"Conditions of Combustion" Fuel and its Utilization PPT Courseware 7

Description

"Conditions of Combustion" Fuel and its Utilization PPT Courseware 7

[Inductive improvement]

The conditions for combustion are that combustibles, oxygen, and temperature reach the ignition point. All three are indispensable. When designing experiments to verify each condition, attention should be paid to determining the variables of the experiment and controlling irrelevant variables. If you want to explore the condition that oxygen is required for combustion, you need to select the same combustibles, and the temperature reaches the ignition point, and then compare whether combustion will occur with and without oxygen to determine the impact of oxygen on combustion.

[Application Example]

Example: A chemistry interest group uses three experimental materials: matches, candles, and beakers to explore the conditions for burning substances.

[Ask a question] What conditions are needed for a substance to burn?

[Conjectures and Assumptions] 1. There are flammable materials;

2. The temperature should reach the ignition point;

3. Contact with oxygen (or air).

[Reflection and Question 1] Hydrogen can burn in chlorine. Does combustion require oxygen?

[See information 1] Magnesium strips can burn violently in air or carbon dioxide, emitting dazzling white light and releasing a large amount of heat; thin iron wires can burn violently in chlorine, releasing a large amount of heat and producing a large amount of brown color smoke; phosphorus can burn violently in chlorine, releasing a lot of heat and producing a lot of white smoke.

[Expression and communication] According to the above content and the description of "combustion" in the textbook, you think that a violent chemical reaction that emits light and releases heat is called combustion.

[Reflection and Questioning 2] According to the experimental phenomenon of "thin iron wire burning in oxygen", why does the thin iron wire "spark" when burning in oxygen?

[See information 2] When the carbon-containing thin iron wire burns, the CO2 gas generated by the carbon particles forms bubbles in the molten liquid material. The bubble explosion of the molten liquid material causes the phenomenon of "sparks shooting".

[Designed experiment] In order to verify the reason why thin iron wires burn in pure oxygen to produce the "sparks" phenomenon, the experimental plan you designed is to take carbon-free thin iron wires and carbon-containing tincture wires of equal length and thickness, and place them at enough times respectively. Burn in a certain amount of oxygen and observe the phenomenon (any reasonable answer is acceptable).

On-site testing

1. Which of the following does not belong to the combustion conditions of substances ()

A. Narrow space B. Contact with oxygen

C. The temperature reaches the ignition point D. The substance is flammable

2. The ignition point of a certain substance is t ℃. In Figure S3-1, the point where the substance burns most vigorously is ()

A.Q point B.N point C.P point D.M point

3. Light two matches respectively, and place the head of one match vertically upward and the head of the other match diagonally downward (as shown in Figure S3-2). In which case is it easier for the match to continue burning? The reason for a match that is tilted downward is that when the match head is tilted downward, the heat generated by combustion can preheat the match stem, making it easier to reach its ignition point, so it is easier to continue burning (or when the match head is upward, the heat generated by combustion will increase with the heat). The rising air cannot heat the match stem, and the match stem cannot reach its ignition point and is easily extinguished).

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"Conditions of Combustion" PPT courseware 3:

"Conditions of Combustion" PPT Courseware 3 Question 1: What is combustion? Combustion is usually a violent oxidation reaction between combustibles and oxygen that produces light and heat. Question 2: What are the conditions for combustion? 1. There must be combustible materials; 2. It must be in contact with oxygen (or air)..

"Conditions of Combustion" PPT Courseware 2:

"Conditions of Combustion" PPT courseware 2 Activity 1: Guess the conditions of 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. ②Analyze the main reason why the candle went out and guess what...

"Conditions of Combustion" PPT courseware:

"Conditions of Combustion" PPT courseware What are the conditions of combustion? 1. There must be combustible materials; 2. It must be in contact with oxygen (or air); 3. The temperature reaches the ignition point of combustible materials. Experimental goals 1. Understand the conditions of combustion; 2. In the process of exploring the combustion conditions of substances..

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Update Time: 2024-10-13

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