Answer: True
Explanation: A solvent is any liquid, solid or gas (etc.) that is capable of dissolving another substance, typically called a solute. The amount of solute a solvent can dissolve depends on the temperature.
Answer: The reaction does occur.
Explanation: For the reaction of aqueous strontium sulfide and aqueous copper(II) sulfate, the reaction follows:

This reaction is a type of precipitation reaction.
The precipitate formed is CuS which is black in color.
Answer:
hydrogen are converted into energy I dont know other
Warm air rises, cool falls. (a)
Answer:
0.20 mol's
Explanation:
1.675 L = 1.675 dm^3
moles = V/(conc):
moles = 1.675/(8.5)
moles = 0.1970... --> 0.20