chemistry unit 1 section 2

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limestone is a starting point for?
concrete and cement
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cement is made by?
heating powdered limestone and clay
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concrete is made by?
cement, gravel, sand and water also known as cement and mortar
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enviromental factors of quarrying limestone and building using concrete!
quarrying scars environment, but limestone is a valuable natural resource. concrete makes ugly structures but is strong and stable. quarrying creates noise, smell, light and atmospheric pollutants, but concrete is a good resource(malleable)
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economical factors of quarrying limestone and building using concrete!
jobs=more money and better value country, lower property value, and un-healthy lifestyle.
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CaCO3 or calcium carbonate, is made by what process?
Thermal decomposition
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and makes?
Calcium oxide
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complete equation, metal carbonate --> thermal decomposition=
= metal oxide + carbon dioxide
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do all metal carbonates in group 1 decompose at high temperatures reached my a laboratory bunsen burner (600'c)?
NO, not all decompose at that temperature.
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what is the result of reacting calcium oxides in water (H20)?
a calcium hydroxide and this can be tested by reacting carbon dioxide in limewater and watching at the water changes from clear to cloudy showing calcium carbonate is being produced.
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what is calcuim hydroxide, acid or alkali?
it is an alkali... can be used in fertilisers to help with controlling plant growth.
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carbons react with acids to produce?
carbon dioxide, a salt and water (H20)
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limestone is heated with clay to make cement, cement is mixed with sand and water to make mortar. what happens next?
the mortar is added to aggregated to make cement. Aggregate = gravel and water
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Card 2

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cement is made by?

Back

heating powdered limestone and clay

Card 3

Front

concrete is made by?

Back

Preview of the front of card 3

Card 4

Front

enviromental factors of quarrying limestone and building using concrete!

Back

Preview of the front of card 4

Card 5

Front

economical factors of quarrying limestone and building using concrete!

Back

Preview of the front of card 5
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