Classify the following as open, closed, or isolated system.
a. A beaker containing as open, boiling water.
b. A chemical reaction taking place in an enclosed flask.
c. A cup of tea placed on a table.
d. Hot water placed in perfectly insulated closed container.
e. A thermos flask containing hot coffee.

Explanation

To classify the systems as open, closed, or isolated, we will analyze each scenario based on the definitions of these systems.

### Step-by-Step Solution:

1. **Identify the system types:**
- **Open System:** Can exchange both matter and energy with the surroundings.
- **Closed System:** Can exchange only energy (not matter) with the surroundings.
- **Isolated System:** Cannot exchange either matter or energy with the surroundings.
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