Bose Einstein condensation occur at temperature very close to absolute zero i.e 273.15 degrees centigrade.. Under such conditions, large quantity of Boson occupies the lowest quantum state, at which point microscopic quantum phenomena becomes apparent macroscopically. A BEC is formed by cooling a gas of extremely low density about one hundred thousandth the density of normal air, to ultra low temperature.
Answer:
(a) 0 J
(b) -9.5 J
(c) -18 J
Explanation:
A gas expands in volume from 26.7 to 89.3 mL at constant temperature. The change in volume is:
ΔV = 89.3 mL - 26.7 mL = 62.6 mL = 0.0626 L
The work done (w) can be calculated using the following expression.
w = - P × ΔV
where,
P is the pressure
<em>(a) against a vacuum (P = 0)</em>
w = - P × ΔV = - 0 atm × 0.0626 L = 0 atm . L = 0 J
<em>(b) against a constant pressure of 1.5 atm</em>
w = - P × ΔV = - 1.5 atm × 0.0626 L × (101.3 J/1 atm.L) = -9.5 J
<em>(c) against a constant pressure of 2.8 atm</em>
w = - P × ΔV = - 2.8 atm × 0.0626 L × (101.3 J/1 atm.L) = -18 J
Hello!
<span>A chemical that will ignite spontaneously in air at a temperature of 130 degree fahrenheit (54.4 degree celsius) or below is identified by the term pyrophoric.
Pyrophoric substances are those that ignite spontaneously when in contact with air at 130 °F or below. Some substances that are pyrophoric include Iron Sulfur (FeS) or some metals like finely powdered Uranium. To handle pyrophoric substances, it is required to work in an inert atmosphere (i.e. an atmosphere without oxygen).
Have a nice day!</span>
Answer:
decomposition of water
Explanation:
The reaction will represent the decomposition of water. It usually carried by an electrolytic process in the laboratory.
- Water molecule is broken down into its constituent hydrogen gas and oxygen gas components.
- The breaking down of one compound to give other compounds is decomposition.
- This is not a replacement reaction.
- In decomposition, we often start with a single reactant and results in one or more products.