When water is added to quicklime (calcium oxide), a vigorous chemical reaction takes place producing slaked lime (calcium hydroxide). A large amount of heat is released during the reaction, making the container hot. This is an exothermic reaction.
Experiment 1.1
In this experiment, students will explore the fascinating reaction of magnesium ribbon when it is heated. Through clear animation and step-by-step explanation, students will observe how magnesium reacts with oxygen to produce a bright white flame and forms a new substance called magnesium oxide.
This experiment is one of the most important foundational experiments in Class 10 Science because it helps students understand:
Chemical reactions
Combination reactions
Formation of metal oxides
Physical and chemical changes
The animated explanation makes it easy for students to clearly see each stage of the reaction, understand why it happens, and remember it for exams and practicals.
Instead of simply memorizing reactions from the textbook, students will actually visualize the process and learn the scientific concept behind it in an engaging and practical way.
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Experiment 1.2
When lead nitrate solution is mixed with potassium iodide solution, a chemical reaction takes place and a bright yellow precipitate of lead iodide is formed. This reaction is called a double displacement reaction because the ions of the two compounds exchange places. The yellow precipitate indicates the formation of a new substance.
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Experiment 1.3
When zinc granules are added to blue copper sulphate solution, zinc displaces copper from the solution because zinc is more reactive than copper. As the reaction occurs, the blue color of the solution becomes lighter and a reddish-brown deposit of copper forms on the zinc granules. This reaction demonstrates a displacement reaction.
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Experiment 1.4
When water is added to quicklime (calcium oxide), a vigorous chemical reaction takes place producing slaked lime (calcium hydroxide). A large amount of heat is released during the reaction, making the container hot. This is an exothermic reaction.
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Experiment 1.5
When ferrous sulphate crystals are heated, they first lose water of crystallisation and change from green to white. On further heating, the compound decomposes and releases gases with a burning sulphur smell. A brown residue of ferric oxide is left behind. This is a decomposition reaction caused by heat, also called thermal decomposition.
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Experiment 1.7
Electrolysis is a chemical process in which electric current is passed through a liquid to break it into simpler substances. In this experiment, electric current is passed through acidified water using graphite electrodes. As the current flows, water decomposes into hydrogen and oxygen gases. Hydrogen gas is released at the cathode and oxygen gas at the anode. The amount of hydrogen collected is twice the amount of oxygen, proving that water is made up of hydrogen and oxygen in a 2:1 ratio.
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