Answer:
New substances are produced by a chemical change
Answer:
1. HNO3
2. HNO2
Explanation:
Nitrogen acid may refer to any of:
1. Nitric acid, HNO3 or
2. Nitrous acid, HNO2
Acid rain is caused by a chemical reaction that begins when compound like nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain. nitrogen oxides dissolve very easily in water and can be carried very far by the wind. As a result, the compounds can travel long distances where they become part of the rain, sleet, snow, and fog as acids.
Equation of reaction:
NO2 + H2O ==> HNO3
NO + H2O ==> HNO2
Answer:
I cant really see the individual problems very well but i hope this helps
Explanation:
Decomposition = one thing -> 2 or more things
Synthesis= 2 or more things -> 1 thing
Answer:
The amount of heat is 84.4894kJ
Explanation:
Given data:
mass of octane=148g
The moles of octane is:
![n_{octane} =148g*\frac{1mol}{114.23g} =1.2956moles](https://tex.z-dn.net/?f=n_%7Boctane%7D%20%3D148g%2A%5Cfrac%7B1mol%7D%7B114.23g%7D%20%3D1.2956moles)
The melting point is=-56.82°C
ΔHfus=20.73kJ/mol
The heat of fusion is:
![Q_{fus} =n_{octane} *delta-H_{fus} =1.2956*20.73=26.8578kJ](https://tex.z-dn.net/?f=Q_%7Bfus%7D%20%3Dn_%7Boctane%7D%20%2Adelta-H_%7Bfus%7D%20%3D1.2956%2A20.73%3D26.8578kJ)
The heat to bring the octane to a temperature of 117.8°C is:
![Q_{2} =mCp(117.8-(56.82))=148*2.23*(117.8+56.82)=57631.5848J=57.6316kJ](https://tex.z-dn.net/?f=Q_%7B2%7D%20%3DmCp%28117.8-%2856.82%29%29%3D148%2A2.23%2A%28117.8%2B56.82%29%3D57631.5848J%3D57.6316kJ)
The total heat in the process is:
Qtotal=Qfus+Q₂=26.8578+57.6316=84.4894kJ