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Thermal Decomposition Reactions Thermal Decomposition Reactions

Thermal Decomposition Reactions - PowerPoint Presentation

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Uploaded On 2016-02-28

Thermal Decomposition Reactions - PPT Presentation

Stable and Unstable Substances Stable in Chemistry means unreactive in the conditions stated Unstable means reactive in the conditions stated Thermal Decomposition When 2 elements combine to form a compound the product requires heat energy for the elements to be reformed ID: 234201

thermal metal copper decomposition metal thermal decomposition copper stable carbonate activity carbonates compounds compound thermally energy metals elements calcium solid hydrogen unstable

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Presentation Transcript

Slide1

Thermal Decomposition ReactionsSlide2

Stable and Unstable Substances

Stable in Chemistry means

unreactive

in the conditions stated.

Unstable means reactive in the conditions stated.

Slide3

Thermal Decomposition

When 2 elements combine to form a compound, the product requires heat energy for the elements to be reformed.i.e. the compound is more stable than the elements at room temperature.Many compounds undergo thermal decomposition – the compound breaks up into compounds of lower mass, or into its elements.Slide4

Thermal Decomposition

The thermal stability of a metal compound is directly related to the chemical activity of the metal.Sodium compounds are the most thermally stable.Gold compounds do not exist because they are thermally unstable.Slide5

Activity Series of Metals

By observing the reaction of metals with oxygen, acid and water, it is possible to arrange the metals in an order of activity.This is the activity series.

Potassium > Sodium > Lithium > Calcium > Magnesium > Aluminium > Zinc > Iron > Lead > (hydrogen) > Copper > Silver > GoldSlide6

Metal Carbonates and Metal Hydrogen Carbonates

The conditions required for the decomposition of metal carbonates and metal hydrogen carbonates depend on the chemical activity of the metalSodium and potassium carbonate are thermally stable and can not be decomposed by heating.Slide7

Metal Carbonates and Metal Hydrogen Carbonates

Highly reactive metals form stable compounds that require high energy to undergo thermal decomposition. Calcium carbonate – the high reactivity of calcium metal results in a stable compound and thus high energy is needed to decompose calcium carbonate. Slide8

Thermal Decomposition of Copper Carbonate

Copper is low in the activity series so, copper carbonate is thermally decomposed with low energy. The equation is:

CuCO

3(s)

CuO

(s)

CO

2(g)Slide9

Thermal Decomposition of Copper Carbonate

Copper carbonate is a green powder, on gentle heating, it decomposes into copper oxide, a black powder and carbon dioxide gas.Slide10

Thermal Decomposition of Iron II Hydroxide

Fe(OH)2(s)

FeO

(s)

H

2

O

(g)

Green solid

Black solid – changes to rust red on contact with air.Slide11

Thermal Decomposition of

Copper HydroxideCu(OH)

2(s)

CuO

(s)

H

2

O

(g)

Blue-Green solid

Black solid