GCSEOCR Core Science C2b Part 2 - Collins Education

earthwhistleUrban and Civil

Nov 25, 2013 (3 years and 6 months ago)

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Module C2

Item C2b

Part 2


Construction materials


In this lesson students should learn:



about the difference between cement and concrete



about the concept of composite materials



the reasons for the strength of reinforced concrete



about thermal decomposition



about some of the environmental aspects of m
ineral
extraction


Other Items in this book

C2c





ICT

Internet research


Student book pages 140
-
141

Worksheets C2b 4, C2b 5, C2b 6

Technician’s notes C2b 2



cement

composite

compression

concrete

mortar

tension

thermal decomposition



I can

safely heat a sample of a chemical in a test tube

1 point

I can make and test samples of concrete for their strength.

3 points



Activities



List any quarries (gravel extraction sites) and large construction sites in the area.



If there are any local qu
arries, list the ways in which the material is exported from the
area. If not, list ways in which such materials are imported.



Show video clips of mining/quarrying.

Resources






Technician’s notes C2b 2



Learning outcomes



State that limestone and marb
le are both forms of calcium carbonate



Describe that limestone thermally decomposes to make calcium oxide and carbon dioxide



Describe that concrete is made when cement, sand or gravel and water are mixed together and allowed to set



Describe that concrete c
an be reinforced, by allowing the concrete to set around a steel bar



State the word equation for the decomposition of limestone



Describe thermal decomposition as a reaction in which when heated one substance is chemically changed into at least two
new subs
tances



Describe that cement is made when limestone and clay are heated together



Describe reinforced concrete as a composite material containing concrete and a solid steel support

Teaching and learning activities

Resources

Class experiment


Limestone. Th
e students will carry out a number of tests on limestone
and marble chip. Before they begin, establish that limestone and marble are both forms of
calcium carbonate and ensure they know the formula, CaCO
3
.



Worksheet C2b 4



Technician’s notes C2b 2


Teachin
g and learning activities

Resources

Alternatively, students can use the Internet to produce a poster on the need for and
problems of mineral extraction.

Class experiment


Testing concrete bars. Explain to the class that they are going to test
the strengt
h of the concrete bars they made yesterday. To do this they will hang a metal
bucket from a concrete bar supported between two stools. They should load 1 kg masses
into the bucket until the bar breaks and record the mass supported by each bar. Ensure that
the floor is protected, for example with strong board. This will also reduce noise. This
experiment will need to be heavily supervised and may be better as a class demonstration.

Introduce the term ‘composite materials’.



Technician’s notes C2b 2




Technicia
n’s notes C2b 2



Learning outcomes



State the word equation for the decomposition of limestone



Describe thermal decomposition as a reaction in which when heated one substance is chemically changed into at least two
new substances



Describe that cement i
s made when limestone and clay are heated together



Describe reinforced concrete as a composite material containing concrete and a solid steel support



State the balanced symbol equation for the decomposition of limestone



Explain why reinforced concrete is a

better construction material than non
-
reinforced concrete

Teaching and learning activities

Resources

The class experiment detailed above


Limestone. This can be extended for more able
students using Worksheet C2b 5, which investigates the thermal decom
position of copper
carbonate.

Class experiment


Testing concrete bars. For more able students, this experiment (detailed
above) should include the different mixtures they used for concrete and bars made with
different reinforcing rods.

Discuss reinforced
concrete as a composite material, including reasons for its strength.



Worksheet C2b 5



Technician’s notes C2b 2




Technician’s notes C2b 2



Activities



Activity on the thermal decomposition of calcium carbonate.



Students to write down five things learned

in the lesson. Compile a class list on the
board.

Resources



Worksheet C2b 6



LOW DEMAND


7

Calcium carbonate


8

Two from: grass it over; use it as a
landfill and then grass it over;
recreational lake

STANDARD DEMAND


9

Check that students’ explana
tions
are accurate

HIGH DEMAND

10

Answer should discuss flexing,
tension, behaviour under tension