Answer: Nucleus of an atom is heavy and positively charged because nucleus is only made up of protons and neutrons.
Atoms move faster when temperature is high. Example is in the gas phase. Atoms move slower in lower temperatures because molecules are contricted because they have no heat energy. Example is solid ice. Medium temperature example can be liquid water.
Answer:
a) the system is closed
b) the system is open
Explanation:
a) the system can be characterised as closed system. If we define the boundaries of this system as an envelope that contains the bathtub, then there will not be any mass transfer to the environment through the boundary → then the system is closed ( the mass of the system remains constant)
b) on the other hand , taking the same system as in the first case, if the hot water is continually added to the tub , then there is water flow through the boundary (from the environment to the system) → then the system is open ( the mass of the system can be altered)
Answer:
125 cubic meters
Explanation:
Subtract 375-250=125 cubic meters
