What\'s the right moment to record the temperature when you are trying to determ

Question

What's the right moment to record the temperature when you are trying to determine boiling point of a volatile liquid using the microboiling point apparatus? When the bubbles emerge rapidly from the capillary When the bubbles stop When the liquid reenters the capillary tube When you stop to heat the oil In the extraction, which one is wrong? The equipment for extraction is called separatory funnel The density of bottom layer is higher than that of top layer. In order to do an extraction, two solvents which can be miscible must be used Vent the separatory funnel occasionally during the shaking Which way cannot be used to induce recrystallization? Ice bath Scratch the inside of the beaker with a glass rod Add more solvent "Seed" the solution Baeyer test tested positive for eugenol

Explanation / Answer

1.A

Initially bubbles of air present in the water, comes out first.On continues heating bubbles form and collapse on the bottom of the container.

The bubbles rise from the bottom and break free at the top very rapidly.

2. C is the answer.

Solvent partitioning needs two solvents that are not miscible in each other.

3.B

4.B

Bayers test and ferric chloride tests positive for Eugenol.

Bayers test and ferric chloride tests negative for acetyleugenol.

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