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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 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.
A substance that undergoes a chemical change is still the same substance after the change?
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When we place aluminium foil into liquid bromine and find a white solid is that chemical or physical property?
That would be a chemical property, specifically a chemical reaction. The formation of a white solid (aluminum bromide) indicates a chemical change has occurred as the aluminum has reacted with the bromine to form a new substance.
What are 4 indicators that a chemical reactions has occurred?
A chemist would look for a : change in color, smell, temperature, and release of gas todetermine if a chemical reaction had occurred. Ion: An atom or a group of atoms that has acquired a net electric charge by gaining or losing one or more electrons. Ionic: Of, containing, or involving ions. Molecule: The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more atoms; a group of like or different atoms held together by chemical forces. Molecular: Of, relating to, or consisting of molecules. Of or relating to simple or basic structure or form.
How would you determine if a chemical change had occurred?
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.
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 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.
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.
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.
A substance that undergoes a chemical change is still the same substance after the change?
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How do you know when a chemical reaction happend?
You can tell a chemical reaction has occurred if there is a change in color, formation of a gas or solid precipitate, evolution of heat or light, or a change in odor. Additionally, changes in the chemical composition, such as the breaking or forming of bonds between atoms, indicate a chemical reaction has taken place.
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).
Is the change of identity a physical or chemical property?
If you mean a change in chemical identity, that would be a chemical change.
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
When we place aluminium foil into liquid bromine and find a white solid is that chemical or physical property?
That would be a chemical property, specifically a chemical reaction. The formation of a white solid (aluminum bromide) indicates a chemical change has occurred as the aluminum has reacted with the bromine to form a new substance.
