Age 14 - 16

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Properties of mixtures

Properties of mixtures

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Liquid mixtures

Liquid mixtures

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Mixture separation - evaporation
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Mixture separation - extraction

Mixture separation - extraction

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Separation of a mixture of liquids by distillation
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Properties of matter - boiling point
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Volume contraction of liquids

Volume contraction of liquids

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Dissolution of salts

Dissolution of salts

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Comparison of a physical process and a chemical reaction
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Reaction of copper and sulphur

Reaction of copper and sulphur

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Chemical process: synthesis and analysis
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The law of conservation of mass in chemical reactions
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The law of definite proportions in chemical reactions
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Test for hydrogen

Test for hydrogen

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Test for nitrogen

Test for nitrogen

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The importance of air for combustion processes
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Air, a mixture of substances

Air, a mixture of substances

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Structure and mode of operation of a Bunsen burner
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The candle flame

The candle flame

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Periodic system properties of a group of elements - Group 2
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Dipole properties

Dipole properties

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Water content of natural substances
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Dissolved components in different waters
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Solubility of gases in water

Solubility of gases in water

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Solutions, colloids, suspensions
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Hardness of water

Hardness of water

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Test for water

Test for water

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Water, an oxide

Water, an oxide

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Degradation of water by reducing agents
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Synthesis of water

Synthesis of water

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Oxidation of metals

Oxidation of metals

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Factors determining the reaction behaviour of metals
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Rusting- "slow combustion"

Rusting- "slow combustion"

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Reduction of copper oxide

Reduction of copper oxide

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Quantitative analysis of oxides

Quantitative analysis of oxides

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The effects of acids on metals

The effects of acids on metals

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Properties of aluminium

Properties of aluminium

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Production of metal alloys

Production of metal alloys

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Reaction of magnesium and calcium with water - hydroxideformation
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Identifying cations with a flame test
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Water quality - contamination with heavy metals
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We examine our drinking water with Cobra4
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Salinity of soils and plant substrates
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Salinity changes of a watercourse
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We visit a wastewater treatment plant
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Mode of operation of an aeration tank (sewage treatmentplant)
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Water treatment in sewage treatment plants
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Oxygen, cause of oxidation

Oxygen, cause of oxidation

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Properties of oxygen

Properties of oxygen

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Reactions in pure oxygen

Reactions in pure oxygen

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Nitrogen, preparation and properties
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Carbon dioxide, preparation and properties
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Soda-lime glass beads

Soda-lime glass beads

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Properties of sulphur

Properties of sulphur

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Binding of nitrogen by base metals
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Graphite and diamond

Graphite and diamond

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General safety precautions to be taken when handling acids
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Hazardousness of concentrated sulphuric acid
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Plant pigments as indicators

Plant pigments as indicators

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The effects of acids on indicators
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The effects of acids and lyes on natural and commercial
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Acid strength

Acid strength

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Preparation and properties of hydrochloric acid
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Preparation and properties of sulphurous acid
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PVC- a potential hydrochloric acid former
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Oxidation of sulphurous acid

Oxidation of sulphurous acid

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Preparation and  properties of sulphuric acid
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Preparation and properties of carbonic acid
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Safety precautions to be taken when handling lyes
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Alkalis - constituents of hous ehold detergents
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Ammonia- comparison of gas and aqueous solutions
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Aqueous solubility of ammonia

Aqueous solubility of ammonia

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Preparation and properties of sodium hydroxide solution
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Alkali formation due to a reaction of metal oxides with wa-ter
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Acids and their effect on indicators
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The effect of acids and bases on natural and synthetic indicators
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Identification of buffers with indicators
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Temperature behaviour of organic compounds
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The decomposition of organic substances
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The detection of carbon by oxidation
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The detection of oxygen

The detection of oxygen

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The detection of nitrogen

The detection of nitrogen

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The detection of sulphur

The detection of sulphur

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The Beilstein test

The Beilstein test

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Titration of a strong acid with a strong base with Cobra4
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Titration of an acidic soft drink with a strong base with Cobra4
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Experimental confirmation: Henderson-Hasselbalch with Cobra4
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Titration of a buffer solution with a strong base with Cobra4
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Titration of a buffer solution with a strong acid with Cobra4
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