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Physical and Chemical Changes
Topic 6. Chemical Energetics
26 February 2024
Slide 1 - Diapositive
Our Learning Map
Slide 2 - Diapositive
Our Learning Map
exercise mentally by completing classwork 6 to describe the extraction of iron in the blast furnace
- State the symbol equations for the extraction of iron from hematite
(a) C + O2 → CO2
(b) C + CO2 → 2CO
(c) Fe2O3 + 3CO → 2Fe + 3CO2
(d) CaCO3 → CaO + CO2
(e) CaO + SiO2 → CaSiO3
Slide 3 - Diapositive
Recall
(a) What are the three raw materials added to the top of the blast furnace?
(b) What chemical reactions are involved in iron extraction from hematite?
Slide 4 - Diapositive
Extraction of iron from hematite
Coke burns in the hot air, forming carbon dioxide. The reaction is exothermic, giving off heat and heating the furnace.
At the high temperatures in the furnace, more coke reacts with carbon dioxide, forming carbon monoxide. Carbon dioxide has been reduced to carbon monoxide.
Carbon monoxide reduces the iron(III) oxide in the iron ore to form iron. This will melt and collect at the bottom of the furnace, where it is tapped off.
Limestone (calcium carbonate) is added to the furnace to remove impurities in the ore. The calcium carbonate in the limestone thermally decomposes to form calcium oxide.
The calcium oxide formed reacts with the silicon dioxide, an impurity in the iron ore, to form calcium silicate. This melts and collects as a molten slag floating on the molten iron tapped off separately.
Slide 5 - Diapositive
Classwork 6 - Extraction of iron
Goal - Write the three raw materials added to the top of the blast furnace. Sequence (arrange) the steps in extracting iron from hematite by numbering them correctly. Write the word/symbol equations for the reactions in the arranged steps.
Product/Output - Completed worksheet
Standards - Correct responses.
timer
20:00
Slide 6 - Diapositive
Plenary Discussion
Slide 7 - Diapositive
Physical and Chemical Changes
Topic 6. Chemical Energetics
26 February 2024
Slide 8 - Diapositive
Our Learning Map
Slide 9 - Diapositive
Our Learning Map
exercise mentally by completing classwork 6 to describe the extraction of iron in the blast furnace
create a poster to show examples of physical and chemical changes and provide an explanation for your choice
Slide 10 - Diapositive
Our Learning Map
analyse a video about the complete extraction process of iron from hematite in the blast furnace
discuss further the differences between physical and chemical changes during the hinge-point discussion
create a poster to show examples of physical and chemical changes and provide an explanation for your choice
Slide 11 - Diapositive
Physical and Chemical Changes
Topic 6. Chemical Energetics
26 February 2024
Slide 12 - Diapositive
Chemical or Physical Change?
Slide 13 - Diapositive
Correcting Misconception
All changes involving substances are chemical changes.
Slide 14 - Diapositive
Correcting Misconception
All changes involving substances are chemical changes.
Slide 15 - Diapositive
Physical and Chemical Changes
Topic 6. Chemical Energetics
26 February 2024
Slide 16 - Diapositive
Collaborative work - Physical and Chemical Changes Poster
Goal and output - Create a poster (using colouring and art materials) to show examples of physical and chemical changes; include at least 2 reasons why your examples show physical and chemical changes
Standards - examples of changes, artistic expression, reasons provided, neatness and presentation
