【人教版】Junior High Chemistry Grade 9 Volume 2

📚 Content Summary

This course covers the core content of the second semester of Grade 9 Chemistry, including the properties and uses of metallic materials, the formation and properties of solutions, the chemical reactions of acids and bases, the application of salts and chemical fertilizers, and the close relationship between chemistry and daily life. The course emphasizes experimental inquiry and the connection between theory and practice.

Explore the mysteries of substances, appreciate the charm of chemistry, and build scientific literacy.

Author: Wang Jing, Zheng Changlong

Acknowledgments: Published by People's Education Press, compiled by the Chemistry Curriculum Textbook Research and Development Center of the Curriculum Textbook Research Institute.

🎯 Learning Objectives

1. Understand the physical properties of common metals, recognize the definition of alloys and their excellent properties (e.g., titanium alloys and shape memory alloys).
2. Master the patterns of reactions between metals and oxygen, acids, and certain salt solutions; be able to identify displacement reactions and apply the activity series of metals to solve problems.
3. Understand the principles of iron smelting (hematite, magnetite), investigate the conditions for iron corrosion, and establish awareness of conserving metal resources.
4. Master the concepts of solution, solute, and solvent; understand the transformation relationship between saturated and unsaturated solutions; memorize the definitions of solid and gas solubility.
5. Be proficient in interpreting solubility curves, obtain substance solubility at different temperatures from graphs, and explain factors affecting seawater salt extraction and gas dissolution.
6. Master calculations of solute mass fraction (including dilution and calculations combined with chemical equations), and independently complete the experiment of preparing a sodium chloride solution with a specific mass fraction.
7. Be able to use acid-base indicators (litmus, phenolphthalein) to test the acidity or basicity of a solution.
8. Master the main properties, uses, and safe operation procedures (e.g., diluting concentrated sulfuric acid) of hydrochloric acid, sulfuric acid, sodium hydroxide, and calcium hydroxide.
9. Understand the essence of neutralization reactions (H^+ combining with OH^- to form water) and their applications in production and daily life.
10. Be able to identify common salts in daily life, accurately describe their common names, and master the main uses of sodium chloride, sodium carbonate, sodium bicarbonate, and calcium carbonate.

🔹 Lesson 1: Unit 8: Metals and Metallic Materials

Overview: This unit comprehensively introduces knowledge related to metals and metallic materials. The content covers everything from the physical properties of metals and the characteristics of alloys to the chemical properties of metals (e.g., reactions with oxygen, acids, and salt solutions), and delves into the application of the activity series of metals. Additionally, this unit covers the development, utilization, and conservation of metal resources.

Learning Outcomes:

• Understand the physical properties of common metals, recognize the definition of alloys and their excellent properties (e.g., titanium alloys and shape memory alloys).
• Master the patterns of reactions between metals and oxygen, acids, and certain salt solutions; be able to identify displacement reactions and apply the activity series of metals to solve problems.
• Understand the principles of iron smelting (hematite, magnetite), investigate the conditions for iron corrosion, and establish awareness of conserving metal resources.

🔹 Lesson 2: Unit 9: Formation and Concentration of Solutions

Overview: This unit covers core concepts about solutions in middle school chemistry, from macroscopic phenomena of formation to microscopic molecular diffusion, and further to quantitative solubility and solute mass fraction calculations. Students will learn how to distinguish between saturated and unsaturated solutions, interpret solubility curves, and master the practical skill of accurately preparing a solution with a specific mass fraction in the laboratory.

Learning Outcomes:

• Understanding and Memorization: Master the concepts of solution, solute, and solvent; understand the transformation relationship between saturated and unsaturated solutions; memorize the definitions of solid and gas solubility.
• Analysis and Application: Be proficient in interpreting solubility curves, obtain substance solubility at different temperatures from graphs, and explain factors affecting seawater salt extraction and gas dissolution.
• Calculations and Experiments: Master calculations of solute mass fraction (including dilution and calculations combined with chemical equations), and independently complete the experiment of preparing a sodium chloride solution with a specific mass fraction.

🔹 Lesson 3: Unit 10: Common Acids and Bases

Overview: This unit focuses on the physical properties, chemical properties, and practical uses of common acids and bases. By studying acid-base indicators, neutralization reactions, and the expression of solution acidity/basicity (pH), students will build a chemical thinking pattern linking macroscopic phenomena to microscopic essence and master the experimental skills for safely handling corrosive substances.

Learning Outcomes:

• Be able to use acid-base indicators (litmus, phenolphthalein) to test the acidity or basicity of a solution.
• Master the main properties, uses, and safe operation procedures (e.g., diluting concentrated sulfuric acid) of hydrochloric acid, sulfuric acid, sodium hydroxide, and calcium hydroxide.
• Understand the essence of neutralization reactions (H^+ combining with OH^- to form water) and their applications in production and daily life.

🔹 Lesson 4: Unit 11: Salts and Chemical Fertilizers

Overview: This unit focuses on common salts in daily life and their important uses in daily life and industrial production. By exploring double displacement reactions between acids, bases, and salts and the conditions for their occurrence, the inherent laws of chemical reactions are revealed. At the same time, the course extends to the field of agriculture, elaborating in detail on the functions and identification of chemical fertilizers.

Learning Outcomes:

• Be able to identify common salts in daily life, accurately describe their common names, and master the main uses of sodium chloride, sodium carbonate, sodium bicarbonate, and calcium carbonate.
• Understand the concept of double displacement reactions and be able to determine whether a reaction occurs based on the presence of precipitate, gas, or water in the products.
• Master the effects of nitrogen, phosphorus, and potassium fertilizers on plant growth, and be able to conduct simple identification based on appearance, solubility, and chemical reactions.

🔹 Lesson 5: Unit 12: Chemistry and Life

Overview: This unit focuses on the close relationship between chemical substances and human health and social development. The content covers the functions and sources of the six essential nutrients required for life activities, as well as the properties, applications, and environmental impacts of organic synthetic materials. Through learning, students will establish awareness of a balanced diet for health and evaluate the pros and cons of synthetic materials in modern life from a chemical perspective.

Learning Outcomes:

• Identify and Understand Nutrients: Be able to list important nutrients for humans and explain the significance of proteins, carbohydrates, fats, and vitamins for life activities.
• Classification of Organic Compounds: Be able to distinguish between inorganic and organic substances, and understand the difference between small organic molecules and organic polymers.
• Master the Properties of Synthetic Materials: Identify plastics, synthetic fibers, and synthetic rubber; distinguish between thermoplastics and thermosetting plastics through experimental phenomena; understand composite materials.