A student performs the following experiment in his school laboratory. List two observations to justify that in this experiment a chemical change has taken place.
A student performs the following experiment in his school laboratory. List two observations to justify that in this experiment a chemical change has taken place.
Official answer
Two observations to justify that in this experiment a chemical change has taken place are: 1. The color of the solution changes from colorless to yellow. 2. The solution becomes hot.
Marking scheme
- 1.Observation 1: Color change from colorless to yellow
- 2.Observation 2: Solution becomes hot
Hint
Look for changes in color, temperature, or other physical properties that indicate a chemical reaction has occurred.
Quick oral answer
A chemical change has taken place in this experiment because the color of the solution changes from colorless to yellow, and the solution becomes hot. These observations indicate that a chemical reaction has occurred, resulting in the formation of a new substance with different properties.
Common mistakes
- 1.Confusing physical changes with chemical changes
- 2.Not considering all possible observations
Analysis and explanation
The question requires the student to analyze the experiment and identify two observations that justify a chemical change has taken place. The correct answer is based on the principles of chemical reactions and the characteristics of chemical changes.
Interesting facts
Chemical reactions can result in changes in color, temperature, or other physical properties.
Chemical reactions involve the breaking and forming of chemical bonds.
Question details
Q21 of 39 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2025
- Section
- Section B
- Marks
- 2
- Type
- Very Short Answer
- Chapter
- Chemical Reactions and Equations
- Topic
- Chemical Reactions
- Bloom's level
- Knowledge
- Syllabus topic
- Chemical Reactions and Equations
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2025?
This question carries 2 marks in the CBSE Class 10 Science 2025 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Chemical Reactions and Equations" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Chemical Reactions" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2025 paper?
This is a Very Short Answer question from Section B in the CBSE Class 10 Science 2025 paper.