A physical change occurs when there is no change in the composition of a substance and no change in the chemical nature of the substance.
The interconversion of state occurs during physical change.
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SOLID ⇄ LIQUID ⇄ GAS
A chemical change is a change that causes a change in the chemical properties of matter, resulting in the formation of a new substance. As an example, consider the burning of oil or fuel.
Heat is evolved or taken in, the formation of bubbles, gas, and fumes, as well as a change in the colour of the reactants, can take place when they form a product.
Reactants → Products
A + B → C (Chemical reaction)
Table of Contents
- Aim
- Materials Required
- Theory
- Procedure
- Observation
- Result
- Precautions
- Frequently Asked Questions – FAQs
Aim
To carry out the reaction of Zinc with dilute sulphuric acid and classify it as physical or chemical changes.
Materials Required
- Zinc granules, dil. Sulphuric Acid, Clamp Stand, Boiling Tube, Cork fixed with a fine
- capillary tube.
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Also Read: Experiment on the Reaction of Zinc with Dilute Sulphuric Acid Viva Questions
Theory
Zinc, being more reactive or being higher up in the reactivity series than hydrogen, displaces hydrogen from dilute acids.
Procedure
1. Take 5mL of dilute sulphuric acid solution in a test tube.
2. Add zinc granules to it in such a way that zinc pieces are completely immersed in them.
3. Immediately, fix a cork having a delivery tube with a fine jet, on the mouth of the test tube.
4. Bring a burning matchstick near the mouth of the fine jet.
Observation
1. A brisk reaction can be observed and gas bubbles come out.
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2. The gas coming out of the jet burns instantaneously with a pop sound or a small explosion which confirms the presence of hydrogen gas.
Result
1. Zinc reacts with dilute sulphuric acid to produce hydrogen gas and zinc sulphate.
Zn + H2SO4 → ZnSO4 + H2
2. Hydrogen gas burns with a pop sound.
3. It is a type of displacement reaction of a non-metal by a metal.
4. The reaction is an example of chemical change.
Precautions
1. Use caution when handling the chemicals.
2. Do not inhale the emitted gas.
3. To test hydrogen gas, use a small jet, as hydrogen gas burns instantly with an explosion.
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