Chemistry is a very engaging subject. There are so many astounding facts in chemistry that are worth knowing.

1. Water expands on freezing. The volume of 1 ice cube is 9% more than the liquid used to form it.

2. Mercury and bromine are the only two elements that change from a solid to a liquid at room temperature. However, if you hold a lump of gallium in your hands, it will melt with their warmth.

3. If you take a cup of water and put a few tablespoons of salt in it. The level of water goes down instead of rising and overflowing.

4. Human body contains about 200 g or 0.4 lb of NaCl or salt.

5. When you mix 1/2 L water and 1/2 L alcohol, the combined solution is less than 1 L.

6. Pure elements are found in different forms. For instance, pure carbon occurs in the form of graphite and diamond.

7. Water or H2O is known as dihydrogen monoxide in chemical terms.

8. Several radioactive elements glow when it is dark.

9. J is the only letter that is not present in the periodic table.

10. Copper and gold are the only non-silvery types of metals.

11. Ozone or O3 is produced when lightning strikes. It strengthens the atmosphere’s ozone layer.

12. Oxygen gas has no color. But solid or liquid oxygen appears to be blue.

13. There is plenty of carbon in the human body. The amount is sufficient to provide the “lead” for about 9000 pencils.

14. Hydrofluoric acid, which belongs to the category of weak acids, is so corrosive that it can dissolve glass.

15. Astatine is the rarest element that occurs naturally in the crust of the Earth. Probably, just 28 g of astatine is in existence.

16. The number of buckets of water found in the ocean (Atlantic ocean) is less than the number of atoms found in a bucket of water.

17. The sting of a bee is acidic while that of a wasp has alkaline properties.

18. Helium has less weight than air. That is why helium balloons can float.

19. A molecule named capsaicin is responsible for the heat found in hot peppers. This molecule irritates mammals, but birds do not feel the burning sensation because they do not have the receptor for this effect.

20. When carbon dioxide or CO2 is in solid form, it is known as dry ice.

21. Liquid air is slightly blue, just like water.

22. It is not possible to freeze helium by exposing it to a low temperature. Intense pressure has to be applied to freeze it.

23. A person’s body loses nearly 1% of water by the time they feel thirsty. Consuming an excessive amount of water can cause death.

24. There is a large amount of rust or iron oxide on Mars, so it appears red.

25. According to the Mpemba effect, hot water can freeze more quickly than cold water. What did I miss?