However when the boy ate the chocolate happily, suddenly his father pounced on him. Is this sentence correct?​

The correct sentence would be:

However, whilst the boy was eating the chocolate happily, his father pounced on him suddenly.

However, once the boy ate the chocolate happily; his father pounced on him suddenly .

or

However, once the boy ate the chocolate happily. Suddenly, his father pounced on him.

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no

the best practice

1. keep your workspace clean

2. wash your hands

3. seperate and clean chemicals and equipment

4.   use microfiber cleaning utensils

5. clean and sanitize all work surfaces

hope this !