Product (Chemistry)


 

A mini nursery

 

Merely dirty

 

Night and day

 

Weather observation with the Cobra4 Mobile-Link

 

Mirror your tongue

 

Teamwork

 

A matter of taste

 

Very close

 

Feeling fine

 

Hot or cold

 

Sound waves

 

Music

 

Orientation

 

A look at your eye

 

Near and far

 

The upside down candle

 

Thermal convection in water

 

Blind spot

 

Two eyes see more than one

 

A useful trick

 

Temperature sensitivity of the skin

 

Spreading of smells

 

Tactile sensitivity

 

Tactile sensitivity

 

Vibrations in the air

 

Lens shapes

 

A look at shapes and colours

 

Measurement of respiratory volume

 

Calibration of a thermometer

 

Temperature measurement

 

Temperature of mixture

 

Wool as thermal insulator

 

Air (feathers) as thermal insulator

 

Thermal insulation

 

Heat of evaporation of water

 

Heat of evaporation of spirit

 

Lowering of the melting point with salt

 

Ice floats

 

One magnet, five metals

 

The divided magnet

 

Absorption of thermal radiation (light)

 

Thermal convection in water

 

Thermal conduction in glass and metal

 

Thermal conduction in water

 

Production of gypsum plaster

 

Processing of gypsum

 

Bimetallic principle

 

Properties of Matter,hardness, colour,magnetisability,water, solubility

 

Hardness of water

 

Comparison of a physical process and a chemical reaction

 

Mixture separation - chromatography

 

Mixture separations - filtration, magnatic separation

 

Mixture separations - filtration, magnatic separation

 

Properties of mixtures

 

Properties of matter - density determination

 

Properties of matter - boiling point

 

Properties of Matter,hardness, colour,magnetisability,water, solubility

 

Plaster moulds

 

The sinking of a paper clip

 

The soap boat

 

We study a flower

 

Calibration of a force measuring instrument

 

The two-sided lever

 

Save energy, use pulleys

 

Soil aeration

 

A quick run trough

 

Underfoot forces

 

The magic wand

 

A balloon in a flask

 

The postcard trick

 

Hot and cold air

 

Fresh and spent air

 

The thirsty candle

 

Water and ice

 

Sweet and salty solutions

 

An egg in water

 

A refrigerator in a bottle

 

Colder than ice

 

Soft and hard water

 

Soap suds

 

Water and oil - separate and together

 

A wall of water

 

A drop of water

 

Clean water

 

Thermal expansion of air and water

 

Thermal expansion of water and methylated spirit

 

States of aggregation of water

 

River bank filtration

 

Ice floats ? Maximum density of water is 4 °C

 

Water content of natural substances

 

Dissolved components in different waters

 

Solutions, colloids, suspensions

 

Hardness of water

 

Test for water

 

Is air nothing?

 

Air pollution

 

Examination of soil horizons

 

Properties of mixtures

 

Liquid mixtures

 

Mixture separation - evaporation

 

Mixture separations - filtration, magnatic separation

 

Mixture separation - extraction

 

Mixture separation - chromatography

 

Separation of a mixture of liquids by distillation

 

Burning iron

 

Short-circuit

 

Properties of matter - boiling point

 

Properties of matter - sublimation

 

Volume contraction of liquids

 

Dissolution processes on liquids

 

Dissolution of salts

 

Crystallisation

 

Melting-point lowering and boiling-point elevation

 

Light and shadows

 

Silhouettes

 

Mirror images of the shadow

 

Playing wih mirrors

 

Playing with a spoon

 

The lost coin

 

A lens made of water

 

The book of mirrors

 

The bent mirror

 

The look into infinity

 

The labyrinth of light

 

The rainbow CD

 

What a lens can do

 

Comparison of a physical process and a chemical reaction

 

Reaction of copper and sulphur

 

Chemical process: synthesis and analysis

 

Chemical process: synthesis and analysis

 

The law of conservation of mass in chemical reactions

 

The law of definite proportions in chemical reactions

 

Chromoplasts

 

Brine shrimp (Artemia salina)

 

Properties of Matter,hardness, colour,magnetisability,water, solubility

 

Properties of material - combustibility, melting point

 

