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Some characteristics of a chemical change are:
- change of smell
- change of color
- release of gases
- change of temperature
- formation of a precipitate
- change of the aspect
- change of pH in solutions
- change of viscosity
- flames or explosion
etc.
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∙ 11y ago
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What is a sign that a chemical change has occurred smoke broken pieces change in shape or change in state?
The production of smoke from something burning would be a sign of a chemical change. Broken pieces, change in shape, or change in state are all physical changes.
Is a pellet of sodium is sliced in two a physical change or a chemical change?
Physical, because each slice of pellet is still the same chemically: you have merely divided your one sodium block into two blocks of sodium. If it were chemical, some kind of notable chemical difference would have occurred (you would no longer have sodium, but something else).
What kind of physical evidence might be observed what would indicate that chemical reaction occurred?
Some indicators of a chemical reaction are:- change of color- change of odor- release of a gas- change of the temperature- change of the viscosity- formation of a precipitate- change of general appearance- possible explosion- possible chemiluminescence -formation of new compounds
Is the change of identity a physical or chemical property?
If you mean a change in chemical identity, that would be a chemical change.
If iodine were not available how would you determine whether starch hydrolysis had occurred?
If iodine is not available, determine whether starch hydrolysis has occurred using a refractometer or plot the yeast that forms.
If the mass of all objects before a chemical change is 200kg what would the mass be after the chemical changed occurred?
There will be a gain in mass.....but you can't predict the new change in mass unless you weigh the products after the chemical change occurred.
How would you determine if a chemical change has occurred?
There are a few ways... 1) the identity of the substance changed 2) there was a gas released (fizzing, bubbles, etc.) 3) color change (even though color change is a physical property, it might be caused by a chemical reaction)
How would recognize if a chemical change had occurred?
Normally there is some energy change. Heat and/or light may be given off.
What is a sign that a chemical change has occurred smoke broken pieces change in shape or change in state?
The production of smoke from something burning would be a sign of a chemical change. Broken pieces, change in shape, or change in state are all physical changes.
What would NOT mean that a chemical change has occurred?
When chemical change has occurred, it means that the object has become something that it will be forever until changed again. For example, when you burn paper, it has become something new, a new substance. That paper has become ashes and will never be paper again.
How might a thermometer help you decide if there was any chemical change on mixing iron and charcoal?
For a chemical change to occur, there must be a chemical reaction. A chemical reaction would be either endothermic (uses energy, mostly heat), or exothermic (produces energy, again mostly heat). Any change in temperature of the reactants, as measured by a thermometer, will tell you not only ifa chemical reaction occurred, but also which kind of chemical reaction. No temperature change usually indicates that no reaction has occurred, a decrease in temperature would indicate an endothermic reaction, while an increase in temperature would indicate an exothermic reaction.
Is a pellet of sodium is sliced in two a physical change or a chemical change?
Physical, because each slice of pellet is still the same chemically: you have merely divided your one sodium block into two blocks of sodium. If it were chemical, some kind of notable chemical difference would have occurred (you would no longer have sodium, but something else).
What kind of physical evidence might be observed what would indicate that chemical reaction occurred?
Some indicators of a chemical reaction are:- change of color- change of odor- release of a gas- change of the temperature- change of the viscosity- formation of a precipitate- change of general appearance- possible explosion- possible chemiluminescence -formation of new compounds
Is the change of identity a physical or chemical property?
If you mean a change in chemical identity, that would be a chemical change.
If iodine were not available how would you determine whether starch hydrolysis had occurred?
If iodine is not available, determine whether starch hydrolysis has occurred using a refractometer or plot the yeast that forms.
How would you determine the chemical composition of magnetite?
Fe2O3
What property is one that involves the production of a new substance?
This would be a chemical change. The other type would be a physical change. In a physical change the identity of the material does not change.
