2. How are fuels classified? Based on the state, the fuel is divided …

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Chemistry 9 Lesson 37: Ethylene

Chemistry 9 Lesson 37: Ethylene 1. Theoretical Summary 1.1. Physical properties Ethylene is a gas, colorless, odorless, slightly soluble in water, lighter than air.(d = frac{{28}}{{29}})) 1.2. Molecular structure In an ethylene molecule, each carbon atom is bonded to two hydrogen atoms, the other two valencies bond two carbon atoms together. The structural formula of …

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Chemistry 9 Lesson 38: Acetylene

Chemistry 9 Lesson 38: Acetylene 1. Theoretical Summary 1.1. Physical properties Colorless, odorless gas, slightly soluble in water, lighter than air(d = frac{{26}}{{29}})) 1.2. Structural Formula – Structural formula of acetylene: H – C C – H – Short: ONLY ONLY – In the C . molecule2H2 has a triple bond (C ≡ C). There …

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Chemistry 9 Lesson 39: Benzene

Chemistry 9 Lesson 39: Benzene 1. Theoretical Summary 1.1. Physical properties – Liquid, colorless, insoluble in water, lighter than water, soluble in many substances such as cooking oil, rubber candles, iodine. – Benzene is toxic. 1.2. Molecular structure In the CTCT of benzene there are 3 double bonds and 3 alternating single bonds. a) Solid …

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