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
precipitation
evolution of gas
change of odor
change of color
change of viscosity
change of temperature
change of pH
visible formation of a new compound
im sorry bout the language people put on here its glow smoke burn fire
Dissolving salt in water is a physical change- no chemical reaction took place. If the water evaporates, the salt is still there.
The solution becomes cloudy due to the formation of calcium carbonate, a white solid.
lop
chemical reactions took place when labrotary experimentories.
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
caramelization :D
taulom
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.
A chemical reaction took place creating a new element.
Bubbles
changes in its appearance ie colour and state
"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.
1. Initial substances in a chemical reaction are called reactants.2. The obtained final substances are called products or resulting substances.
Dissolving salt in water is a physical change- no chemical reaction took place. If the water evaporates, the salt is still there.
it is an ionic and exothermic reaction i.e. when it will take place heat will be liberated
Yes, and zinc chloride and hydrogen are obtained.
A white precipitate of silver chloride (AgCl) is formed.