"Physical Properties and Chemical Properties" PPT download

Description

"Physical Properties and Chemical Properties" PPT download

Part One: Classroom Questions

Question: There are two bottles of gas, one of which is oxygen (O2) and the other is carbon dioxide (CO2). Is there any way you can distinguish them? (The more methods, the better)

Distinguish between oxygen (O2) and carbon dioxide (CO2):

Method 1: Use burning wood sticks. The gas that can extinguish the burning wood sticks is carbon dioxide (CO2);

Method 2: Use wooden sticks with sparks. The gas that can re-ignite the wooden sticks with sparks is oxygen (O2).

Physical and chemical properties PPT, part 2 content: student activities

Student activity 1:

Determine whether the following changes are physical changes or chemical changes?

⑴The ice melts;___________;

⑵Iron blocks are drawn into wire; ___________.

⑶Steel rusts;___________;

⑷Water turns into water vapor; ___________.

⑸Apple rot;___________;

⑹ wood made of desks; ___________.

1. Physical changes and chemical changes

1.Definition:

Physical change: A change without the formation of new matter.

Only the shape, state, size, temperature, etc. of the object have changed. Such as: pencils break, candles melt, light bulbs glow, etc.

Chemical change: A change in which new substances are formed.

It is generally accompanied by luminescence, heat generation, gas generation, precipitation, discoloration, etc. Such as: candle burning, food corruption, etc.

Student Activity 2: Teachers and students discuss together.

1. During physical changes, the substance itself does not change, so what does it change?

2. What is the key to judging chemical changes? How do we know that new substances are generated when substances change?

3. When physical changes occur, do chemical changes occur at the same time? When a chemical change occurs, does a physical change occur at the same time? for example.

2. Physical and chemical properties

1.Definition:

Physical properties: Properties that a substance can exhibit without chemical changes. Such as: color, state, smell, solubility, hardness, conductivity, etc.

Chemical properties: Properties of substances that require chemical changes to manifest themselves. Such as: flammability, oxidizing, reducing, acidic, alkaline, toxic, etc.

Physical and chemical properties PPT, part 3: practice

1. Which of the following changes are physical changes ( ) and chemical changes ( ).

A. Broken chalk B. Burning wood

C. Broken glass D. Burning of magnesium ribbon

E. Water turns into ice F. Food spoilage

G. The light bulb emits heat after being energized.

H. Paraffin melting J Gunpowder explosion K Tire explosion

2. Fill in the number on the horizontal line after the following phenomenon,

A. Physical changes, B. Chemical changes, C. Physical properties, D. Chemical properties.

(1) Calcining limestone to produce quicklime

(2) Magnesium strips can burn in air

(3) Ammonia is a colorless gas with an irritating odor. This is the characteristic of ammonia.

(4) The perfume evaporates into the air

3. Which of the following changes are physical changes ( )

A. Use plasticine to make Transformers

B. Making iron from iron ore

C. Steel is rusty

D. coal cake burning

Physical properties and chemical properties PPT, Part 4 content: Expansion:

Biological respiration consumes oxygen and produces carbon dioxide.

Can you design an experiment to prove that your breath contains carbon dioxide?

Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, physical properties and chemical properties PPT download, .PPT format;

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Update Time: 2024-11-22

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 1 industry PPT template

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