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Zn (s) + 2HCl (aq) → H2 (g) + ZnCl2 (s)

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10y ago

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How does the evolution of gas occur in a chemical reaction give an example?

This is a sign of a chemical reaction.


Give an example of an oxidation reaction and tell which substance loses electrons?

An example of an oxidation reaction is the reaction between magnesium and oxygen to form magnesium oxide: 2Mg + O2 -> 2MgO. In this reaction, magnesium loses electrons to form magnesium ions, Mg²⁺, thereby undergoing oxidation.


What two ways is energy involved in a chemical reaction?

When a chemical change occurs, there are two types of ways heat can be involved. In an endothermic reaction, more heat enters the reaction than leaves. In an exothermic reaction, more heat leaves the reaction than enters.


Is it a chemical or physical reaction?

What do u mean by chemical or physical reaction... Please give me an answer so i can give you the answer.


What is catalysis give example?

Catalysis is the use of a catalyst in a reaction.Certain substances, called catalysts, can increase the rate of a reaction without being consumed by it.An example is the decomposition of H2O2: 2222(aq)22Catalysts can be described as being homogeneousor heterogeneous.Homogeneous: reaction takes place within a single phase, as in the example above with the H2O2.Heterogeneous: reaction involves two different phases, as in the example that follows. 2N2O ----> 2N2 + O2 - this reaction is usually slow, but if the reactants are bought into contact with a metal such as gold, the reaction speeds up considerably.A catalyst lowers the activation energy required for the reaction. Let me know if this helped or if there is a certain thing that you need me to cover about it.