When the iron wire burns in oxygen, why should it be ignited, and can the iron wire not burn

1) The phenomenon of iron wire burning in oxygen is: burning violently, sparks in all directions, generating black solids, and releasing a large amount of heat; (2) The purpose of winding the wire into a spiral is to increase the contact area with oxygen and make the reaction more intense; (3) At the beginning of the experiment, the purpose of lighting the match first was to ignite the wire; (4) Iron wire is burned in oxygen to form ferric tetroxide, and the literal expression of the reaction is:

Iron + oxygen ignites ferric tetroxide, and the reaction produces a substance from two substances, which belongs to the chemical reaction reaction; (5) Since the oxygen in the air is diluted by nitrogen that does not support combustion, if the oxygen is replaced with air, the reaction cannot be carried out; (6) Combining (3) and (5), the experiment can conclude that the intensity of combustion of combustibles in oxygen is related to the concentration of oxygen and the contact area of combustibles with oxygen The measures that can be taken to make combustibles burn violently in life are to increase the concentration of oxygen or increase the contact area between combustibles and oxygen Therefore, the answer is: (1) Burning violently, sparks in all directions, generating black solids, and releasing a large amount of heat; (2) increase the contact area with oxygen to make the reaction more intense (3) ignite the wire; (4) Iron + oxygen ignites ferric tetroxide, chemical reaction; (5) No; (6) the concentration of oxygen; The contact area between combustibles and oxygen, increasing the concentration of oxygen, and increasing the contact area between combustibles and oxygen

The combustion of a substance must meet the following three basic conditions:

1) Combustibles: Regardless of solids, liquids and gases, any substances that can react violently with oxygen or other oxidants in the air are generally combustible substances, such as wood, paper, gasoline, alcohol, gas, etc.

2) Combustibles: Substances that can help and support combustion are called combustibles. Generally refers to oxygen and oxidants, mainly referring to oxygen in the air. This oxygen is called air oxygen.

3) Ignition source: Any energy source that can cause the combustion of combustible substances is called an ignition source, such as open flame, friction, impact, electric spark, etc.

Only when the above three conditions are met can the substance be burned. For example, a stove can only be lit if it has three conditions: wood (combustible), air (combustible), and match (fire source).

Iron burns in oxygen: 3Fe + 2O2 = ignition = Fe3O4

Phenomena: (1) Burning violently, sparks radiating (2) emitting heat (3) Forming a black solid.

Note: Put a small amount of water or fine sand at the bottom of the bottle to prevent the generated solid matter from splashing down and bursting the bottom of the bottle.

Experimental phenomena: 1. Burning violently, sparks in all directions.

2. Drain the heat.

3. Generate a black solid.

Iron Burning in Oxygen Chemical Formula: 3Fe + 2O2 = Ignition = Fe3O4 Note: Put a small amount of water or fine sand at the bottom of the bottle to prevent the generated solid matter from splashing down and bursting the bottom of the bottle.

The wire burns violently in oxygen, sparks in all directions, and produces a black solid melt that splatters down.

Bend a thin rust-free wire into a spiral shape and tie a matchstick to one end. Lighting a matchstick and immediately reaching into a gas cylinder containing oxygen (the bottle contains a small amount of water to prevent it from bursting), the iron (Fe) burns violently in the oxygen and sparks in all directions. After the combustion stops, you can see that there is a black-brown solid in the water on the wall and bottom of the bottle, and this black-brown solid formed in the reaction is called ferric tetroxide (Fe3O4).

Sparks fly, and a black solid is formed at the bottom of the bottle.

1.Burning violently, sparks everywhere; 2.Heat is released; 3.Generates a black solid.

Just listen to a loud bang, chemistry teacher**.

Iron wire burns in oxygen.

Type of reaction

reactants

Product catalyst

Reaction conditions

Reaction phenomenon. Burning violently, sparks everywhere;

Iron wire burns in oxygen, phenomenon: violently burning, sparks in all directions, generating black matter, emitting a large amount of heat.

Equation: 3Fe + 2O2 == Ignition = = Fe3O4

This is the same as phosphorus burning in oxygen to produce a lot of white smoke.

(1) The phenomenon of iron wire burning in oxygen is: violent combustion, sparks, generating black solids, and releasing a lot of heat;

2) The purpose of winding the iron wire into a spiral is to increase the contact area between the iron wire and oxygen, so that the iron wire burns more violently and the phenomenon is more obvious; Second, it is conducive to maintaining the temperature required for the burning of the iron wire, so that the iron wire continues to burn;

3) The purpose of lighting the match at the beginning of the experiment is to use the heat released by the match combustion to increase the temperature of the wire, reach the ignition point, and ignite the wire;

4) if oxygen is replaced with air, the reaction (cannot) proceed;

5) The conclusion that can be drawn from this experiment is that: combustibles usually burn more in oxygen than in air (violently); Substances that do not burn easily in the air do (burn) in oxygen

1) The phenomenon is a violent burning, and the sparks are radiating in all directions.

2) The purpose of winding the wire into a spiral is to increase the contact area between the wire and oxygen and increase the local temperature.

3) The purpose of lighting a match at the beginning of the experiment is to ignite the wire.

4) No, you can't. 5): Combustibles usually burn more violently in oxygen than in air; Substances that do not burn easily in the air (fill in "easy" or "not easily") can burn in oxygen.

Increase the contact area with oxygen, ignition, can't, violent, not easy, easy.

1 Releases a lot of heat, and Mars shines everywhere.

2 Increase the contact area with oxygen.

3 The match has a low ignition point and is easy to ignite (is it used to light an alcohol lamp......).4) No, you can't.

5 is more violent, not easy to burn, can be burned.

2. It is to increase the contact area.

3. It is convenient to trigger a reaction.

4) No, you can't. 5. Intense, not easy to burn.

The selected wire should be treated with sandpaper, and this change is a (physical) change.

The reason why the wire is wound in a spiral shape is (to increase the contact area with oxygen); The reason why a match is tied to the front end of the wire is (to bring the temperature to the ignition point of iron combustion); The reason why the bottom of the gas collection cylinder is pre-filled with a small amount of water or covered with a layer of fine sand (to prevent the resulting melt from splashing the bottom of the bottle) is the literal expression of the reaction (iron + oxygen ferric tetroxide, ignited above the arrow step), which is both an (oxidation) reaction and a (compound) reaction.

If oxygen is replaced with air, the chemical reaction (cannot proceed) because of the low concentration of oxygen.

1. Physical changes.

2. Increase the heating area with oxygen and ignite the wire to prevent the high-temperature melt from dripping and bursting the gas cylinder.

3. The wire burns violently, sparks scatters, radiates heat, and generates a black solid.

4. Iron + oxygen ---ignition) - ferric oxide chemical oxidation.

5. Iron cannot be burned in the air.

To correct a teaching error, not all iron cannot be burned in the air, but it will also burn when the contact area with the air reaches a certain level, and the iron powder can be burned in the air to form red iron oxide (ferric oxide).

Chemistry; Evenly heated; Heating and burning the wire; Prevent the beaker from being too high and bursting; The wire burns violently, emitting heat and emitting heat; Fe+O2 ---heating)--Fe3O4; Chemical combination; Oxidation; No; There is little oxygen in the air. That's what a coincidence, too, we learned.

Burning violently, emitting a large amount of heat, sparks in all directions, and generating a black solid Fe3O4.

:(1) burns violently, and Mars shines everywhere, (2) emits heat, and (3) produces a black solid.

Releases a lot of heat in all directions.