"Conditions of Combustion" PPT Courseware 2

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"Conditions of Combustion" PPT Courseware 2

Activity 1: Guess the conditions for combustion

1. Requirements: ① Please use the supplies provided below to extinguish 4 candles in different ways, and record the methods used in the group experiment record sheet. ② Analyze the main reasons why the candle goes out and guess the conditions required for material burning.

2. Supplies provided: 4 candles, matches, 1 250mL beaker, 3 100mL beakers, 2 100mL beakers (one contains water and the other contains fine sand), scissors.

3. Information: The ignition point refers to the minimum temperature required for a substance to reach combustion.

Activity 2: Explore the conditions of combustion

1. Requirements: Please use the following supplies provided to design an experimental plan to prove your conjecture about the combustion conditions of substances, and record it on the group record sheet. (Note that only experimental protocols are discussed.)

2. Supplies provided: matches, two candles, a large beaker, an alcohol lamp, a tripod, a thin copper sheet, 2 tweezers, a table tennis ball (the ignition point is about 180°C), and a filter paper (the ignition point is about 245°C).

3. Experimental exploration:

(1) Combustible materials are required.

(2) Exploration content: Need to be in contact with oxygen.

Experimental program:___________________;

Experimental phenomena:___________________;

Experimental results:____________.

(3) Research content: The temperature needs to reach the ignition point.

Experimental program:___________________;

Experimental phenomena:___________________;

Experimental results:_____________.

Activity Three: Apply what you learn

1.Why don’t ordinary handkerchiefs burn in magic tricks?

The burning of alcohol causes the water to evaporate and absorb heat, causing the temperature to fail to reach the ignition point of the handkerchief.

2. In the "water and fire compatibility" magic, why can white phosphorus burn in hot water?

Because the large test tube contains oxygen.

3. Can a candle be snuffed out because there is no flammable material? What is the real cause of its extinction?

4. If the oil pan catches fire while cooking, what will you do?

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Update Time: 2024-10-20

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

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