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Lao- 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.
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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.
