Class 7th Science NCERT Chapter 6
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Topics to study from the chapter "Physical and Chemical Changes" are:
1. Physical Changes
– Changes in size, shape, color, and state of a substance
– Reversibility of physical changes
– Examples of physical changes (like cutting paper, melting ice)
2. Chemical Change
– Rusting of iron as a familiar example
– Formation of new substances in chemical changes
– Reactions involving magnesium (burning magnesium, forming magnesium oxide)
– Reaction of copper sulphate with iron to form iron sulphate and copper
– Vinegar and baking soda reaction producing carbon dioxide and its test with lime water
These topics cover the distinction between physical and chemical changes, examples of each, and reactions involving specific substances like magnesium and copper sulphate7.
What are the two broad categories of changes discussed in the chapter?
Define physical change with an example from the chapter.
Explain the process of rusting of iron as described in the chapter.
What chemical reaction takes place when magnesium burns, as mentioned in the chapter?
Describe the experiment in Activity 6.7 related to copper sulphate and iron. What are the new substances formed in this activity?
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