Give two differences between a physic
4. Explain why the burning of a candle is an example of both physical as well as chemical changes.
Think and answer
1. The processes of boiling and evaporation are physical changes. Why?
2. Sublimation of ammonium chloride is a physical change. Why?
3. When finely powdered iron and sulphur are heated together, a chemical change occurs. Why
Projects & Activities
Activity: Write an invisible message
Cut a lemon and squeeze it to get some lemon juice. Use this juice as your ink'.
Vrite a short message for your friend on a piece of paper with the help of a
aintbrush. Let it dry. Can you see anything on the paper? Now, press the paper
th a hot iron. As the paper gets warm, what do you find? The message will appear
colour!
Life Skills
Life Skills
rve some changes in your surroundings for
Answers
Answer:
4.ans : as the candle burns,the wax starts melting which is physical change, also the flame of the candle converts the wax into vapour and carbon dioxide due to burning which is an example of chemical change hence burning candle is an example of both physical and chemical change
1.ans.: the process of boiling and evaporation is physical change because this process can reversed back and also no new substance is formed by the process. the evaporate d water can bought back to its original state by using some physical processes
2. answer : sublimation is the process of change of solid directly into vapour . As there is no change In the composition the compound just a change of state ,sublimation process is a physical change .Ammonium chloride decomposes into ammonia and hydrochloric acid at it's sublimation temperature
3. sorry I don't know the answer
Explanation:
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