Answer: It is important to wet the filter paper in the Buchner funnel first with cold re crystallization solvent before the re crystallization mixture being filtered to minimize gaps around the edges of the filter paper which can prevent mechanical impurities from passing through. This gives better filtration where most impurities can be filtered. Furthermore, it provides good vacuum.
Because H is a non-metal, it has the highest electronegativity. Option (1) H is correct.
Hope this would help~
The answer would be D Heterogeneous
Answer:
2.0 grams per cubic centimeter
Explanation:
(You can refer to the DMV triangle to help you solve this!)
Density = Mass/Volume
Density = 4.0g/2.0cm3
Density = 2.0g/cm3
Hope this helps!!!
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In his version of the periodic table, Mendeleev based his arrangement of the elements on an element's atomic mass.
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