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Is dissolving salt in water a a chemical change or a physical change?
It is a physical change as it can be "undone" by evaporating the water. An simple example of a chemical change is baking a cake, you can't un-bake a cake. To work out whether it is a chemical or physical change just think whether it can be undone or not.
Can a physical change be undone why or why not?
Yes, a physical change can be undone because it does not involve a change in the chemical composition of the substance. Reversing physical changes typically involves applying an opposite force or condition to restore the original state of the matter, such as melting and freezing or evaporating and condensing.
Is frezzing water a chemical change or physical change?
Freezing water is a physical change. It can be undone. In all situations, ask yourself if the substance can be undone. If the substance can be undone then it is undergoing a physical change. Freezing the water is only changing its phase, therefore it is only experiencing a physical change.
What is another name for a permanent change in science?
A permanent change in science can also be referred to as a paradigm shift, where there is a fundamental change in the way scientific theories and practices are understood and applied.
When the bread is cooked it turns to toast this change is not reversible describe a different non reversible change?
That is a chemical change. Physical changes can be undone. Burning a bit of paper is another non-reversible change.