Properties of matter - density determination

 

Test of oxygen

 

Test for hydrogen

 

Test for nitrogen

 

Salt formation by precipitation reaction - qualitative determination of chlorids and sulphates

 

Properties of lithium, sodium and potassium

 

The importance of air for combustion processes

 

Air, a mixture of substances

 

Structure and mode of operation of a Bunsen burner

 

The candle flame

 

Air- a mixture of the gases oxygen and nitrogen

 

The sense of smell

 

The combination of the senses of the taste and smell

 

The sense of taste

 

The blind spot

 

Optical illusions

 

Test confirming the migration of ions by means of indicatorpaper

 

Periodic system properties of a group of elements - Group 2

 

Dipole properties

 

Behaviour of salts with regard to solvents of differentpolarities

 

Osmosis - dependence of the osmotic pressure on the concentration

 

Solubility of gases in water

 

Solubility of salts in water - comparison with the solubili-ty of gases in water

 

Water, an oxide

 

Degradation of water by reducing agents

 

Synthesis of water

 

Oxidation of metals

 

Factors determining the reaction behaviour of metals

 

Rusting- "slow combustion"

 

Reduction of copper oxide

 

Quantitative analysis of oxides

 

The effects of acids on metals

 

Salt formation from chemical elementsreaction of zinc and iron with sulphur and iodine

 

Properties of aluminium

 

Production of metal alloys

 

Reaction of magnesium and calcium with water - hydroxideformation

 

Water quality - contamination with heavy metals

 

We examine our drinking water with Cobra4

 

Acidity changes of a watercourse

 

Comparison of soil and air temperatures in the course of a day with Cobra4

 

The pH value of various soils

 

Salinity of soils and plant substrates

 

Salinity changes of a watercourse

 

We visit a wastewater treatment plant

 

Mode of operation of an aeration tank (sewage treatmentplant)

 

Water treatment in sewage treatment plants

 

Model experiment on the desulphurisation of flue gas

 

Oxygen, cause of oxidation

 

Properties of oxygen

 

Reactions in pure oxygen

 

Nitrogen, preparation and properties

 

Carbon dioxide, preparation and properties

 

Soda-lime glass beads

 

Properties of sulphur

 

Binding of nitrogen by base metals

 

Graphite and diamond

 

Structure and strength of bones

 

Body heat

 

Starch containing nutrients

 

Sugar containing nutrients

 

Fat containing nutrients

 

Digestible and indigestible fats

 

General safety precautions to be taken when handling acids

 

Hazardousness of concentrated sulphuric acid

 

Plant pigments as indicators

 

The effects of acids on indicators

 

The effects of acids and lyes on natural and commercialindicators

 

Acid strength

 

Preparation and properties of hydrochloric acid

 

Preparation and properties of sulphurous acid

 

PVC- a potential hydrochloric acid former

 

Sulphurous acid- environmental hazards due to the combustionof fossil fuels, acid rain

 

Oxidation of sulphurous acid

 

Preparation and properties of sulphuric acid

 

Preparation and properties of carbonic acid

 

Brönsted acids: conductivity comparison of molten and dis-solved oxalic acid

 

Brönsted acids: acidity comparison of an aqueous and an ace-tonic solution of citric acid

 

Safety precautions to be taken when handling lyes

 

Alkalis - constituents of household detergents

 

Ammonia- comparison of gas and aqueous solutions

 

Aqueous solubility of ammonia

 

Preparation and properties of a lime water/magnesium hydro-xide solution

 

Preparation and properties of sodium hydroxide solution

 

Alkali formation due to a reaction of base metals with water - qualitative determination of the conductivity of solution

 

Alkali formation due to a reaction of metal oxides with wa-ter

 

Reaction of alkalis with aluminium - alkali strength

 

Acid-base theory according to Brönsted I: reactions withhydrogen chloride

 

Acid-base theory according to Brönsted II: water as anampholyte

 

Determination of pH values and calibration of pH-electrodes Basic principles of pH measurement

 

Acids and their effect on indicators

 

The effect of acids and bases on natural and synthetic indicators

 

Identification of buffers with indicators

 

Qualitative detection of elements

 

Temperature behaviour of organic compounds