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to tell if a chemical reaction has occurred look for these four things:
1) color change
2) the formation of gas bubbles
3) formation of a precipitate
4) temperature change
Wiki User
∙ 14y ago
oliviareid
oliviareid
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Wiki User
∙ 11y agoprecipitation
evolution of gas
change of odor
change of color
change of viscosity
change of temperature
change of pH
visible formation of a new compound
Wiki User
∙ 12y ago- Precipitation forms
- Production of bubbles
- Temperature change
- Color change
Wiki User
∙ 12y agoim sorry bout the language people put on here its glow smoke burn fire
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Is dissolving salt in water a physical or chemical change?
Dissolving salt in water is a physical change- no chemical reaction took place. If the water evaporates, the salt is still there.
When CO2 mixes with limewater how do you know a chemical reaction took place?
The solution becomes cloudy due to the formation of calcium carbonate, a white solid.
What are the chemical reactions that took place to make hairspray the product?
lop
Who is the dangerous experiments apparatus?
chemical reactions took place when labrotary experimentories.
What are 4 signs that a physical reaction took place?
A change in state. It can always be changed back into its origanal state. (Ex. Melting, boiling, evaporation, freezing) Other ex. melting butter, shredding paper, mowing the grass, or liquid water to ice
What is the chemical reaction that took place in heating a sugar?
caramelization :D
What are the chemical reaction that took place to make Colgate toothpaste the product?
taulom
What happens when a compound undergoes a chemical reaction?
When a compound undergoes a chemical reaction, it is forever altered. It can never go back to the way it was before the reaction took place.
How an element produce heat?
A chemical reaction took place creating a new element.
List two observations from the vinegar lab that imdicates a chemical reaction took place?
Bubbles
What evidence do you have that a chemical reaction took place?
changes in its appearance ie colour and state
Does a chemical reation produce new substances?
"New substances" is a vague description of what happens in a chemical reaction. Simply put though, yes. An example of this would be if you took baking powder and vinegar and mixed them together, the resulting chemical reaction would create Carbon Dioxide. That is a new substance, it wasn't there until the reaction took place.
What are the substances that react in chemical reaction called?
1. Initial substances in a chemical reaction are called reactants.2. The obtained final substances are called products or resulting substances.
Is dissolving salt in water a physical or chemical change?
Dissolving salt in water is a physical change- no chemical reaction took place. If the water evaporates, the salt is still there.
How do you know that a chemical change took place when sodium and clorine join to form table salt?
it is an ionic and exothermic reaction i.e. when it will take place heat will be liberated
What is the evidence that a chemical reaction took place when zinc mixed with HCl?
Yes, and zinc chloride and hydrogen are obtained.
What is the evidence that a chemical reaction took place when silver nitrate was mixed with ammonium chloride?
A white precipitate of silver chloride (AgCl) is formed.
