Question

b. ne chemical reaction involved in burning wood
c. Less energy is released than is used by the reaction
3. Why is a spark of energy required to begin the chemical reaction of
burning a fossil fuel? What is another name for this spark of energy?
4. The reaction below is an exothermic reaction
K2O (s) CO2 (g) K2CO3 (s)
a. Rewrite this reaction and add "t energy" in the correct location.
b. Describe how the energy level of the reactants compares to the energy
level of the products.
5. The reaction below is an endothermic reaction.
2Hgo (s) 2Hg +O2 (g)
a. Rewrite this reaction and add energy" in the correct location
b. Describe how the energy level of the reactants comporon to th

Answer 1

B. a combustion reaction involves a hydrocarbon burning with oxygen gas to produce water and carbon dioxide.
C. this is an endothermic reaction since ΔH would be positive.
3.  I am pretty sure it is referring to the activation energy which is a characteristic all chemical reaction have and in a combustion reaction the spark gets the reaction over the activation energy.
4.  K₂O(s)+CO₂(g)⇒K₂CO₃(s)+energy
The energy level of the reactants is higher than the energy level of the products (you can see this with energy diagrams).

5. 2HgO(s)+energy⇒2Hg(l)+O₂(g)
the energy levels of the products is higher than the energy level of the reactants. (this can also be seen with energy diagrams)