Uploaded May 2020 | Updated September 2026, 3 weeks ago
Check out the quickest way to make a rocket with this experiment!
Equipment: test tube with cork, baking soda, citric acid, water, napkin.
Mix some baking soda and citric acid in a napkin. Carefully twist the napkin to encapsulate the mixture and cut off the excess. This will serve as your rocket fuel! Insert the fuel into a test tube with water and cork the tube tightly. Turn the tube upside down and begin the countdown!
When dissolved in water, baking soda and citric acid react with each other to release a large quantity of carbon dioxide. This process causes the pressure inside the closed tube to increase, which forces the cork out and launches the tube like a rocket.
This and other safe home experiments are waiting for you in the MEL Chemistry subscription!
Safety precautions: Warning! Only under adult supervision
Check out the quickest way to make a rocket with this experiment!
Equipment: test tube with cork, baking soda, citric acid, water, napkin.
Mix some baking soda and citric acid in a napkin. Carefully twist the napkin to encapsulate the mixture and cut off the excess. This will serve as your rocket fuel! Insert the fuel into a test tube with water and cork the tube tightly. Turn the tube upside down and begin the countdown!
When dissolved in water, baking soda and citric acid react with each other to release a large quantity of carbon dioxide. This process causes the pressure inside the closed tube to increase, which forces the cork out and launches the tube like a rocket.
This and other safe home experiments are waiting for you in the MEL Chemistry subscription!
Safety precautions: Warning! Only under adult supervision





![Сlean a penny in 60 seconds
Vinegar and salt – and an old copper coin shines like new!
Equipment: plate, bowl, glass, tablespoon, vinegar, table salt, old copper coin.
Dissolve two tablespoons of table salt in a glass of vinegar. Pour the solution into a bowl and immerse an old copper coin in it – it brightens rapidly before your eyes!
Old copper coins are covered with films of a mixture of copper(I) oxide and copper(II) oxide. Such films cannot be dissolved in vinegar or a solution of sodium chloride separately, but they rapidly react with a mixture of vinegar and salt. Copper(II) oxide dissolves in acetic acid, forming copper(II) acetate:
2CH₃COOH + CuO → (CH₃COO)₂Cu + H₂O
And copper(I) oxide reacts with sodium chloride, forming chloride complexes:
Cu₂O + 2NaCl + 2CH₃COOH → 2Na[CuCl₂] + 2CH₃COONa + H₂O
These processes must happen simultaneously, so the coin cannot be cleaned by rinsing first with vinegar, then with a salt solution, or vice versa. Rinse your coin with water after the experiment to ensure that it retains its shine for a long time!
Many more cool experiments await you in the MEL Chemistry subscription!
Warning! Only under adult supervision. Сlean a penny in 60 seconds](https://i.ytimg.com/vi/lRKUnVFFIqk/mqdefault.jpg)




