what is a chemical equation? Explain how it can be represented.
Explain the evolution of a gas in chemical reactions with the help of examples
Some chemical reactions are characterized by a change in colour. Explain with the help of examples.
Some reactions are characterized by the formation of precipitate. Explain with the help of examples.
What are photochemical reactions? Explain with the help of examples.
write a short note on enzymes as catalysts
Answers
Answer:
2.Change in colour. 3.Formation of a precipitate. ... The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas. ... In this reaction colour changes from colourless to yellow. 3. ... Wax is solid water is a liquid whereas carbon dioxide gas. ... This will help us to improve better.
Explanation:
Answer:
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side.
A gas evolution reaction is a chemical reaction in which one of the end products is a gas such as oxygen or carbon dioxide. Gas evolution reactions may be carried out in a fume chamber when the gases produced are poisonous when inhaled or are explosive. In this example, hydrogen gas in diatomic form is released.
The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas. ... Reaction between lead nitrate solution and potassium iodide solution. Pb(NO3)2(aq) +2KI -------> PbI2(s) + 2KNO3(aq) In this reaction colour changes from colourless to yellow.
One of the best examples of precipitation reactions is the chemical reaction between potassium chloride and silver nitrate, in which solid silver chloride is precipitated out. This is the insoluble salt formed as a product of the precipitation reaction.
A Photochemical reaction is a reaction which takes place when a chemical process absorbs light energy as its energy source. The example is photosynthesis. ... The photons from the light energy split water and enable ATP production that drives the entire process.