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Chemistry, 24.01.2020 20:31 monai2005

What are the four important steps needed to obtain accurate meting points on a mel-temp? select four options:

1. grind the sample into a fine powder.
2. put the smallest amount you can see in a capillary tube.
3. fill the capillary tube with about 3mm of powder.
4. set the voltage to rise quickly to 20 degrees below the expected temperature, then re-adjust so the temp rises at 2 degrees per minute.
5. set the voltage to rise quickly to 20 degrees below the expected temperature, then re-adjust so the temp rises at 10 degrees per minute.
6. record the temp at which liquid first appears and the temp at which the last crystal disappears.
7. record the temp at which the sample completely melts and the temp when it boils.

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