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It's a physical change. The various constituents of flour are all organic compounds, and water is usually a neutral medium with organic compounds (the only exceptions I know of are the various organic acids like acetic acid (vinegar)).
However, if you ask this because you want to use flour that got soaked, I don't really recommend it. Flour is a very good source of carbohydrates, which lots of things can very easily digest. Wet flour has basically everything necessary for a lot of simple life forms, so it has a decent chance of mouldering or getting infested with insects.
In general, chemical reactions are accompanied by one or more of:
Temperature change
Generation of light (though most of the reactions that do this are rather dangerous, like sodium and water, or TNT, or combustion (burning)
Generation of bubbles (though this is also caused by heating things to boiling)
Formation of a precipitate (seemingly clear water suddenly has small particles (like table salt) floating in it when something is added)
Color change (like rust - iron to iron oxide... and steel is just iron with a bit of carbon in it)
Source: answers.com question on indicators in chemical reactions.
I'd also like to add rapid changes of physical state (solid-liquid-gas-aqueous, the latter of which is when you have something dissolved in water to the point where it can't be removed) to that list, though it's hard to see in lots of cases. Being a student in a hydrometallurgy class, I'd be remiss not to add the key indicator of importance in hydrometallurgy.
What else can I help you with?
Flour and milk mixed a chemical or physical change and why?
Mixing flour and milk creates a physical change because no new substances are formed. The flour and milk retain their individual chemical properties, and the mixture can be easily separated by physical means such as straining.
Is mixing flour and salt a physical or chemical change?
physical
Could Making dough from flour be an example of a physical or chemical change?
Hey there, I am in grade eight, and out class is learning about that stuff too. I think that making dough from flour is a chemical and a physical change. But I will ask my teacher tomorrow and re-answer this question tomorrow or something
Two chemical are mixed together and a gas is produce is it chemical or physical?
The production of a gas when two chemicals are mixed is a chemical change. This is because it involves a reorganization of the atoms in the reactants to form new compounds, resulting in a change in chemical composition.
Is adding antifreeze to your radiator a chemical or physical change?
Adding antifreeze to your radiator is a physical change because the antifreeze retains its chemical composition and properties when mixed with the water in the radiator. It does not undergo a chemical reaction to form a new substance.
Flour and milk mixed a chemical or physical change and why?
Mixing flour and milk creates a physical change because no new substances are formed. The flour and milk retain their individual chemical properties, and the mixture can be easily separated by physical means such as straining.
Is mixing flour and salt a physical or chemical change?
physical
Could Making dough from flour be an example of a physical or chemical change?
Hey there, I am in grade eight, and out class is learning about that stuff too. I think that making dough from flour is a chemical and a physical change. But I will ask my teacher tomorrow and re-answer this question tomorrow or something
Is baking soda mixed with iodine a chemical or physical change?
Chemical Change
Is sand and water mixed a chemical and physical change?
Chemical
Is soap being mixed with water a chemical or physical change?
physical
Is sand and dirt mixed a chemical or physical characteristics?
it is a physical change
Is baking powder mixed with iodine chemical or physical change?
This is a physical process.
Is vinegar and salt mixed a chemical or physical change?
This is a physical change because any reaction occur.
Two chemical are mixed together and a gas is produce is it chemical or physical?
The production of a gas when two chemicals are mixed is a chemical change. This is because it involves a reorganization of the atoms in the reactants to form new compounds, resulting in a change in chemical composition.
Is mixed thousand island dressing and mayonnaise a physical or chemical change?
Mixing is a physical process.
When baking soda is mixed with lemon juice bubbles are formed with the evolution of gas Is it a physical or chemical change?
it is a chemical change
