What is called the system in a chemical reaction?

The part being studied in the reaction

Everything outside the reaction

If a chemical reaction is carried out in a beaker what can be considered the surroundings?

The beaker and its external environment

Class 9 Chemistry · Chapter 5 · Test 1

System, Surroundings and Energy

25 MCQs covering system and surroundings, energy transfer between system and surroundings, endothermic and exothermic energy flow, signs of enthalpy change, chemical energy, heat energy, and basic concepts of energetics.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
What is called the system in a chemical reaction?
- AEverything outside the reaction
- BThe part being studied in the reaction
- COnly the container
- DOnly the surroundings
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Answer: B
The system is the part of the physical or chemical process that is being studied.
Question 2
What are the surroundings in a chemical reaction?
- AThe reacting substances
- BEverything outside the system
- COnly the products
- DOnly the reactants
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Answer: B
Everything that does not belong to the system is called the surroundings.
Question 3
Which of the following can be part of a chemical reaction system?
- AReactants and products
- BOnly the beaker
- COnly the burner
- DOnly the room
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Answer: A
The system can include reactants products catalyst solvent and other substances involved in the reaction.
Question 4
If a chemical reaction is carried out in a beaker what can be considered the surroundings?
- AOnly the reactants
- BThe chemical equation
- CThe beaker and its external environment
- DOnly the products
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Answer: C
The beaker and everything outside the defined reaction system can be considered surroundings.
Question 5
What happens when energy is transferred from the surroundings to the system?
- AThe system loses energy
- BThe system gains energy
- CThe surroundings gain energy
- DNo energy is transferred
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Answer: B
Energy entering the system causes the system to gain energy.

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