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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)

Moving Image

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 ...

Moving Image

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 ...

Moving Image

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 ...


Acidity in the soil

This short unit of three lessons explores soil pH and introduces the pH scale as an international standard. The first two lessons explore the concepts of acidity and alkalinity in foods and in soil. Students research plants that prefer acidic or alkaline soil conditions. A reference sheet for the teacher explains the pH ...

Interactive Resource

Everyday Neutralisation Reactions

Students use this resource consisting of nine slides with diagrams, written explanation and voice-over to understand everyday neutralisation reactions. There is a two-question quiz and a summary slide.

Interactive Resource

pH scale

Students use this resource consisting of eight slides with diagrams, written explanation and voice-over to understand that pH is a measure of the strength of an acid or alkali and how to interpret the colours of universal indicator solution. There is a two-question quiz and a summary slide.

Interactive Resource

Macrobiotica – science @ the lakes

In this resource students work as scientists while exploring their local environment in the real world of scientific endeavour. Games and animations are used to model the real experience of investigating a freshwater lake. This version of the Macrobiotica resource has been modified for Internet use by removing Teaching ...

Interactive Resource

Digestion Part 3 (sk- Intel)

This brief resource consists of 4 sets of illustrated slides with voice over presenting information about the properties of enzymes and their role during digestion.

Teacher resource

Carbon Cycle Sustainability

People rely on plants to survive, and plants are affected by people. This unit shows some of the relationships that make up earth's ecosystem. This inquiry-based sequence of six lessons is based on current food security, sustainability and photosynthesis research. The experiments and activities include easy to set and see ...

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.