An unknown substance dissolves readily in water but not in benzene (a nonpolar solvent). molecules of what type are present in the substance?
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Polar is the type of molecule that are present in the substance. Polar molecule is defined as the one in which the atoms are arranged such that one end of the molecule has a positive charge and the opposite end has a negative charge. So, that answer in this question is POLAR.
To wear the full equipment.
when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.