There are two kinds of reactions between charcoal and copper oxide, depending on the ratio of charcoal to copper oxide: C+CuO = = Cu+Co ↑ (charcoal excess) c+2cuo = = CO2 ↑+2cu (charcoal deficiency). Please note that the upward arrow indicates the gas product.
Chemical equation:
Chemical Equation (chemical equation), also known as chemical reaction equation, is a chemical formula representing the chemical reaction of substances (in organic chemistry, the structure of organic matter is generally simplified).
Chemical equations not only represent reactants, products and reaction conditions. At the same time, stoichiometry represents the quantitative relationship between reactants and products, and the mass relationship between substances, that is, the mass ratio between substances, can also be expressed by relative molecular mass or relative atomic mass. For gaseous reactants and products, the volume ratio can also be obtained directly from stoichiometry.
First, the arrow and the equal sign
In professional literature, both inorganic and organic reaction equations use the arrow "→" to connect reactants and products. Arrows are also used in foreign chemistry textbooks, Shanghai middle school chemistry curriculum reform textbooks (Shanghai Science and Technology Publishing House, edited by Yao Zipeng, July 2006), 20 1 1-20 12 Jiangsu Education Edition chemistry books, Shanghai college entrance examination chemistry papers and comprehensive papers.
However, in the teaching of middle schools in most provinces and cities, it is still suggested to use the equal sign when writing inorganic chemical reaction equations according to textbooks, so as to better express the meanings of "generation" and "conservation of mass" in the reaction.
In 20 13 middle school, inorganic reaction equations always connect reactants and products with equal signs, organic reactions always connect reactants and products with arrows, and reversible reactions are always represented with reversible symbols.
Second, the reaction conditions:
1. Write the reaction conditions of chemical equations. Generally, δ is marked above the equal sign. Most fine-tuning coefficients cannot be fractions (except that they can be reduced to each other).
2. The reaction can be carried out at normal temperature and pressure without writing conditions; However, if there are specific conditions for the experiment in the topic, the specific conditions (such as heating) will be marked.
3. When responding to a single condition, all conditions should be written on it; If there are two or more conditions, what cannot be written above should be written below; When there are both catalysts and other reaction conditions, be sure to write the catalyst on it.
4. The bidirectional arrow indicates the reversible reaction.