Interpretation:
The examples of chemical system are to be given and universe in terms of those examples is to be explained.
Concept introduction:
System: The system is defined as the part which involves energy changes.
Surroundings: The rest part excluding system is known as surroundings.
Universe: Universe comprises of system and surroundings.
Universe = System + surroundings.

Answer to Problem 70A
Example 1: If we carry a
Here glass beaker and surroundings collectively is universe.
Example 2: Hot water in a thermos is also an example of chemical system.
Here flask and surroundings collectively is universe.
Explanation of Solution
Chapter 15 Solutions
Chemistry: Matter and Change
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