8 The equation for the complete combustion of propan-1-ol is shown.
CH3CH2CH2OH(1) + 42O2(g)
→ 3C02(g) + 4H2O(1)
Standard enthalpy changes of formation are given.
H2O(1)
compound
AH
CH3CH2CH2OH(1)
-303 kJ mol?
CO2(g)
-394 kJ molt
-286 kJ mor?
What is the standard enthalpy change of combustion of propan-1-ol, in kJ mol"?
A
-394 - 286 - 303
B
303 - (4 x 286) - (3 x 394)
C 394 + 286 – 303
D
(3 x 394) + (4 x 286) + 303
9
In the treatment of domestic water supplies, chlorine is added to the water to form HCIO.

1.) which of the following is a molecule but not a compound? a.he b.f2 c.h2o d.ch4 2.) what is a physical combination of substances? a.a compound b.a molecule c.a mixture d.an element 3.) what is a chemical combination of substances? a.a compound b.an atom c.a mixture d.an element 4.) what is the relationship between the solute and solvent in a solution? a.they form a compound b.they form a mixture c.they form molecules d.they form chemical bonds 5.) the gases in air dissolve in water. what would be one way to reduce the amount of a gas dissolved in water? a.add more water b.reduce the air pressure c.increase the air pressure d.stir the water 6.) how would you determine the solubility of a substance? a.find how well it dissolved various substances. b.find the mass and the volume of the substance. c.find the temperature at which the substance evaporated. d.find how much i was able to dissolve in a solute. 7.) the periodic table organizes all of the kinds of a.molecules. b.compounds. c.atoms. d.ions. 8.)what distinguishes two substances combined to become a compound vs. two substances combined to become a mixture? a.whether they can be easily separated b.whether they chemically bond together c.whether they both are visible d.whether they are heterogeneous 9.) the principle components of air are: n2 78% o2 21% ar 0.95% co2 0.038% this is a solution of a.molecules and atoms. b.molecules. c.compounds and molecules. d.atoms.