Acids in the kitchen Lesson 15 of the chemistry course of Mova's primary school: 22 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: the lesson at school .
0 Suck a slice of lemon and your whole face screws up. 1 That sharp, sour taste is the taste of an acid: lemons are full of citric acid. 2 Acids are a big family of substances that taste sour and react with many things. 3 Weak acids are all over the kitchen: vinegar on your chips, the tang of yoghurt, the sharpness of oranges, tomatoes and fizzy drinks. 4 Squeeze lemon into warm milk and it suddenly forms lumps: the acid makes the milk's proteins clump together. 5 Cheese-makers use exactly this trick to make soft cheeses like paneer. 6 Strong acids are a different story. 7 Your stomach makes a strong acid to digest food and kill germs, and a car battery holds a strong acid that can burn skin and eyes, which is why batteries carry warning signs and must never be opened. 8 Sour tastes come from acids; lemons contain citric acid, and sour sweets are dusted with acid powder that stings the tongue. 9 Acidic food, like tomato or lemon, makes a sore spot in the mouth sting. 10 Vinegar is water with acetic acid in it, made by bacteria from wine or cider. 11 Most germs cannot grow in acid, so pickles keep for months in vinegar. 12 Fizzy drinks are slightly acidic, because carbon dioxide in water makes a weak acid, and some colas also have phosphoric acid added. 13 Acid softens tooth enamel for a short time, so it is better to wait a while after a fizzy drink before brushing. 15 Heartburn is when some stomach acid comes up into the food pipe. 16 Ants and nettles inject formic acid and other chemicals that irritate the nerves in your skin. 17 Dock leaves on nettle stings help mostly because rubbing and coolness soothe; they are not a strong chemical cure. 18 Acid makes milk proteins clump into lumps; cheese-makers use this to make soft cheese like paneer. 19 Car batteries contain a strong acid that burns skin and eyes, so they must never be opened. 20 Gases from factory and car smoke dissolve in raindrops and make acid rain, which damaged forests and stone buildings; cleaner factories have reduced it a lot. 21 Bacteria in yoghurt turn milk sugar into lactic acid, which makes it thick and tangy. 22 Unripe fruit is more acidic; as fruit ripens, sugar goes up and acid goes down. ← previous Tarnish and how metals changenext → Alkalis and soda, and how they cancel acids↑ back to Chemistry This page in Markdown → https://md.mova.elamur.ai/free/en/corpora/school/chemistry/15-acids-in-the-kitchen/