Answer:
The first law of thermodynamics then reduces to
dQ = dW + dU ⇒ dU = −dW (1)
where dW is the amount of work done by the gas and dU is the change in internal energy.
Since the gas is expanding, the work being done by the gas is positive. Eqn. (1) then implies that the change in internal energy of the system must be negative, that is, the internal energy
is decreasing. The only true statements are then:
• The work done by the gas is positive, and no heat exchange occurs.
• The internal energy of the system decreases.
Answer:
thermite reaction
Explanation: The reaction between iron(III) oxide and aluminum produces aluminum oxide and iron. The chemical equation of the reaction is: This reaction is known as a thermite reaction and is highly exothermic. The large amount of heat released is enough to melt oxygen and aluminum.
During which period of time?
No list to choose from.. but..
Local government, in general, has authority to determine and execute measures within a restricted area inside and smaller than a whole state. Some degree of local government characterizes every country in the world, although the degree is extremely significant.
Developed countries are experiencing <u>negative</u> population growth.
