i dont know
Adding food coloring to water isn't a physical or chemical change, food coloring is already an aqueous solution. It is simply diluting the existing solution. If dilution is a physical change, then it is physical.
Boiling water is a physical change because it is simply a phase change, there is no change in the chemical composition.
Physical change – change in form, appearance, state (solid, liquid, gas), etc. — Does not change the chemical composition.
Chemical change – Does change the chemical composition.
By boiling the water it begins to steam off and thats only a physical change plus the rolling/bubbling action of the water. water is still water no mater what its physical form is. I'm not sure about food coloring. It might be chemical because you add something different to the water an therefore its no longer just water. its water plus the funky coloring stuff. I would call that both physical and chemical.
I'm not a pro, so don't bet your grades on me. I've been out of school for 10 years;) good luck
Food Coloring Chemistry
They are both physical changes.
A chemical change requires that the interacting molecules are actually modified. Note that chemical changes usually cause a change in heat because of the energy released (or absorbed) by the change in molecular structure.
Food coloring example: the colored substance is just being dissolved in the water. The molecules stay the same.
Boiling example: The molecule is still water whether as solid, liquid, or gas.
Chemical change example: When brewing beer or wine, yeast turns sugar into ethanol and water. The molecule is modified and therefore this is a chemical change.
Both are physical changes. When you add food coloring it creates a mixture and boiling water only changes H2O from liquid to a gas. In both of these no new substances form as a result. When you burn paper you get ash, or when metal oxidizes rust is produced. These examples are chemical changes.
Adding food color is a physical change, so is boiling water. Remember that you're not changing any chemical structure, and you're not forming or getting rid of a compound.
Boiling and coloring water are both physical changes. To change a substance chemically would be to change it on a molecular level (such as adding or removing electrons)
both are physical.
it's not changing the actual substances; by adding food coloring, you still have H2O. the formula for the compound hasn't changed, and you can separate the food coloring from the water. They aren't bonded together.
As for boiling water, that's just changing the state of the water. If you cool the water down, it'll change back to a liquid.
So, is any mixture a physical change? Is a salad a physical change? It seems to me that neither mixing water and food coloring nor a salad is a physical change.
It's a physical change.
In this case, you're just mixing the two substances together.
One way of telling if a chemical reaction has taken place is if there is a colour change. You see this in chemical indicators such as (the wonderfully named) phenolphthalein, which turns from colourless like water to a bright fuchsia.
However, when you mix food colouring and water, the overall colour changes – but you're really just diluting the colour of the dye. I hope that makes sense.
About the water. That is also a physical change. You are simply adding heat. It's also a tricky one seeing as another way to tell if a chemical reaction has happened is if you see "effervescence" – fizzing or bubbling. When water boils, it bubbles – which may look like a chemical reaction.
This is not the case. The bubbles just contain water in its gaseous form. The water at the bottom is changing from liquid to solid form, and has to escape to the surface.
So to recap, neither are chemical reactions. I hope you have no more trouble with this subject.