Grade 9 Chemistry

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 bromine solution is C .2H4 OLD2H4 + Br2 … [Read more...] about Chemistry 9 Lesson 56: Year-end review

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, … [Read more...] about Chemistry 9 Lesson 55: Practice: Properties of glucose

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 … [Read more...] about Chemistry 9 Lesson 54: Polymers

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. … [Read more...] about Chemistry 9 Lesson 53: Protein

Chemistry 9 Lesson 52: Starch and cellulose 1. Theoretical Summary 1.1. Natural state and physical properties - Starch: There are many seeds, tubers and fruits of food crops such as corn, potatoes, cassava, rice, ... Solid, white color, soluble only in hot water to form starch solution. - Cellulose: There are many in vegetables, stems, … [Read more...] about Chemistry 9 Lesson 52: Starch and cellulose

Chemistry 9 Lesson 51: Sucrose 1. Theoretical Summary Molecular Formula: CtwelfthH22O11 Atomic mass: 342 g/mol 1.1. Natural state 1.2. Physical properties It is a crystalline substance, colorless, sweet taste, soluble in water, especially in hot water 1.3. Chemical properties Sucrose itself does not have a mirror reaction, but because of the hydrolysis … [Read more...] about Chemistry 9 Lesson 51: Sucrose

Chemistry 9 Lesson 50: Glucose 1. Theoretical Summary Molecular Formula: C6HtwelfthO6 Molecular Mass: 180 g/mol 1.1. Natural state 1.2. Physical properties Glucose is a crystalline substance, colorless, sweet taste, easily soluble in water. 1.3. Chemical properties a) Glucose oxidation reaction ⇒ The application of this reaction is for … [Read more...] about Chemistry 9 Lesson 50: Glucose

Chemistry 9 Lesson 49: Practice: Properties of alcohols and acids 1. Theoretical Summary 1.1. Experiment purpose a. Knowledge Experimentally, verify and deepen knowledge of the chemical properties of ethyl alcohol and acetic acid. b. Skill - Practice chemistry skills, solve practical chemistry exercises, experiment with small amounts of … [Read more...] about Chemistry 9 Lesson 49: Practice: Properties of alcohols and acids

Chemistry 9 Lesson 48: Practice Ethyl alcohol, acetic acid and fats 1. Theoretical Summary a. Ethyl alcohol: - Structural formula: ON3- ONLY2-OH - Physical properties: It is a colorless, liquid that boils at 78.30, lighter than water Infinitely soluble in water, soluble in many substances such as iodine, benzene, etc. - Chemical … [Read more...] about Chemistry 9 Lesson 48: Practice Ethyl alcohol, acetic acid and fats

Chemistry 9 Lesson 47: Fat 1. Theoretical Summary 1.1. Where is fat? Fat is the main component of fats, oils, etc. found in the body of animals and plants. 1.2. Physical properties of fats Fats are lighter than water, insoluble in water, soluble in benzene, gasoline, kerosene, etc. a) Water b) Benzene 1.3. Composition and structure of … [Read more...] about Chemistry 9 Lesson 47: Fat