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.
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.
| 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.
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.
Frequently Asked Questions
Name the gas that evolved in the reaction?
The gas that evolved in the reaction is hydrogen gas.
What happens when zinc reacts with sulphuric acid?
When zinc reacts with sulphuric acid, it produces hydrogen gas and zinc sulphate.
How will you confirm that the gas evolved is hydrogen?
To confirm that the gas evolved is hydrogen, bring a burning matchstick near the mouth of the test tube. If the gas burns with a pop sound, it will confirm the presence of hydrogen gas.
Why is there a change in the reaction observed?
The change in the reaction is observed due to the fact that zinc being more reactive than hydrogen will displace it from dilute acid.
What type of reaction is it?
It is a type of displacement reaction of a non-metal by a metal.
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