Answer:
A. Ca(OH)2 ----> CaO + H2O; ∆H = +109KJ
B. Check attached document below for the enthalpy diagram
Explanation:
A thermochemical equation is a balanced chemical equation in which enthalpy change is variable. It tells about the nature of the reaction.
Enthalpy change is the difference between the heat content of the products and reactants in a thermochemical equation.
∆H is negative for an exothermic reaction (a reaction where heat is given out), while it is positive for an endothermic reaction ( a reaction in which heat is added).
The activation energy, Ea, is the minimum amount of energy reactant particles must possess in order for a reaction to proceed towards product formation.
In combustion reactions the products are always carbon dioxide(CO2) and water(H20)
Answer:
Nuclear fission
Explanation:
All nuclear reactors in operation are based on the principle of nuclear fission of Uranium nuclide to produce energy. These is produced is being controlled and is used in heating water to steam. The steam is then harnessed to drive or power steam turbines which is used for the generation of electricity.
Answer:
27.9 grams of Fe2O3
Explanation:
* = = 27.9 grams
Looking at the model given, I simply found the molar mass of Fe2O3 so I can set up an equation to find the number of grams. The molar mass of Fe2O3 is 159.69 grams. Since we are given that there are 0.175 moles of Fe2O3, then we can use that first in our equation. As you can see, I used the conversion factor <em>159.69 grams Fe2O3 = 1 mole Fe2O3. </em>By using this conversion factor, it was easy for me to set up an easy equation so I can find the number of grams of Fe2O3 when given 0.175 moles of Fe2O3.
After doing the math and following the rules of significant figures, you will end up with 27.9 grams Fe2O3 which is answer choice D