"Unit of quantity of matter - mole" PPT courseware on quantity of matter

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"Unit of quantity of matter - mole" PPT courseware of quantity of matter

Part 1: Essential knowledge and foundation of literacy

1. Amount of matter, Avogadro’s constant

1. Amount of substance

(1) The amount of substance and its unit

①The amount of a substance represents the aggregate containing _____________

Physical quantities are represented by the symbol __.

②Unit of quantity of substance - mole

【Think about it】

Do 1 mol H, 1 mol H+, and 1 mol H2 have the same meaning? Why? Can we say 1 mol of rice?

Tip: The meanings are different; although they are all 1 mole of particles, the types of particles are different. They respectively represent 1 mole of hydrogen atoms, 1 mole of hydrogen ions and 1 mole of hydrogen molecules; mol can only be followed by microscopic particles such as molecules and atoms, not rice. , tables and other macroscopic substances.

(2) The seven basic units in the International System of Units (SI)

【Situation·Thinking】

After studying the physical quantity "quantity of matter" and doing a lot of related exercises, the four masters and disciples of Tang Seng launched a heated discussion on the concept of quantity of matter based on their personal learning experience. The following is a transcript of the conversation between the four people. Whose opinion do you think is wrong?

Tip: The amount of matter is a physical quantity that can only be used to describe the amount of microscopic particles, while quality is a physical quantity that can describe both microscopic matter and macroscopic matter. The two are not interchangeable, so Sun Wukong's description is wrong.

2.Avogadro’s constant

(1) According to international regulations, the number of particles contained in 1 mol of particle aggregates is approximately __________.

(2) Avogadro's constant is the number of particles in 1 mol of any particle. The symbol is __ and the unit is _____.

(3) The relationship between the amount of matter, Avogadro’s constant and the number of particles (N): n=____.

【Smart Judgment】

(1) The amount of matter can be understood as the number of microscopic particles of matter. ()

Tip:×. The amount of matter is a physical quantity, not a number.

(2)Avogadro’s constant is 6.02×1023. ()

Tip:×. Avogadro's constant is not only a number, but also has a unit: mol-1.

2. Molar mass

[Think about it] (1) The molar mass of a particle is 1 mol. Is this statement correct? Why?

Hint: Wrong. The unit of molar mass is g·mol-1, and the unit of mass of substance is g. The two have different meanings.

(2) It is known that the mass of an oxygen atom is about 2.657×10-23 g. Please calculate the molar mass of O2? What is its relationship with the relative molecular mass of O2?

Tip: M(O2)=2.657×10-23 g×6.02×1023 mol-1

×2=15.995 g·mol-1×2=31.99 g·mol-1. The molar mass of oxygen is measured in g·mol-1, which is numerically equal to the relative molecular mass of oxygen.

The unit of quantity of matter, mole PPT, part 2 content: key abilities and literacy formation

Knowledge point 1: Conceptual understanding related to the quantity of matter

[Key points to clarify doubts]

1. Understanding of basic concepts

2. The relationship between the amount of matter, Avogadro’s constant and 6.02×1023

(1) The amount of matter represents a collection of microscopic particles.

(2) 6.02×1023 also represents the number of microscopic particles. It is an approximate value. For example, 1 mol O2 contains NA oxygen molecules, or approximately 6.02×1023 oxygen molecules.

[Error-prone reminder] Points of attention when applying the amount of substances

(1) "Amount of matter" is a physical quantity, and the unit is mole. The amount of matter can only represent the number of microscopic particles.

(2) When using mole, the type of particles must be specified. For example, 1 mol H2 contains 2 mol H, and the amount of H2 containing 1 mol H is 0.5 mol.

(3) It has "additive" properties to specific particles. For example, 1 mol CO contains 2 mol atoms (including 1 mol C and 1 mol O), and 1 mol SO3 contains 4 mol atoms (including 1 mol S and 3 mol O).

【Think·Discussion】

(1) Is the statement 1 mol of oxygen correct? Why?

Tip: When using mole, you must specify the type of particle. 1 mol of oxygen can represent not only oxygen atoms, oxygen molecules, but also oxygen ions. The oxygen reference here is not clear, so the statement of 1 mol of oxygen is incorrect.

(2) Does 1 mol of any substance contain 6.02×1023 molecules? Why?

Tip: Not necessarily. Substances are not necessarily composed of molecules. Some substances do not contain molecules, such as NaCl.

(3) Is the molar mass of 2 mol H2O twice the molar mass of 1 mol H2O? Why?

Hint: No. The molecular composition of a substance is determined, and its molar mass is a determined value.

【Case Demonstration】

[Typical example] Which of the following statements is wrong ()

①The mole is one of the seven basic physical quantities in the International System of Units;

②1 mol of any substance contains approximately 6.02×1023 atoms;

③6.02×1023 is Avogadro’s constant;

④The molar mass of a hydrogen atom is 1 g;

⑤The molar mass of HCl is equal to the mass of 1 mol HCl molecule;

⑥1 mol CO2 contains 1 mol carbon and 2 mol oxygen;

⑦The number of 12C contained in 0.012 kg of 12C is 1 mol.

A.①②③B.②③④

C.②③④⑥　D.All

Knowledge Point 2: The relationship between the amount of matter, the quality of matter, and the number of particles

[Key points to clarify doubts]

1.Basic relations

(1)n=____(n represents the amount of material, N represents the number of particles). The unit of NA in the relationship is mol-1.

(2)M=____(M is the molar mass, m is the mass of the substance).

Among M, n and m, if any two terms are known, find the third term; if the unit of M is g·mol-1, then the unit of m is g.

2. Identity relationship expression

By n=____ and n=____. The identity relationship can be obtained:____=n=____.

In N, NA, m, M, if any three terms are known, the fourth term can be found. Under normal circumstances, NA and M are known, then N and m can be determined from each other.

3. Calculation method of molar mass

(1) When the mass of a substance in any state is known: M=____ (definition formula).

(2) When the mass of a molecule is known: M=m(molecule)×NA.

(3) When the mass of a molecule and the mass of a 12C atom are known:

M=____×12 g·mol-1

Keywords: PPT courseware for high school chemistry compulsory course 1 from the People's Education Press is free to download, the unit mole of the amount of a substance is available for download, PPT download for the amount of a substance is available, .PPT format;

For more information about the PPT courseware "Amount of Substance, Unit of Amount of Substance, Mol", please click on the Amount of Substance, Unit of Amount of Substance, Moles PPT tag.

"Unit of Amount of Substance - Mole" PPT download of Amount of Substance:

"The unit mole of the amount of matter" The amount of matter PPT download Part 1 content: Literacy goal 1. Understand the meaning and standard of the amount of matter and its unit mole through analogy with familiar physical quantities and their common units, cultivate evidence reasoning and model cognition Ability. 2. When receiving...

"Unit of Amount of Substance—Mole" Amount of Substance PPT:

"The unit of mole for the amount of matter" PPT for the amount of matter Part 1: Goals and literacy: 1. Know the amount of matter, the unit and meaning of molar mass. (Macroscopic Identification) 2. Understand the meaning of Avogadro's constant, which is the basis for the quantity of matter. (Macroscopic identification and microscopic exploration...

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Update Time: 2024-09-09

This template belongs to Chemistry courseware People's Education Press High School Chemistry Compulsory Course I industry PPT template

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