| Category | Format | Size |
|---|---|---|
| People's Education Press Ninth Grade Chemistry Volume 1 | pptx | 6 MB |
"Chemical Formula and Valence" Water in Nature PPT Courseware 2
Description
"Chemical Formula and Valence" Water in Nature PPT Courseware 2
teaching objectives
Knowledge and skills
(1) Understand the meaning of chemical formulas.
(2) Know the valence of some common elements and roots.
(3) Be able to use chemical formulas to express the composition of certain substances, and be able to deduce the valence based on chemical formulas.
Process and Method
Through the observation of pictures and tables, students can learn to organize, summarize and initially apply the knowledge of the country.
Emotional attitudes and values
Cultivate the scientific spirit of students who are good at cooperation, diligent in thinking, rigorous and realistic, brave in innovation and practice, and experience the joy of successful exploration.
Teaching focus
1. The meaning of chemical formula
2. Valencies of some common elements and valences of atomic groups
3. Use chemical formulas to express the composition of certain substances, and be able to deduce the valence based on the chemical formulas.
Teaching difficulties
Understanding and memorizing valence
Represent the chemical formula directly using element symbols.
1. Single substance
Metal element: iron aluminum
Solid non-metallic elements: sulfur and phosphorus
Noble gases: neon, helium
2. Compounds
Oxide:
magnesium oxide
Iron oxide
carbon dioxide
Phosphorus pentoxide
Infer valence based on chemical formula
1. The valency of an element in any element is set to 0
2. The algebraic sum of the valencies of each element in the compound is 0
3. Inference from pricing elements rather than the combined price of pricing elements
Give it a try and see how you master this lesson?
1. Formaldehyde (chemical formula: CHO) is one of the main pollutants in interior decoration. Which of the following statements is correct ( )
A Formaldehyde is composed of three elements: carbon, hydrogen, and oxygen.
BFormaldehyde is composed of carbon atoms and water molecules
C formaldehyde molecules are composed of carbon atoms, hydrogen molecules, and oxygen atoms
DFormaldehyde is composed of one carbon element, two hydrogen elements, and one oxygen element.
2. Use chemical symbols and numbers to express:
3 water molecules _____, 2 sulfur atoms ______, calcium ions _____, +5-valent phosphorus element ______
3. Mark the valence of the following elements with dots added
NO NO2 N2O5 HNO3 N2
KMnO4 K2MnO4
4. Try to determine the valence of the added elements in the following atomic groups.
NH4 SO4 CO3 NO3
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For more information about the "Chemical Formula and Valence of Water in Nature" PPT courseware, please click on the "Chemical Formula and Valence of Water in Nature ppt ppt" tab.
"Chemical Formula and Valence" Water in Nature PPT Courseware 7:
"Chemical Formula and Valence" Water in Nature PPT Courseware 7 1. What is a chemical formula 1. The concept of chemical formula: a formula that uses element symbols and numbers to express the composition of matter. (A substance corresponds to a chemical formula) 2. The meaning of chemical formula: Distinguish the number in front of the symbol..
"Chemical Formula and Valence" Water in Nature PPT Courseware 6:
"Chemical Formula and Valence" Water in Nature PPT Courseware 6 2. Valence In chemistry, valence is used to express the number of mutual combinations between atoms. An atomic group is a group of atoms that often acts as a whole in compounds and chemical reactions, also called roots. For convenience...
"Chemical Formula and Valence" Water in Nature PPT Courseware 5:
"Chemical Formula and Valency" Water in Nature PPT Courseware 5 1. Chemical Formula 1. Definition: A formula that uses a combination of element symbols and numbers to express the composition of a substance is called a chemical formula. For example: the chemical formula of water is H2O, the chemical formula of oxygen is O2, and the chemical formula of carbon dioxide is The chemical formula is CO..
File Info
Update Time: 2024-06-06
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