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Explosive Decomposition When a substance is touched at length it explodes with a loud bang.

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Presentation on theme: "Explosive Decomposition When a substance is touched at length it explodes with a loud bang."— Presentation transcript:

1 Explosive Decomposition When a substance is touched at length it explodes with a loud bang

2 Purpose  To observe an explosive decomposition reaction  To understand the reason the substance is explosive

3 Demonstration  Because the iodine atoms repel each other the molecule was unstable and detonated with the slightest vibration  The chemical equation for the chemical reaction was 8 NH 3 NI 3 5 N NH 4 I + 9 I 2

4 Concepts 1.Decomposition Reactions 2.Atomic Size 3.Redox Reactions

5 1.Decomposition Reactions  General Form is ABA+B The substance AB has broken apart into two new substances, A and B  In this demonstration AB is the substance nitrogen triiodide, NI 3

6 2.Atomic Size (I)  Atoms are spherical but have different sizes  The relative sizes can be predicted from Periodic Trends on the Periodic Table Period (horizontal row) Group (vertical row) Slight decrease in size for most part Large increase

7 Atomic Size (II)  The substance in this demonstration is nitrogen triiodide, NI 3  The relative size of atomic radii are Nitrogen 0.75 Iodine 1.32  The molecule therefore looks like this Bulky iodine atoms surround the smaller nitrogen atom Iodine electrons repel each other making the molecule unstable

8 3.Redox Reactions  In a redox reaction, one substance loses electrons while another substance gains electrons  “Redox” is a conventional term which is a combination of the words “reduction” AND “oxidation”  In this demonstration iodide is oxidized and nitrogen is reduced

9 Conclusions  Nitrogen triiodide was a very unstable compound which underwent a violent decomposition reactions  A knowledge of molecular structure was useful in understanding why nitrogen triiodide was explosive

10 Comments n Nitrogen iodide was first made in 1813 n Many seriously dangerous accidents have occurred when this and similarly unstable substances have detonated


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