Chemistry Lecture 8

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Chemistry 8 Lesson 39: Exercise 6

Chemistry 8 Lesson 39: Exercise 6 1. Theoretical Summary 1.1. Experiment purpose – Practice experimental skills – Understand the chemical properties of water – Research the experiments, complete the test report 1.2. Experimental skills – Experiments are only allowed in the presence of teachers in the laboratory. – Read the instructions carefully and think before …

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Chemistry 8 Lesson 40: Solutions

Chemistry 8 Lesson 40: Solutions 1. Theoretical Summary 1.1. Solvent – Solvent – Solution a) Experiment 1: Dissolving sugar in water, we get a sugar water solution Comment: Sugar crystals dissolve in water to form a transparent solution that cannot be distinguished from sugar or water. Conclusion: + Solute: Sugar + Solvent: Water + Solution: …

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Chemistry 8 Lesson 41: Solubility of a substance in water

Chemistry 8 Lesson 41: Solubility of a substance in water 1. Theoretical Summary 1.1. Soluble and insoluble matter a) Test on the solubility of the substance – Experiment 1: Dissolve sand and salt in water Comment: Salt dissolves well in water, sand is insoluble in water. Conclusion: Some are soluble and some are insoluble in …

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Chemistry 8 Lesson 42: Solution concentration

Chemistry 8 Lesson 42: Solution concentration 1. Theoretical Summary 1.1. Percentage concentration of the solution a) Definition The percentage concentration (C%) of a solution tells us the number of grams of solute present in 100 grams of solution. The formula for calculating the percentage concentration of a solution: (C% = frac{{{m_{ct}}}}{{{m_{dd}}}}.100%)​ C% is the percentage …

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Chemistry 8 Lesson 43: Prepare solutions

Chemistry 8 Lesson 43: Prepare solutions 1. Theoretical Summary 1.1. How to prepare a solution according to a given concentration First of all, what is the solute and solvent? There are 2 types of preparation: – Prepare the solution according to the concentration – Prepare solution according to molarity Exercise 1: From CuSO . salt4, …

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Chemistry 8 Lesson 16: Chemical Equations

Chemistry 8 Lesson 16: Chemical Equations 1. Summary of theory 1.1. Make a chemical equation a. Chemical equation The word equation for the reaction: Hydrogen + Oxygen → Water Reaction diagram: H2 + O2 → FRIENDS2O – In figure 1: If according to the reaction diagram H2 + O2 → FRIENDS2O then + Left side: …

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Chemistry 8 Lesson 15: Law of conservation of mass

Chemistry 8 Lesson 15: Law of conservation of mass 1. Summary of theory 1.1. Experiment a. How to proceed? Step 1: Place 2 beakers containing dd BaCl2 and Na2SO4 onto 1 weighing plate Step 2: Place the weights on the other weighing pan. Step 3: Pour the cup containing dd BaCl2 into a cup containing …

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Chemistry 8 Lesson 14: Exercise 3

Chemistry 8 Lesson 14: Exercise 3 1. Summary of theory 1.1. Experiment purpose – Perform dissolution and heating of potassium permanganate (potassium permanganate) – Perform the reaction with calcium hydroxide (clear lime water). – Practice skills in using tools and chemicals to successfully and safely conduct experiments 1.2. Some safety rules in the laboratory – …

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Chemistry 8 Lesson 13: Chemical Reactions

Chemistry 8 Lesson 13: Chemical Reactions 1. Summary of theory 1.1. Define Chemical reaction is the process of changing from one substance to another. The initial substance that is changed in a reaction is called the reactant or the reactant. New substances formed in a reaction are called products. Letter Equation: Name of reactants → …

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Chemistry 8 Lesson 17: Exercise 3

Chemistry 8 Lesson 17: Exercise 3 1. Summary of theory 1.1. Chemical Phenomena A chemical change is a change in which one substance produces another substance. – Chemical reaction is the process of changing from one substance to another. The initial substance that is changed in a reaction is called the reactant or the reactant. …

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