Law of definite proportions
The law of definite proportions says that all compounds will always have the same proportions of their constituent elements by mass.
Think of it like baking a cake! A recipe that calls for a cup of flour and half a cup of sugar will always make the exact same cake, no matter who follows the recipe. Just like how a compound made up of, say, hydrogen and oxygen will always have the same ratio of hydrogen to oxygen, no matter where or when it is produced.
So, whenever we’re dealing with chemical compounds, we always know that the elements within them will be in the same ratio, every time. It’s like how every person has the same number of fingers and toes - it’s set in stone, and will always be the same way!
Think of it like baking a cake! A recipe that calls for a cup of flour and half a cup of sugar will always make the exact same cake, no matter who follows the recipe. Just like how a compound made up of, say, hydrogen and oxygen will always have the same ratio of hydrogen to oxygen, no matter where or when it is produced.
So, whenever we’re dealing with chemical compounds, we always know that the elements within them will be in the same ratio, every time. It’s like how every person has the same number of fingers and toes - it’s set in stone, and will always be the same way!