"Changes of Matter" Everyone Comes to Learn Chemistry PPT Courseware

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"Changes of Matter" Everyone Comes to Learn Chemistry PPT Courseware

Review the past and learn the new

1. What is the learning content of chemistry class?

2. What are test tubes and beakers used for?

3. Why is it necessary to use the outer flame of an alcohol lamp to heat substances?

4. After heating the solid in the test tube, it was found that the test tube burst. What is the possible reason?

observation activities

spray writing

experimental method:

Use a sprayer filled with a certain solution to spray it on a piece of white paper and observe what happens?

Experimental phenomenon: Four big red characters "Chemical Change" appear on the white paper

Experimental thinking: What issues do you think of when writing with spray?

To learn, you must first learn to ask questions!

Summary and summary

(1) Physical changes

1. Concept: Changes in substances that do not produce new substances when they change

2. Characteristics: No new matter is generated, only changes in shape and state (gas, liquid, solid)

3. Examples: changes in the three states of matter, changes in shape, dissolution, evaporation, and light bulbs

(2) Chemical changes

1. Concept: Changes in substances that create new substances when they change. (also called chemical reaction)

2. Features: New substances are generated.

3. Examples: combustion, rusting, respiration, photosynthesis, wine making, vinegar making, iron ore making, etc.

(3) Text expressions of chemical changes

Three notes:

1. The substances before the reaction (reactants) are written on the left;

2. The generated substances (products) are written on the right;

3. Connect with arrows and write the reaction conditions above the arrows.

4. When there are more than one types of reactants and products, use "+" to connect them.

Practice writing text expressions

1. Phosphorus and oxygen generate phosphorus pentoxide under ignition conditions

2. Copper is heated in oxygen to form copper oxide

(4) Methods of observing chemical experiments:

1. Observe the reactants before the experiment: color, state, smell, etc.

2. Experimental phenomena that occur during the experiment: such as whether there is light, heat, discoloration, gas release, precipitation, etc.

3. Observe the products after the experiment: such as color, state, smell, etc.

Pay attention to distinguishing phenomena and conclusions:

Phenomenon: Perceiving through various sensory modalities such as seeing, smelling, hearing, and touching is an objective fact that directly affects our sensory organs.

Conclusion: Analyze the phenomenon and draw it through reasoning.

Class exercises

1. What kind of changes do the following examples in life belong to? Why?

A broken glass B milk turned sour C copperware rusted D firewood burning

E Glucose brewing F Natural gas burning G Ice and snow melting H Setting off firecrackers

I Tire explosion J Landslide K Evaporation of sea water L Photosynthesis

2. Which of the following changes is a chemical change ( )

A. The light bulb generates heat and glows when it is powered on.

B. Cover the beaker with ice cubes and there will be water droplets on the wall of the beaker.

C. Boiler explosion

D. Cover a beaker above the candle flame with water droplets on the inner wall of the beaker

3. Among the following descriptions of experimental phenomena, which one is correct ( ).

A. After adding sodium hydroxide solution to magnesium chloride solution, magnesium hydroxide precipitates.

B. Carbon dioxide gas is released after the reaction between hydrochloric acid and baking soda.

C. Magnesium strips burn to produce white magnesium oxide

D. When carbon dioxide is passed into clear lime water, the lime water becomes turbid.

Homework

1. What are the characteristics of physical changes and chemical changes?

2. Which of the following phenomena are physical changes and which are chemical changes? Why?

(1) Wet clothes become dry after being exposed to the sun.

(2) Copper forms a patina in humid air.

(3) Paper burning. (4) The porcelain bowl was broken.

(5) Iron rusts. (6) Paraffin wax melts.

(7) Breathing in front of glass in the cold winter will cause a layer of water vapor to appear on the glass.

(8) On a snowy day, put a ball of snow in a warm room and the snow will melt.

3. Textbook pages 19-20 1 and 2

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Update Time: 2024-11-23

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

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