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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
- Change in color: The appearance of a new color or a change in the intensity of the existing color.
- Formation of a gas: Production of bubbles, fizzing, or the release of a gas.
- Temperature change: Heat or cold is generated or absorbed during the reaction.
- Formation of a precipitate: A solid substance forms in a previously clear solution.
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
- Precipitation forms
- Production of bubbles
- Temperature change
- Color change
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What does this indicate about the reaction that took place in the beaker?
The formation of white precipitate indicates a chemical reaction occurred in the beaker that resulted in the precipitation of a solid product from the solution.
What determine whether a reaction took place?
Whether a reaction took place is determined by the change in chemical composition, the formation of new substances, the release of energy or heat, and the color change or visible evidence of a chemical change. These factors indicate that a chemical reaction has occurred.
Is dissolving salt in water a physical or chemical change?
Dissolving salt in water is a physical change because the salt molecules stay intact and only disperse in the water, without undergoing a chemical reaction.
When CO2 mixes with limewater how do you know a chemical reaction took place?
When CO2 reacts with limewater (calcium hydroxide), the solution turns milky due to the formation of calcium carbonate, which is insoluble and precipitates out. This indicates a chemical reaction has taken place as a new substance with different properties has formed.
What is a product of a reactant?
A product is a substance formed after a chemical reaction from the reactants involved in the process. It is the result of the reaction and can be a single compound or a mixture of compounds that were not present before the reaction took place.
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
How an element produce heat?
A chemical reaction took place creating a new element.
What does this indicate about the reaction that took place in the beaker?
The formation of white precipitate indicates a chemical reaction occurred in the beaker that resulted in the precipitation of a solid product from the solution.
What is the evidence that a chemical reaction took place when zinc mixed with HCl?
Evidence that a chemical reaction took place when zinc mixed with HCl includes the production of hydrogen gas bubbles, formation of zinc chloride as a product, and an increase in temperature of the reaction mixture due to the exothermic nature of the reaction. Additionally, the disappearance of the solid zinc as it undergoes dissolution is another indication that a chemical reaction has occurred.
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.
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 silver nitrate was mixed with ammonium chloride?
The evidence that a chemical reaction took place when silver nitrate was mixed with ammonium chloride is the formation of a white precipitate of silver chloride. This indicates that a chemical reaction occurred between the silver ions from silver nitrate and the chloride ions from ammonium chloride, resulting in the insoluble silver chloride. Additionally, the solution may turn cloudy or there may be a color change, further supporting the occurrence of a chemical reaction.
List two observations from the vinegar lab that imdicates a chemical reaction took place?
Bubbles
What happens when a compound undergoes a chemical reaction?
When a compound undergoes a chemical reaction, its chemical bonds are broken and reformed to result in new substances with different chemical properties. This process can involve changes in energy, formation of new bonds, and rearrangement of atoms. The reactants are transformed into products through the rearrangement of atoms.
What determine whether a reaction took place?
Whether a reaction took place is determined by the change in chemical composition, the formation of new substances, the release of energy or heat, and the color change or visible evidence of a chemical change. These factors indicate that a chemical reaction has occurred.
