Chemical equations, also known as chemical reaction equations, are formulas that represent chemical reactions with chemical formulas. Chemical equations reflect objective facts. Chemical formulas (organic compounds in organic chemistry generally use a simple structural formula) to express the chemical reaction of substances are called chemical equations. [1]
To write the chemical formula of a substance correctly, one is to be proficient in memorizing element symbols. The other is to be proficient in remembering the valences of common elements and atomic groups when writing the chemical formula of a compound. The principle of zero, the fourth is to master the general method of writing chemical formulas. All in all, this is the essence of writing chemical formulas. [3]
Chemical equation
Basic reaction type
Reaction phenomenon
use
chemical reaction
Hydrogen burns in chlorine, emits a pale flame, generates a lot of heat, and generates a white mist
Synthesis of hydrogen chloride to prepare hydrochloric acid.
chemical reaction
With white smoke
chemical reaction
With white smoke
chemical reaction
There is a yellow flame that emits a lot of heat and produces white smoke.
chemical reaction
Burns violently, producing tan smoke.
chemical reaction
Burns violently, producing tan smoke.
chemical reaction
Violent burning, producing brownish yellow smoke.
chemical reaction
chemical reaction
chemical reaction
Displacement reaction
At first, a milky white precipitate was formed, and then the precipitate became pale yellow.
Redox reactions
The gas in the test tube faded, and a pungent odor gas escaped from the test tube mouth
Displacement reaction
chemical reaction
Iron burns violently in pure oxygen, and Mars radiates, giving off a lot of heat, forming a black solid.
chemical reaction
Potassium burns in pure oxygen with a light purple flame, which produces a yellow solid.
preparation
Master the writing of chemical equations
Write the reactants on the left, generate on the right, and balance the chemical formula and coefficient, with an equal sign in the middle. The conditions should be clearly stated, and precipitation gas is generated.
Categorical memory
According to the knowledge series or reaction type or material type memory, scattered knowledge can be summarized into a knowledge network with a regular and focus on key substances through induction.
Contact experimental phenomenon memory
Chemical equations are boring and difficult to remember. How to make the learning of chemical terms colorful and interesting can be linked to the memory of experimental phenomena. Such as sulfur burning in oxygen, memory associations: burning sulfur into oxygen, combustion becomes prosperous, flame blue-violet, beautiful and beautiful, generating gas, it can be really "". Phosphorus burns in oxygen, memory association: red phosphorus burns, it can be really lively, the smoke billows, and it looks like a "bulb".
