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Listed under:  Science  >  Matter  >  Properties of matter  >  pH

Bryozoan skeletons in acidic solution

This is a colour photograph of two tubes, each containing bryozoan skeletons in acidic solution. The photograph depicts a scientific experiment investigating the effect of different pH levels on bryozoan skeletons. (Classification - Phylum: Bryozoa)

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Red cabbage pH experiment

It might sound 'un-sciencey', and have a bad smell, but red cabbage is actually very useful for testing the pH of liquids. Added to well-known liquids like lemonade or vinegar, red cabbage juice changes to 'pretty colours'. In this clip, Surfing Scientist Ruben Meerman explains the colour changes and how red cabbage juice ...

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Check the pH before jumping into this wetland!

Can you imagine a wetland so acidic that its pH levels are similar to the acid in a car battery? It's part of a problem that scientists call acid mud. In this clip from 2008, see how it forms and what scientists are doing to better understand this environmental disaster.

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Magic tricks revealed using chemistry

Some magic tricks, such as disappearing ink or candles that won't blow out, can be explained by chemistry. In this clip, three classroom chemistry experiments demonstrate that some familiar magic tricks rely on acid-base chemical reactions, and the properties and behaviour of gases. Watch closely if you've ever wanted to ...

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Dyeing with red cabbage!

Many natural products, such as red cabbage and turmeric, can be used as a natural source of colour to dye fibres. Watch the dyeing demonstration in this clip to see how. Discover the chemistry of natural dyes, including the bonding properties of different pigments and how acid-base reactions can alter the colour of pH-sensitive ...

Interactive resource

pH: what is pH?

Test solutions to find whether they are acidic, basic or neutral. Arrange them in order of acidity. Measure the pH of solutions using universal indicators and a pH meter. Identify mystery liquids by measuring their pH. For example, identify the liquid in a car battery as an acid. Remember, all acids and bases including ...

Interactive resource

pH: noughts and crosses

Use your knowledge of the pH of different substances to play noughts and crosses against another player. Pick a square, then match the pH that appears to the correct substance to claim that square. Use clues on the container labels to make your choice. For example, if ‘pH 2’ appears in the square, selecting vinegar from ...



This collection of 24 digital curriculum resources is organised into categories of insects, arachnids, centipedes and crustaceans, with descriptions of their sometimes bizarre body features and behaviours in a category titled body structure and adaptations. Colour photographs, scientific illustrations and close-up microscope ...


Poisonous animals

This collection of 17 digital curriculum resources contains a diverse array of poisonous animals that have been organised into four categories – arachnids, marine invertebrates, vertebrates and insects. Some animals in the collection are highly toxic to humans and others are poisonous only to their potential predators. ...


Animal weapons: Australian death adder

This is a colour clip showing how an Australian death adder, a short robust snake, uses a combination of camouflage and a lure to ambush its prey. Camouflaged among leaf litter, the death adder remains motionless apart from the movement of its worm-like tail tip. Eventually a lizard comes close to investigate and with a ...


Animal weapons: geography cone shell

This is a colour clip showing how the geography cone ('Conus geographus'), a colourfully patterned, coiled marine shell concealing a fleshy body inside, captures its prey. While it remains motionless on the sandy floor of the coral reef floor by day, at night it becomes an active hunter searching for suitably sized fish ...


Animal weapons: red-bellied black snake

This is a colour clip showing the red-bellied black snake ('Pseudechis porphyriacus'), a venomous Australian snake. Two males are shown competing to establish sexual dominance. Males of similar size will challenge each other until one submits. The clip is 1 minute 23 seconds in length. (Classification - Phylum: Chordata; ...


Stonefish on rocks, 1946

This is a black-and-white photograph, taken in 1946, showing an estuary stonefish against an encrusted rocky background demonstrating its camouflage.


Platypus walking on grass, 1971

This is a colour photograph taken in 1971 of a platypus walking up a grassy hill, perhaps on the bank of a stream.


Blue-ringed octopus, 1973

This is a black-and-white photograph taken in 1973 of a blue-ringed octopus lying on a white surface with its tentacles and suckers clearly visible.


Box jellyfish (sea wasp, indringa), 1975

This is a colour photograph taken in 1975 of a box jellyfish, also known as a sea wasp, fire medusa, indringa or jellyblubber. Its body and tentacles are clearly visible against a black background.


Camouflaged pheasant coucal chicks, 1968

This is a black-and-white photograph of three chicks in their nest, titled 'Three hairy chicks of the Pheasant Coucal (Centropus phasianinus) lying in a nest amongst long grass, 1968'. The tiny chicks are camouflaged by the surrounding leaves and vegetation that have been used to build the nest.


Stinger of the honey bee

This is a close-up colour photograph of the abdomen of the honey bee ('Apis mellifera') showing the stinger. (Classification - Phylum: Arthropoda, Class: Hexapoda, Order: Hymenoptera, Family: Apidae.)


Goliath stick insect hanging from foliage

This is a colour photograph of a goliath stick insect ('Eurycnema goliath') hanging from foliage. (Classification - Phylum: Arthropoda, Class: Hexapoda, Order: Phasmatodea, Family: Phasmatidae.)


Head of a female goliath stick insect

This is a close-up colour photograph of the head of a female goliath stick insect ('Eurycnema goliath') revealing details such as eyes, antennae and markings. (Classification - Phylum: Arthropoda, Class: Hexapoda, Order: Phasmatodea, Family: Phasmatidae.)