what is the purpose of the water trap that is connected in the condenser in the set up shown below

Q: sintering means:   a.Shock cooling of molten glass to make frits. b.The molecular bonding of ceramic particles below their melting point.  c.Melting of non-refractory clay constituents. d.Condensation of constituent particles to form greenware.

See image below. Table provided is for this question. I want to double check to see if my answer is correct!

What is the volume of a ceramic evaporating dish closest to?   Question 9 options:   25 mL   5 mL   150 mL

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Liquid A is known to have a lower surface tension and lower viscosity than Liquid B. Use these facts to predict the result of each experiment in the table below, if you can. experiment Small amounts of Liquid A and Liquid B are sprayed into the air, where they form perfect spheres with a volume of 20.0 µL. The diameters of these drops are measured with a high-speed camera, and their surface areas S and S calculated. A 20.0 mL of Liquid A are poured into a beaker, and 20.0 mL of Liquid B are poured into an identical beaker. Stirrers in each beaker are connected to motors, and the forces F and F needed to stir each liquid A В at a constant rate are measured. predicted outcome OS will be greater than Sp will be less than SB OS will be equal to SB It's impossible to predict whether SA or SB will be greater without more information. FA will be greater than FB А OFA will be less than FB F will be equal to F B It's impossible to predict whether For Fg will B be greater without more…

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V5

This next picture shows 6 more substances to be tested. These will be burned in solid form. Note that there are 3 elemental powders, small pieces of charcoal, a wooden splint, and a piece of steel wool. Selenium powder Sulfur Copper powder Charcoal

It is also important to place a boiling stone in the round bottom flask (or use a stir vane).  Why do you think this is necessary?