Checkpoint: groups, strips and neutralisation
Five questions on the first six ideas. You get feedback right away. Retry it any time you like.
Lemon juice, tamarind water and vinegar all taste sour. What do they share?
Red litmus stays red in a liquid. Which group is ruled out?
Blue litmus and red litmus both stay as they were. What is the liquid?
Vinegar and soap solution are mixed. Neither litmus changes colour. What happened?
What does an acid make when it cancels a base?
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