Chemistry · Thermochemistry
Work through this past-paper style MCQ, then read the full explanation. Practice more chemistry questions on mMCQ with adaptive practice and topic analytics.
Students were decomposing 𝐶𝑎𝐶𝑂3 placed in a China dish by heating using burner in the laboratory. The “system” in this experiment is:
- A
China dish
- B
Burner
- C
Laboratory
- D
𝐶𝑎𝐶𝑂3
The system is the collective substances in the reaction such as the reactants and products. The surroundings are everything around the reaction such as the reaction flask and the room. During a reaction, energy is transferred between the system and its surroundings. The system and surrounding together make up the universe.
The China dish acts as a container and does not participate in the reaction. It is part of the surroundings.
The burner provides heat and is part of the surroundings that affect the system, but it is not the system itself.
The laboratory encompasses the entire environment where the experiment takes place, and it serves as the surroundings.
The system consists of the substances undergoing the chemical change, in this case, 𝐶𝑎𝐶𝑂3, which is being decomposed. It represents the core focus of the reaction.
Tagged under Chemistry · Thermochemistry · 2018