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Very complex chemical changes cause the yellowing of leaves. Primarily, the green chlorophyll breaks down leaving some of the yellow colours which were hidden, e.g. xanthophyll. Other chemical changes produce new coloured substances such as red anthocyanins.
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Is it a physical or chemical change when bleach turns hair yellow?
chemical
When paper turns yellow brown upon exposure to sunlight what type of change has taken place a chemical or physical change?
Physical, Because The Color Changes.. Not The Chemical Property Of The Paper.. :)
When paper turns yellow after a few weeks is it a chemical change or a physical?
Physical (I'm pretty sure). If there is no change in the formula/chemical makeup/etc. then the change is purely physical. If the newspaper ceased to be a newspaper and became something else, then it would be chemical.
When two clear and colorless aqueous salt solutionsare mixed together the solution turns cloudy and yellow Does this represent a chemical or a physical change?
This would be a chemical change.
Is a yellow solid physical or chemical property of sulfur?
chemical
Is it a physical or chemical change when bleach turns hair yellow?
chemical
Is a leaf changing colors a chemical or physical change?
Leaves change colour because the green pigment (chlorophyll) is degraded, then other pigments like anthocyanins (red or purple) and carotenoids (yellow) are exposed. So the change is more chemical than physical. Leaves going brown are also caused by chemical changes, but it also means the leaf cells are dead or dying.
When paper turns yellow brown upon exposure to sunlight what type of change has taken place a chemical or physical change?
Physical, Because The Color Changes.. Not The Chemical Property Of The Paper.. :)
Is a salt forming a chemical change or physical change?
It is a chemical change because the sodium(Na) is a liquid that forms with a yellow gas, chlorine(Cl), which changes the physical state to a dickmuncher solid, but ultimately they reacted with each other chemically to form salt (NaCl). It does change the physical state, but it is more of a chemical reaction.
When paper turns yellow after a few weeks is it a chemical change or a physical?
Physical (I'm pretty sure). If there is no change in the formula/chemical makeup/etc. then the change is purely physical. If the newspaper ceased to be a newspaper and became something else, then it would be chemical.
Why Heating zinc oxide is a physical change Why?
It is a physical change. I goes from white, to yellow, back to white.
When two clear and colorless aqueous salt solutionsare mixed together the solution turns cloudy and yellow Does this represent a chemical or a physical change?
This would be a chemical change.
Is salt forming a physical chance or chemical change?
It is a chemical change because the sodium(Na) is a liquid that forms with a yellow gas, chlorine(Cl), which changes the physical state to a dickmuncher solid, but ultimately they reacted with each other chemically to form salt (NaCl). It does change the physical state, but it is more of a chemical reaction.
Is a yellow solid physical or chemical property of sulfur?
chemical
Is green leaves turn to yellow a chemical change?
too much water Lack of nitrogen in the soil
Is leaves turning color in the fall a chemical or physical change?
I don't know the scientific equation, but I do know that the tree withdraws it's sugars from the leaves, during the autumn and winter to make sure that there is enough for the main tree. The withdrawal of the sugars is a physical action, but it is a chemical one as well. The chlorophyll that was made thru the sunlight on the leaves for photosynthesis. This stops when the weather turns colder and there is less sunlight causing the leaves lessen the amount to chlorophyll they can make, signaling to the tree to cut off the sugar supply to the leaves. I'd say it's both. Also, You have witnessed a spectacular chemical change if you have seen the leaves on a tree change from green to bright yellow, red, or orange. But, it is not a change from a green pigment to a red pigment, as you might think. Pigments are chemicals that give leaves their color. In autumn, however, changes in temperature and rainfall amounts cause trees to stop producing chlorophyll. The chlorophyll already in the leaves undergoes a chemical change into colorless chemicals.Where do the bright fall colors come from? The pigments that produce fall colors have been present in the leaves all along. However, in the summer, chlorophyll is present in large enough amounts to mask these pigments. In the fall, when chlorophyll production stops, the bright pigments become visible.
How can you tell the difference between Physical change and chemical change?
A there are physical changes but, if you know the 4 chemical changes, anything else is a physical change.OxidationBurningHeat changeBubbling (not boiling)
