Classify the following as chemical or ph | Class 9 Science Chapter Is Matter Around Us Pure, Is Matter Around Us Pure NCERT Solutions

Question:

Classify the following as chemical or physical changes:

• cutting of trees,
• melting of butter in a pan,
• rusting of almirah,
• boiling of water to form steam,
• passing of electric current, through water and the water breaking down into hydrogen and oxygen gases,
• dissolving common salt in water,
• making a fruit salad with raw fruits, and
• burning of paper and wood.

Answer:

Physical change: There is no change in the chemical nature of substance. Only state change. for example: ice - water - water vapour.

Chemical change: A substance reacts with another substance and makes a new substance. It is an irreversible reaction.

• Physical change
• Physical change
• Chemical change (hydrated iron oxide)
• Physical change
• Chemical change
• Physical change
• Physical change
• Physical change (Co2, smoke, water vapour, ash)


Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

  • Read the question carefully and focus on the core concept being asked.
  • Reference examples and data from the chapter when answering questions about Is Matter Around Us Pure.
  • Review previous year question papers to get an idea of how such questions may be framed in exams.
  • Practice answering questions within the time limit to improve your speed and accuracy.
  • Discuss your answers with your teachers or peers to get feedback and improve your understanding.

Comments

Comment(s) on this Question

Welcome to the NCERT Solutions for Class 9 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 4 , Question 1: Classify the following as chemical or physical changes: • cutting of trees, • melting ....