"Exploration of the Properties of Matter" Everyone Comes to Learn Chemistry PPT Courseware

Description

"Exploration of the Properties of Matter" Everyone Comes to Learn Chemistry PPT Courseware

1. Properties of matter

Chemical properties: properties that a substance can show through chemical changes

Such as: flammability, reduction, oxidation, stability, etc.

Physical properties: properties of matter that can be expressed without chemical changes

Such as: color, state, odor, melting point, boiling point, hardness and density of substances (can be measured by direct observation or physical methods)

Difference: Whether it needs to be expressed through chemical changes

Notice:

The changes and properties of matter are different in description. When describing the properties of matter, there are words such as "can", "energy", "easy", and "will".

For example: magnesium burning is a chemical change;

Magnesium can burn, which is the chemical property (flammability) of magnesium.

Assumptions and Predictions

Hypothesis 1: The black substance is soot

a. If it is soot, it can be easily wiped off;

b. The flame does not come into contact with the copper sheet and does not turn black.

Hypothesis 2: The copper sheet reacts with oxygen in the air to produce a black substance.

Isolated from air (vacuum) and heated, it will not turn black.

Explanation and conclusion

Conclusion: The black substance is a new substance generated by the reaction of copper and oxygen.

Explanation: Copper reacts with oxygen under heating conditions to form black copper oxide

practice

①Gurgling water can evaporate into water vapor

②Water vapor can turn into white clouds in the sky

③The white clouds turn into raindrops or snowflakes and fall to the ground

④Iron ore is smelted into iron and steel

⑤Steel will rust

⑥ Coal burns, leaving a pile of ashes.

Please analyze, among them, ______ are physical properties, ______ are chemical properties; ______ are physical changes, and ______ are chemical changes.

knowledge consolidation

1. Which of the following are the physical properties of oxygen ( )

A Oxygen can make food rot B Oxygen can make steel rust

C Oxygen can supply animals with breathing D Oxygen can liquefy into light blue liquid

2. Which of the following are chemical properties of metallic copper ( )

A The copper sheet turns purple. B The copper sheet turns black when heated in the air.

C copper wire is very conductive D copper has a density of 8.9g/cm3

3. Among the following properties of nitrogen, the chemical properties of nitrogen are ( )

A is a colorless and odorless gas at room temperature.

B can turn into a colorless liquid or snow-like solid under low temperature and high pressure

C can react with hydrogen to become ammonia under high temperature, high pressure and catalyst conditions.

D is extremely insoluble in water

Experimental inquiry is the basic way to learn chemistry. Based on the exploration of the chemical properties of metallic copper, please complete the following questions:

1. The copper sheet turns black when heated because of the chemical reaction between the copper sheet and the metal.

2. When the copper sheet is heated in the air, the literal expression of the reaction is: ___________.

3. Expansion and migration: If you use a vacuum pump to remove the air in the test tube containing the copper sheet, or fill the test tube containing the copper sheet with nitrogen, and then heat it, the copper sheet _____ ("yes" or "no") will change black. If aluminum is heated in air, the literal expression for the reaction that occurs is: __________.

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Update Time: 2024-10-02

This template belongs to Chemistry courseware Cantonese Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

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