“Learning from a teacher is not as good as learning from friends,” but sometimes “learning from a teacher” is still the most effective path, especially when learning specialized knowledge like chemistry. Have you heard of “Teacher Quang” – a “legendary” name in Vietnamese chemistry education? He is famous for his unique and easy-to-understand teaching methods, helping students “memorize lessons” as easily as “eating a meal.” So, how can you distinguish between the types of chemical substances Teacher Quang taught? Let’s explore this secret in the article below!
Classifying Chemical Substances According to Teacher Quang
1. Classification Based on Physical Properties
Teacher Quang often divides chemical substances into two main groups based on physical properties:
- Solids: Substances with a definite shape and volume. For example: salt, sugar, limestone.
- Liquids: Substances with a definite volume but no definite shape. For example: water, alcohol, cooking oil.
- Gases: Substances with no definite shape and volume. For example: oxygen gas, nitrogen gas, carbon dioxide gas.
2. Classification Based on Chemical Properties
According to Teacher Quang, the chemical properties of a substance are expressed through its ability to participate in chemical reactions. He divides chemical substances into the following main groups:
- Acids: Substances that taste sour and turn litmus paper red. For example: hydrochloric acid (HCl), sulfuric acid (H2SO4), nitric acid (HNO3).
- Bases: Substances that taste bitter and turn litmus paper blue. For example: sodium hydroxide (NaOH), potassium hydroxide (KOH), calcium hydroxide (Ca(OH)2).
- Salts: Products formed from the reaction between acids and bases. For example: sodium chloride (NaCl), potassium nitrate (KNO3), calcium sulfate (CaSO4).
- Oxides: Compounds of oxygen with another element. For example: sodium oxide (Na2O), calcium oxide (CaO), iron oxide (Fe2O3).
How to Distinguish Between Types of Chemical Substances?
Teacher Quang often uses simple experimental methods to help students distinguish between types of chemical substances:
- Using litmus paper: Litmus paper is a color indicator that can change color when in contact with acids, bases, or salts.
- Using phenolphthalein solution: Phenolphthalein solution is colorless in an acidic environment but turns pink in a basic environment.
- Using silver salt solution: Silver salt solution can react with halide ions (Cl-, Br-, I-) to form white, pale yellow, or dark yellow precipitates.
The Secret of “Learning from Friends is Better Than Learning from a Teacher”
To effectively distinguish between types of chemical substances, you can learn from the experiences of friends who have studied chemistry with Teacher Quang. Discuss with them about distinguishing methods, tips for memorizing chemical formulas, or important highlights in Teacher Quang’s lectures. In addition, you can join forums and online study groups to share knowledge and solve difficult questions together.
Conclusion
Understanding how to distinguish between types of chemical substances is an important step in learning chemistry. Remember the basic knowledge, combine it with practice and exchange with friends to improve your skills. You can also visit the website “HỌC LÀM” to learn more about articles on education, how to get rich, make money, and career orientation. Leave a comment below if you have any questions about how to distinguish between types of chemical substances or other issues related to chemistry. Wish you effective study and achieve good results!