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Why is only one sign of a chemical change not enough to guarantee a chemical change has occurred?
To avoid a confusion with other processes.
Signs of chemical reactions may be:
- Gas release
- Formation of a precipitate
- Change of color
- Change of odor
- Change of pH
- Change of aspect
- Change of viscosity
- Change of the temperature
- Visible formation of new compounds
What else can I help you with?
Is making Sugar into sugar syrup a physical change or chemical change?
Unless you overdo it and carmelize it, it is a physical change. A typical process is to dissolve a large amount of sugar into hot water (physical change - the sugar is still sugar and the water is still water; they do not react. If the sugar-water is not syrupy enough, you can boil off some of the water (still a physical change). If you overdo it though, you will begin to caramelize the sugar. If the sugar is sucrose, it breaks down into fructose and sucrose along with a host of other side reactions that condense, isomerize, dehydrate, fragment, polymerize, and otherwise chemically change the original sugar. Caramelization is definitely a chemical change, but it is not necessary to make syrup.
Is glass melting a chemical change?
I believe melting most items is a physical change as you are only changing the state of the matter, not it's composition. There may however be a breakdown that occurs depending on the composition of the glass with high enough temperatures. This would change the chemical composition. I believe you can relate it to melting plastic (don't actually do this as it releases toxic gases). At low enough temperatures it just becomes soft and moldable. At higher temperatures you burn it down and cause changes in the material. I'm no expert
Is mixing milk and chocolate syrup a chemical change?
A chemical change involves a change in a substance's chemical make-up or conversion to a different substance. A physical change is one that involves changes in a substance's physical makeup that is not brought about by a chemical change, such as sugar dissolving in water. Therefore, mixing milk and chocolate syrup is not a chemical change. Now, if for some reason the syrup had a strong enough acid in it, and mixing the two made the milk curdle or solidify, then yes, it would be a chemical change.
Is a grilled hamburger a physical or chemical change?
its chemical change.because a certain reaction is made.when u grill it.
Would it be a chemical change if Blueberry juice is squeezed over a white shirt to dye it blue is this a chemical change or physical change?
The shirt is white because something is making it white and that something could have reacted with the blueberry juice. It depends on the juice and the material the shirt is made of. If the Juice can be squeezed out or removed with enough rinsing or washing, it may be just a physical change. Otherwise, the dye in the juice may have chemically bonded with something in the shirt material and may need a chemical substance such as a bleaching agent to neutralize it.
What is the change in matter that produces one or more new substances?
Change in the nucleus of an elemental atom will change or break the atom. Change in the number of electrons in an atom will change its charge. Change in the number of the electrons in a molecule will change its charge and possibly will change its shape, or may break it. New chemicals can be made through combinations of other chemicals. Shooting photons at an atom or a molecule can change something about the atom or molecule, if the photon has the right energy and 'hits' it properly. It is also possible, under appropriate conditions, that a photon of high enough energy shot by an atom will convert into an electron (matter) and a positron (antimatter).
Is spray painting a car a physical change or chemical change?
Both, strangely enough. Applying the paint to the car is a physical change. The paint is a polyurethane compound. When you get it, it's in at least two containers - the paint, and a hardener. Stir them together and they undergo a chemical change.
Is a leaf turning brown a physical or chemical change?
Photosynthesis makes a leaf green so when it turns brown it has stopped doing photosynthesis so most likely it is chemical change. Helpful enough? :|
Is steam a chemical raection?
No. Steam is water vapor. Steam is formed by boiling water, which is a physical change.
Is boiling a chemical change or psychical change?
Boiling is a physical change because it involves a change in the state of matter from liquid to gas without altering the chemical composition of the substance. The molecules in the liquid gain enough energy to overcome intermolecular forces and escape into the gas phase.
Is hammering gold until it becomes flat a physical change or chemical change?
Pounding a gold coin into a different shape would probably not effect a chemical change. If, however, the pounding produced enough heat to meal the coin, some chemical change could take place.
When you boil something what happens?
A chemical change occurs when you boil something. Also, evaporation can occur when it gets hot enough.
Is making Sugar into sugar syrup a physical change or chemical change?
Unless you overdo it and carmelize it, it is a physical change. A typical process is to dissolve a large amount of sugar into hot water (physical change - the sugar is still sugar and the water is still water; they do not react. If the sugar-water is not syrupy enough, you can boil off some of the water (still a physical change). If you overdo it though, you will begin to caramelize the sugar. If the sugar is sucrose, it breaks down into fructose and sucrose along with a host of other side reactions that condense, isomerize, dehydrate, fragment, polymerize, and otherwise chemically change the original sugar. Caramelization is definitely a chemical change, but it is not necessary to make syrup.
Is lithium metal light enough to float on water a physical change?
Your question makes no sense. If stripped down, your question looks like this: "Is metal change?" The answer to this question is obviously "no, but some change is metal, such as pennies or nickels"
Is a rusty nail reversible?
Surface rusting may be removed without weakening the metal nail too much. A badly rusted nail may not have enough metal left to be strong enough to still be useful. Therefore, irreversible change depends on the depth the rusting has reached.
What is a physical change that takes place when oxygen and hydrogen are combined to form H2O?
When oxygen and hydrogen combine to form water there is a chemical change, not a physical change. That may be followed by a physical change, depending on the conditions when the chemical change occurs. You may, for example begin with water vapor and, if the temperature is low enough, it will condense (a physical change) to liquid water.
What is age of see horror movie haunted in theatre?
You are not old enough. I guarantee it.
