Answer:
See explanation for solution
Explanation:
Mass fraction × 100= percent
Mass fraction of Nitrogen = 78/100= 0.78
Mass fraction of Oxygen= 20/100= 0.20
Mass fraction of Water vapour = 2/100=0.02
Answer:
Energy was released
Explanation:
Decrease in temperature means less energy, but the energy had to have been transferred because energy can't be destroyed or created. So if the temp. went down, energy must have been lost. (If it had been absorbed, the temp. would have gone up)
Answer:
This is a change in an objects motion caused by an unbalanced force.
- Acceleration
Answer:
my school is learning about this and we had these for a pratice regent purple=molarity
green=molality
Explanation:
Answer:
Hydrogen bonding
Step-by-step explanation:
The O-H bonds in water are highly polar.
There is an especially strong type of dipole-dipole attraction between the partially positive H atom in one molecule and the partially negative O atom on a nearby molecule.
We call this type of intermolecular force hydrogen bonding.
The strong attractive forces mean that we must supply extra energy to separate the molecules from each other.
Water therefore has an <em>unusually high boiling point
.</em>