Answer: Talking about the progress of a chemical reaction all the three statements are correct because;
(1) When a reaction is occurring the spontaneous change occurs in the direction where equilibrium will be achieved.
(2) Exothermic reactions are those in which the release of heat energy happens. And when there is release of energy in a reaction, the reaction will be spontaneous.
(3) In a chemical reaction, law of energy conservation applies, which means the mass of reactant we started with will be equal to the mass of product obtained.
Hence, (d) is the right choice.
Answer:
Does a reaction occur when aqueous solutions of copper(II) nitrate and calcium chloride are combined?
Explanation:
The given reaction is an example of a chemical double displacement reaction.
The mutual interchange of the ions takes place.
The balanced chemical equation of the reaction is:
All the products formed are also highly soluble.
So, all the ions are spectator ions.
Hence, all will cancel with each other and ions remain in the net ionic equation and hence, the reaction does not take place.
Answer:
All food chains start with energy from the sun. This energy is captured by plants. Thus the living part of a food chain always starts with plant life and ends with an animal.
The dependent variable is what is being tested. independent is what forces or effects the dependent
Answer:
C. Base.
Explanation:
Hello there!
In this case, according to the given information, it turns out convenient for us to realize that the concept acid and base we should use here is based off the Bronsted-Lowry one, which says that an acid is a hydrogen donor. In such a way, since water accepts one H ion as it goes to H3O⁺, we infer it is C. Base and the H2S the acid.
Also, we can tell HS⁻ is the conjugate base and H3O⁺ the conjugate acid.
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