"Molecules and Atoms" The Mystery of Material Composition PPT Courseware 2

"Molecules and Atoms" The Mystery of Material Composition PPT Courseware 2

1. Learning objectives:

1. The composition of molecules and the substances composed of molecules and atoms (key points)

2. Explain physical changes and chemical changes from the perspective of molecules and atoms (difficulty)

2. Independent learning:

Knowledge point 4: Molecules and atoms constitute matter

1. A substance composed of molecules, which are the smallest particles of _______. The molecular chemical properties of the same substance are ________, and the molecular chemical properties of different substances are ________.

2. Atoms are also particles that make up _______, each with certain chemical properties; atoms are the smallest particles in _______.

Knowledge point 5: Explain physical changes and chemical changes from the perspective of molecules and atoms:

1. The molecular perspective

① When a substance composed of molecules undergoes ______ changes, the molecules themselves do not change.

②When a substance composed of molecules undergoes ______ changes, the molecules themselves change and become molecules of other substances.

2. Atomic point of view: In physical changes and chemical changes, atoms ______ change.

3. Collaborative exploration

Study 1: The composition of molecules

1. Oxygen molecules are made of ________; an oxygen molecule is made of ________.

2. Water molecules are made of ________. A water molecule is made of ________.

Exploration 3: Explain physical changes and chemical changes from the perspective of molecules and atoms

Discussion textbook P51: The changes in molecules and atoms during the combustion of hydrogen in chlorine. Infer that the changes that occur in chemical changes are molecules or atoms?

What changes in chemical changes is ______; what does not change is ______; atoms are the smallest particles in ______.

The essence of chemical changes: In chemical changes, molecules break down into ______ and ______ recombine to form ______.

5. Self-assessment [Classroom Exercise] Textbook P52 Question 3

1. Among the following statements about molecules and atoms, which one is correct ( )

A. The molecular mass is greater than the mass of the atom

B. Molecules can move but atoms cannot move

C. Molecules can constitute matter but atoms cannot constitute matter.

D. In chemical reactions, molecules can be divided but atoms cannot.

2. It is known that “o” and “●” represent atoms with different numbers of protons.

(1) Among the gaseous substances represented below, which one is a compound ( )

(2) Among the gas substances represented below, which one is a mixture ( )

3. The main difference between molecules and atoms is ( ).

A. Large molecules and small atoms

B. The mass of molecules is large and the mass of atoms is small.

C. Molecules can directly form matter, while atoms must first form molecules and then form matter.

D. In chemical changes, molecules can be subdivided, but atoms cannot.

4. Microscopic simulation questions: Answer the following questions through the reaction diagram below:

(1) Substance C belongs to ___________ among pure substances (fill in the substance classification).

(2) The basic reaction type of this reaction is _______ reaction.

(3) Use the molecular and atomic point of view to explain the essence of chemical reactions____________.

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