Compounds have a fixed, unchangeable ratio. Water is always two hydrogen atoms for every oxygen atom. Always. If you try to add extra hydrogen, you get hydrogen gas and fire—not water.
Compounds vs. Mixtures | Middle School Science Reading Passage
Mixtures laugh in the face of precise recipes. You can have a pinch of salt in your soup or a whole mountain, and it’s still a mixture of soup and salt. The ratio is completely up to your taste buds (or your sodium levels).
This is why baking a cake is actually a chemical reaction (making new compounds), but tossing a salad is a glorious, lawless mixture. You can put raisins in my salad, and I will judge you, but it’s still a mixture.
Fun Fact with a Punchline
Did you know that air is a mixture? Yes, the stuff you breathe is mostly nitrogen (78%), oxygen (21%), and a splash of argon (0.93%). But if air were a compound, you’d only ever breathe one exact blend—no scenic variation. Basically, compounds are the control freaks; mixtures are the free spirits who forget to text you back.
