Are separations of mixtures physical or chemical changes?

Answer 1

Physical. Salt water is a mixture, and you can separate it into NaCl and H2O simply by evaporating the water. As long as it does not change the chemical composition of the molecules, it is a physical change.

Answer 2

Separations of mixtures would be a physical change because you are not changing the chemical make-up of the mixture. Instead, you are simply sorting parts of the mixture. For example, taking out all of the blue blocks in a bag full of red, yellow, green, and blue blocks would be an example of a physical change and separating a mixture.

Answer 3

Physical changes are changes that involve boiling, freezing, or dissolving. Chemical changes are changes in which a new substance is formed.

When you want to separate substances, you want them to remain the same (as in the same chemical formula). A chemical change would change the to substances, which you don't want. So you would use a physical change because it won't create new substances, but leave you with two separated substances

For example, if you want to separate the salt from the water in salt water, you would boil the water until it all evaporated as steam (leaving all the salt behind). This separation was caused by boiling (characteristic of physical change) the water.

Answer 4

A chemical change is were you cant get the previous material back such as cooking potatoes. A physical change, such as melting a candle, can be easily returned to it's previous state.

Answer 5

Separating methods are physical procedures.

Answer 6

physical change