This show or class experiment mirrors theexothermic reactionof twoelements,ironandsulfur, to kind thecompound, steel sulfide. The two solids room mixed and heated in a test tube (or ignition tube). The reaction deserve to be supplied to illustrateelements, mixturesandcompounds

This reaction deserve to be carried out as a show or class experiment in awell ventilatedlaboratory detailed that the instructions detailed here space strictly adhered to.

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The reaction can be lugged out in borosilicate glass check tubes together a demonstration or in smaller (ignition) pipe by students. The reaction gives an opportunity to show that the nature of a compound are different from its ingredient elements.

The reaction mustnotbe carried out on believe lids in the open up laboratory as is argued in part sources. The sulfur might boil or burn releasing sulfur dioxide which is a TOXICand CORROSIVEgas and may trigger an asthmatic attack.

Build a great plan about this experiment

This experiment deserve to be used as component of a lesson arrangement for 11–14 year olds, using bit models to explain the chemical readjust that wake up – watch Reacting iron and also sulfur to check out compounds.



Eye protectionBalance (1 or 2 decimal places)For the demonstrate the teacher will need:Test pipe made native borosilicate glass (eg Pyrex)Bunsen burnerHeat resistant matClamp stand and also clampSpatulas x2Small bar magnetWatch glassFilter paper (2 peices or use 2 weighing boats)Mineral wool (or mineral fibre)For the course practical each team of students will need:Prepared ignition tube (note 1)Bunsen burnerHeat resistant matTest tube tongs

Apparatus note

Ignition tube (75 mm x 10 mm test tubes) have to be filled come no much more than one quarter full with the iron–sulfur powder mix (see very first step the the demonstration proctasiilaq.netre). Utilizing 0.2 g that the mixture is enough for the effect to be seen. Location a small plug that mineral wool in the mouth of each ignition tube. ~ the experiment, the iron(II) sulfide is low hazard and can it is in discarded into the refuse.


Iron flour (potential IRRITANT)Sulfur – carefully powdered role or flowers

Health, safety and technical notes

Wear eye protection throughout and ensure the the laboratory is fine ventilated.Iron powder, Fe(s), (potential IRRITANT) – this can cause severe irritationin eyes due to the fact that the steel oxidises rapidly in the saline setting –see CLEAPSS Hazcard HC055a. Iron powder is desired to iron filings. If well sulfur flour is combined with iron filings, it is challenging to obtain a continual mix, due to the fact that the 2 solids deserve to separate.Sulfur, S(s) –seeCLEAPSS Hazcard HC096a. Roll sulfur or flower of sulfur should be finely powdered utilizing a pestle and also mortar.Sulfur dioxide, SO2(g),(TOXIC) is created if the sulfur records fire –seeCLEAPSS Hazcard HC097.



Prepare a mixture containing steel powder and sulfur flour in the proportion 7:4 by mass. Perform this through weighing the end 7 g of steel powder and 4 g of carefully powdered sulfur onto separate pieces the filter paper (or usage weighing boats). Mix the two powders by putting repeatedly from one piece of record to the various other until a homogeneous mixture (by appearance) is obtained.Note the illustration of the pure elements and also the mixture. Show that iron can be separated from the mixture by physical means. Perform this by pack the end of a tiny bar magnet in a paper tissue or cling film, and dipping it right into a teaspoon size heap the the mixture on a clock glass. The iron will be attracted, yet the sulfur stays on the watch glass.Place about 2 g of the mixture into a borosilicate check tube.Insert a plug that mineral wool (mineral fibre) into the mouth the the test tube. Clamp the test tube as presented in the diagram.Heat the flour mixture at the base of the test tube – gently at very first and then an ext strongly (use a blue fire throughout). Heat until one orange glow is checked out inside the check tube. Instantly stop heating. Allow the students view that the bright continues and also moves steadily with the mixture.Allow the test tube to cool down. At this suggest the student could bring out their own small scale version of the reaction.Once cool, it is possible to break open the test tube to present the illustration of the product, iron(II) sulfide. The test tube can be broken open using a pestle and mortar. The is advisable to wear protective gloves.It might be feasible to show that the product, iron(II) sulfide is non-magnetic. However, this is not constantly successful. It has actually been argued that utilizing a an extremely weak magnet is advisable.
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Class practical

Students need to be listed with pre-prepared ignition tube containing the iron–sulfur mixture and also a mineral structure plug.Using perfect tongs or test pipe holders, the iron-sulfur mixture in the tube need to be heated until it simply starts to glow. Bunsen burners must then it is in turned off.The ignition tubes should be left to cool on the heat resistant mat. It may be sensible to get the college student to location all their used ignitiontubes onto one heat resistant mat set aside because that this objective (eg ~ above the teacher’s desk or in a fume cupboard).

Teaching notes

On heater the reaction mixture, the sulfur melts and also reacts through the iron exothermically to type iron(II) sulfide. The mineral wool plug in the mouth that the test tube stays clear of sulfur vapour escaping and possibly catching fire. If, regardless of all precautions, the sulfur vapour go ignite, students should be trained to extinguish it by place a damp rag firmly over the mouth of the tube.

The indicators that a chemistry reaction occurs are: the glow, and also the reality that a brand-new substance (black steel sulfide) is developed which can not be be separated by using a magnet (see step 8 the demonstrationproctasiilaq.netre).

This may be an chance to present or reinforce the ‘rule’ that if only two aspects are an unified together, the surname of the compound ends in ‘ide’.

Exciting elements video containing the iron and sulfur reaction

Thedemonstration video for iron and sulfur reaction can be discovered at 7.20 minutes. It mirrors theexothermic reaction of 2 elements, iron and also sulfur, to type the compound, iron sulfide. The two solids room mixed and also heated in a test-tube (or ignition tube). The reaction have the right to be offered to highlight elements, mixtures and also compounds.

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Additional information

This is a resource from thePractical Chemistry project, occurred by the Nuffield foundation and the Royal culture of Chemistry. This arsenal of over 200 practical activities demonstrates a wide variety of chemical concepts and processes. Each task contains considerable information for teachers and also technicians, including full technical notes and also step-by-step proctasiilaq.netres. Handy Chemistry activities accompanyPractical PhysicsandPractical Biology.

Health & safety checked, 2016





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