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Two students wearing safety glasses and lab coats closely observe a reaction
Four photos: a Petri dish of bacteria showing gaps around spots of antibiotics; helium balloons; post-it notes; radioactive iodine with a labelled container
Three test tubes containing a liquid and metal. Moving from left to right the liquid loses its blue colour and the metal becomes furrier with a black substance
Four test tubes containing different liquids: clear and colourless; pink and clear; white and opaque; blue and opaque
A microscale experiment with droplets of a transition metal ion solution reacting with a sodium hydroxide solution. Iron two reacts to create a greenish sediment, for iron three it's orange and copper two is blue
Two rows of test tubes containing liquids of different colours. The top shows a rainbow range from red through to dark purple and the bottom shows a muted range of dark greens and blues