When electrons absorb energy they are able to move from their ground states up to excited states. The answer is letter B. an example of this is when you light a match. The molecules of the matchstick are in its ground state. When you flick it on the ground or anything hard, it causes its molecules to move into the excited state and thus causing fire.
B. The critical temperature is the temperature above which the liquid phase of a pure substance cannot exist.
C. The critical temperature is the temperature below which the liquid phase of a pure substance cannot exist.
D. The critical temperature is the temperature at which all three phases can coexist.
E. The critical temperature is the temperature at which the pure substance reaches, but cannot go beyond, the critical pressure.
Can someone explain this one?
Answer:what do u mean tho
Explanation:
Gases, fluids, and other solids in contact with a moving object will produce heat flow due to friction. This is called heat transfer where heat energy is transferred from the high to low.
a. 0.61 years
b. 0.76 years
c. 1.24 years
d. 1.39 years
Answer:
b. 0.76 years
Explanation:
Mercury is the closest planet to the Sun and the Earth is the third planet from the Sun.
The orbital period of the Earth is 1 year.
Orbital period of the Mercury is 88 days = 0.24 years (Earth years)
Thus, the difference between the orbital periods of Mercury and Earth is
1 year - 0.24 years = 0.76 years
Thus, the correct option is b.
Volatile organic compounds are compounds that easily evaporate at standard room temperature and pressure. They are considered harmful to the environment if regulations are not followed. Examples of this are:
Benzene
Ethanol
Benzopyrene
Ethenone
Acetic acid
Methane
Butane
Heptane
Pentane