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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.
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.
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.
What evidence indicates that a chemical change took place when the iron and sulfur combined to from iron sulfur?
Evidence of a chemical change occurring when iron and sulfur combine to form iron sulfide includes the observation of color change from gray/brownish to black, the release of heat energy as the reaction occurs, and the formation of a new substance with different properties than the original iron and sulfur. Additionally, the mass of the iron sulfide formed would be equal to the combined masses of the iron and sulfur used in the reaction, as mass is conserved in chemical reactions.
List two observations from the vinegar lab that imdicates a chemical reaction took place?
Bubbles
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.
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.
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 determine whether a reaction took place?
Use the following equation: delta G = delta H - T*deltaS. A reaction is spontaneous if delta G is negative. A reaction will always be spontaneous (under any temperature) only if the change in enthalpy (delta H) is negative and the change in entropy (delta S) is positive. If this is not the case, the reaction will only be spontaneous (negative delta G) for a range of temperatures (or could be always non-spontaneous)
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.
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.
How did invention of fire took place and when?
Fire was not "invented" - it is a chemical reaction that has taken place long before any humans were involved. Human beings have had the ability to control fire for hundreds of thousands of years, if not longer. Nobody knows exactly when and how this first took place - the only evidence we have is the use of fire in eg. making tools that we can find through archeological digs.
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.
What evidence indicates that a chemical change took place when the iron and sulfur combined to form iron sulfide?
Evidence of a chemical change between iron and sulfur to form iron sulfide includes color change (from grey to black), formation of a new substance with different properties, and the release of heat energy during the reaction. Additionally, chemical analysis showing the presence of iron and sulfur atoms in the product confirms a chemical transformation has taken place.
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
