In a pure substance It has a set ratio, like for every 2 blue there is one red. In a mixture there is no set ratio it is lots of different atoms.

Answer 1

Your explanation captures an important distinction between pure substances and mixtures.

1. Pure Substances: A pure substance has a consistent and defined composition, which means that its chemical composition does not change regardless of its source. In your example, a pure substance with a ratio of 2 blue to 1 red would refer to a compound with a fixed chemical formula, such as those found in chemical compounds (e.g., water with the formula H₂O, where there is a specific ratio of hydrogen to oxygen).

2. Mixtures: A mixture, on the other hand, consists of two or more substances that are physically combined but retain their individual properties and identities. There is no fixed ratio in mixtures; for example, you can have varying amounts of different components (e.g., a mixture of sand and salt can contain any proportion of both). The components can be separated by physical means, and they do not undergo a chemical change when mixed.

In summary, pure substances have a uniform composition with definite ratios, while mixtures allow for a variable composition without fixed proportions.