Answer:
It increases in value positively
Explanation:
The entropy of a chemical reaction can be defined as the degree of disorderliness. Hence when we talk about entropy, we are talking about the degree of randomness associated with that specific chemical reaction. The burning of wood is a kind of spontaneous reaction.
For a reaction to be spontaneous, the change in free Gibbs energy must be negative. To make this a reality, at constant enthalpy, the reaction temperature and change in entropy is expected to be negative in value. To get this negative value needed, it is essential know that the value of the entropy must increase as the temperature of the burning wood is increasing too.
Answer:
c. all matter is composed of small particles,which combine to make larger objects
Answer:
ΔH = +26.08 kJ/mol
Explanation:
The change in enthalpy (ΔH) is given in J/mol, and can be calculated for dissolution by the equation:
ΔH = m(water)*Cp*ΔT/n(solute)
The mass of water is the density multiplied by the volume
m = 1g/mL * 25.0mL = 25.0 g
The number of the moles is the mass divided by the molar mass. Knowing the molar masses of the elements:
N = 14 g/mol x 2 = 28
H = 1 g/mol x 4 = 4
O = 16 g/mol x 3 = 48
NH₄NO₃ = 80 g/mol
n = 1.25/80 = 0.015625 mol
So,
ΔH = 25*4.18*(25.8 - 21.9)/0.015625
ΔH = 26,083.2 J/mol
ΔH = +26.08 kJ/mol
Answer:
302 kj heat is released by lowering the temperature
Answer:
Hydrogen is a very reactive element. It doesn't exist as a single atom in nature. Neither do any of the other binary nonmetals -- nitrogen, oxygen, fluorine, chlorine, bromine, and iodine. They're too prone to react with something. They react with each other and form binary molecules because the binary molecules are more stable than single atoms (by a lot!). Compounds with other atoms are even more stable, so hydrogen reacts with oxygen to form water, and chlorine reacts with sodium to form table salt.
Explanation:
