When you drop iodine on a leaf you may observe a colour change of orange/brown to a blue/black complex.
This is because in the leaf there are starch molecules that form a blue/black complex with the starch molecules.
hope that helps :)
<span>1.304 x 10^7! Hope this helped.</span>
a) C₂H₄ (g) + 2Cl₂ → C₂H₂Cl₄ (l) + H₂ (g), ΔH°rxn = -385.76 kJ
ΔH°rxn = ∑ΔH°f (products) - ∑ΔH°f (reactants)
ΔH°rxn = [ΔH°f (C₂H₂Cl₄) + ΔH°f (H₂)] - [ΔH°f (C₂H₄) + 2ΔH°f (Cl₂)]
-385.76 = [ΔH°f (C₂H₂Cl₄) + 0] - [ 52.3 + 2 (0) ]
ΔH°f (C₂H₂Cl₄) = -385.76 + 52.3 = -333.46 kJ /mol
For second reaction:
C₂H₂Cl₄ (l) → C₂HCl₃ (l) + HCl (g)
ΔH°rxn = ΔH°f (C₂HCl₃ ) + ΔH°f (HCl) - ΔH°f (C₂H₂Cl₄)
= -276.2 + (-92.3) -(-333.46)
ΔH°rxn = -35.04 kJ/mol
b) C₂H₄ (g) + 2Cl₂ (g) → C₂HCl₃ (l) + H₂ (g) + HCl (g)
standard heat of reaction = ΔH°₁+ ΔH°₂
= -385.76 - 35.04 = -420.8 kJ/mol
c) Q = ΔH = -420.8 kJ/mol × 307 mol/hr = -129185 kJ/hr of heat evolved.
Answer:
A. The Sun makes energy on the inside.
Explanation:
The Sun makes its own energy by the the process called Nuclear fusion. When two or more atomic nuclei fuse together to create different atomic nuclei the process is called Nuclear fusion. In Sun the hydrogen atoms are fused together to create helium.This releases the lot of energy.
71-mL density=gram/mass
-55mL =86g/16mL
=16m-L =5.38g/mL
