write a materials required,aim, procedure, conclusion and observation
Answers
ACTIVITY 1.2
AIM :- To observe a chemical reaction.
MATERIALS REQUIRED :- Two test tubes, lead nitrate, potassium iodide.
PROCEDURE :-
- Take two test tubes and add lead nitrate and potassium iodide in the test tubes respectively to make a solution.
- Now, add potassium iodide solution to the lead nitrate solution.
- Observe the changes occurring.
OBSERVATION :- The solution changes into a bright yellow color.
CONCLUSION :- In a chemical reaction, the solution can change color.
ACTIVITY 1.3
AIM :- To observe a chemical reaction.
MATERIALS REQUIRED :- Zinc granules, conical flask or a test tube, dil. hydrochloric acid or sulphuric acid.
PROCEDURE :-
- Take a conical flask and put some zinc granules in it.
- Add dil. hydrochloric acid or sulphuric acid in it.
- Observe the changes.
OBSERVATION :- The bubbles start coming out and the conical flask or the test tube becomes warm.
CONCLUSION :- The reaction is a single displacement reaction where zinc displaces the hydrogen to form hydrogen gas and the resulting colution is zinc chloride. Zinc reacts quickly with the acid to form bubbles of hydrogen.
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➡Aim:-
To show change in state and colour when a chemical reaction takes place.
➡Apparatus:-
lead nitrate solution, potassium iodide solution, test tube, and a conical flask.
➡Procedure:-
Take lead nitrate solution in a test tube Add potassium iodide solution to this.
➡Observation:-
lead nitrate reacts with potassium iodide to give lead iodide and potassium nitrate.
The colour of the products is different from that of the reactants.
➡Conclusion:-
Pb(NO3)2 + 2KI → PbI2 + 2KNO3.
The change in colour is because lead iodide and potassium nitrate have been formed after the reaction. PbI2 is a yellow ppt. KNO3 is a colourless solution.
☆☆here is your another answer :-
➡Aim:-
To show the interaction between zinc granules and hydrochloric acid or sulphuric acidformation of H gas)
➡Apparatus:-
Zinc granules, conical flask, test tube, hydrochloric acid / sulphuric acid
➡Procedure:-
Take a few zinc granules in a conical flask or a test tube. Add dilute hydrochloric acid or sulphuric acid to this.
Touch the conical flask or test tube.
➡Observation: -
A gas is evolved and the conical flask is warm
➡Conclusion:-
From this we conclude that when a chemical reaction takes place there is a change in the state, colour, and temperature.
Zn + 2HCl → ZnCl2 + H2↑ + heat .
Zn + H2SO4 → ZnSO4 + H2↑ + heat.
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